Source: https://patents.google.com/patent/KR101506377B1/en
Timestamp: 2019-12-14 14:39:16
Document Index: 529589604

Matched Legal Cases: ['Application No. 60', 'Application No. 11', 'Application No. 11', 'Application No. 4', 'Application No. 5', 'Application No. 6', 'Application No. 4', 'Application No. 5', 'art 23', 'art 23', 'Application No. 5', 'Application No. 5', 'Application No. 2005', 'Application No. 6']

KR101506377B1 - Electrode protection in both aqueous and non―aqueous electrochemical cells, including rechargeable lithium batteries - Google Patents
Electrode protection in both aqueous and non―aqueous electrochemical cells, including rechargeable lithium batteries Download PDF
KR101506377B1
KR101506377B1 KR1020127007319A KR20127007319A KR101506377B1 KR 101506377 B1 KR101506377 B1 KR 101506377B1 KR 1020127007319 A KR1020127007319 A KR 1020127007319A KR 20127007319 A KR20127007319 A KR 20127007319A KR 101506377 B1 KR101506377 B1 KR 101506377B1
KR1020127007319A
KR20120032051A (en
죤 아피니토
유리 브이. 미카일리크
요르단 엠. 게로노브
크리스토퍼 제이. 시언
시온 파워 코퍼레이션
2006-03-22 Priority to US78576806P priority Critical
2006-03-22 Priority to US60/785,768 priority
2006-04-06 Priority to US11/400,781 priority
2006-04-06 Priority to US11/400,781 priority patent/US20070221265A1/en
2006-04-06 Priority to US11/400,025 priority
2006-04-06 Priority to US11/400,025 priority patent/US7771870B2/en
2007-03-21 Application filed by 시온 파워 코퍼레이션 filed Critical 시온 파워 코퍼레이션
2007-03-21 Priority to PCT/US2007/007005 priority patent/WO2007111901A2/en
2012-04-04 Publication of KR20120032051A publication Critical patent/KR20120032051A/en
2015-03-27 Publication of KR101506377B1 publication Critical patent/KR101506377B1/en
Electrode protection in electrochemical cells, and more particularly, electrode protection in both aqueous and non-aqueous electrochemical cells, including rechargeable lithium cells, is provided. Rechargeable batteries including lithium anodes for use in water and / or air environments as well as non-aqueous and non-air environments are also described. In one embodiment, the electrochemical cell comprises an anode comprising lithium and a multi-layer structure located between the anode and the electrolyte of the cell. The multi-layer structure includes at least one first layer of a single-ion conductive material (e.g., a lithiated metal layer) and at least one first polymer layer positioned between the anode and the single-ion conductive material . The present invention can also provide an electrode stabilization layer located within the electrode, i. E., Between one portion and another portion, of the electrode, to control consumption and re-plating of the electrode material during charging and discharging of the cell. Advantageously, an electrochemical cell comprising a combination of the structures described herein is not only suitable in an environment that is generally unsuitable for lithium, but also has a long cycle life, high lithium cycling efficiency, and high energy density .
ELECTRODE PROTECTION IN BOTH AQUEOUS AND NON-AQUEOUS ELECTROCHEMICAL CELLS, INCLUDING RECHARGEABLE LITHIUM BATTERIES IN AQUEOUS AND NON-AQUEOUS ELECTROCHEMICAL BATTERIES,
This application claims the benefit of US Provisional Application No. 60 / 785,768 entitled " Lithium / Water, Lithium / Air Battery ", filed March 22, 2006, filed on April 6, 2006, U.S. Patent Application No. 11 / 400,025 entitled " Electrode Protection in Non-aqueous Electrochemical Cells ", and U.S. Patent Application No. 11 / 400,025 entitled " Rechargeable Lithium / Water, Lithium / Claim 11 / 400,781.
The present invention relates to electrode protection in electrochemical cells, and more particularly to electrode protection in aqueous and non-aqueous electrochemical cells comprising a rechargeable lithium battery. The present invention also relates to a rechargeable electrochemical cell comprising a lithium anode for use in a water and / or air environment.
Recently, a great deal of attention has been focused on the development of a high energy density battery having a lithium-containing anode. The lithium metal can be, for example, an anode such as a lithium-doped carbon anode, where the presence of a non-electroactive material increases the weight and volume of the anode thereby reducing the energy density of the cell, Have attracted particular interest as anodes in electrochemical cells due to their very light weight and high energy density, as compared to other electrochemical systems with nickel or cadmium electrodes. Lithium metal anodes, or anodes predominantly comprising lithium metal, provide an opportunity to make cells lighter in weight and having a higher energy density than batteries such as lithium-ion, nickel metal blends or nickel-cadmium batteries. This feature is highly desirable for batteries for portable electronic devices, such as portable telephones and portable computers, where a premium is paid for low weight. Unfortunately, the reaction of lithium and its associated cycle life, dendrite formation, electrolyte compromise, fibrosis, and safety issues hinder the commercialization of lithium batteries.
Lithium battery systems generally include cathodes that are electrochemically lithiated during discharge. In this process, the lithium metal is converted to lithium ions, and is transported through the electrolyte to the cathode of the cell where it is reduced. In lithium / sulfur batteries, lithium ions form one of various lithium sulfur compounds at the cathode. At the time of charging, the above process is reversed so that the lithium metal is plated from the lithium ion of the electrolyte at the anode. In each discharge cycle, a significant number (e.g., 15-30%) of the available Li can be electrochemically dissolved in the electrolyte, and almost this amount can be re-plated at the anode upon charging. Typically, as compared to the amount removed during each discharge, somewhat less lithium is re-plated at the anode per charge; Small fragments of metallic Li anodes are typically reduced to species insoluble and electrochemically inactive during each charge-discharge cycle.
This process can press the anode in various ways, leading to an early lack of Li and a reduction in battery cycle life. During such a cycle, the Li anode surface can be roughened (the field-driven corrosion rate can increase) and the Li surface roughness can increase in proportion to the current density. Many inactive reaction products related to overall Li loss from the anode during the cycle may also accumulate on increasingly coarse Li surface and may interfere with charge traveling to the underlying metal Li anode. Without any other decomposition process in other parts of the cell, the Li anode loss per cycle ultimately makes the cell inactive. Accordingly, it is desirable to minimize or suppress the Li loss reaction, minimize the Li surface roughness / corrosion ratio, and prevent any inert corrosion reaction product from interfering with the charge transfer across the Li anode surface. At a particularly high current density (commercially desirable), this process can cause the battery to wear out more quickly.
Separation of the lithium anode and the electrolyte of a rechargeable lithium battery or other electrochemical cell may be desirable for a variety of reasons, including the disruption of the formation of the dendrites during the discharge, the reaction of the electrolyte with lithium, and the cycle life . For example, the reaction of the lithium anode with the electrolyte can be attributed to the formation of a resistive film cell on the anode, which can increase the internal resistance of the cell and reduce the amount of current that can be supplied by the cell at rated voltage. Many other solutions have been proposed for the protection of lithium anodes in such devices, including coating the lithium anode with an interface or protective layer formed of a polymer, ceramic, or glass, and an important feature of such an interface or protective layer is lithium Ions. For example, U.S. Patent Nos. 5,460,905 and 5,462,566 to Skotheim describe membranes of n-doped conjugation polymers intercalated between an alkali metal anode and an electrolyte. U.S. Pat. No. 5,648,187 to Skotheim and U.S. Pat. No. 5,961,672 to Skotheim et al. Describe an electrically conductive crosslinked polymeric membrane interposed between a lithium anode and an electrolyte, and a process for their preparation, wherein the crosslinked polymeric membrane comprises lithium Ion can be delivered). U.S. Patent No. 5,314,765 to Bate describes a thin layer of a lithium ion conductive ceramic coating between the anode and the electrolyte. Examples of an interfacial film for an anode comprising lithium are described, for example, in U.S. Patent Nos. 5,387,497 and 5,487,959 to Koksbang; U.S. Patent Application No. 4,917,975 to De Jonghe et al .; U. S. Patent No. 5,434, 021 to Fauteux et al .; And U.S. Patent Application No. 5,824,434 to Kawakami et al.
A single protective layer of an alkali ion conductive glass or amorphous material for an alkali metal anode (e.g., a lithium anode in a lithium-sulfur battery) is disclosed in U.S. Patent Application No. 6,02,094 to Visco et al. Lt; / RTI &gt;
Especially in rechargeable electrodes, such protective coatings present a special challenge, as various techniques and ingredients for the protection of lithium and other alkali metal anodes are known. Since the lithium battery operates by the removal and re-plating of lithium from the lithium anode every charge / discharge cycle, lithium ions must pass through any protective coating. The coating should also be able to withstand morphological changes since the material is removed from the anode and re-plated.
Rechargeable (secondary) lithium cells are associated with the use of aqueous electrolytes to present particular challenges. Water, and hydrogen ions, in particular, react with lithium. Such devices that are successful in achieving long cycle life will require very good protection of the lithium anode.
Despite the various approaches proposed in forming the lithium anode and forming the guard and / or the protective layer, there is a need for an improvement to the lithium anode designed for use in aqueous and / or air environments.
Electrode protection in electrochemical cells, and more particularly electrode protection in both aqueous and non-aqueous electrochemical cells, including rechargeable lithium cells, is proposed.
In one aspect, a series of electrochemical cells is provided. In one embodiment, an electrochemical cell comprises an electrode comprising a base electrode material comprising an electroactive species consumed and re-plated, respectively, during discharge and charging of the electrode. The electrode comprises a first layer comprising an electroactive species, a second layer comprising an electroactive species, and a second layer comprising a first layer and a second layer, wherein the first layer and the second layer are separated from each other and the electrical conduction state between the first and second layers is substantially Lt; / RTI &gt; conductive layer. The second layer is positioned between the first layer and the electrolyte used in the cell.
In yet another embodiment, the electrochemical cell comprises a base electrode material comprising lithium, a single-ion conductive material, a polymeric layer between the base electrode material and the single-ion conductive material, and a separating layer between the base electrode material and the polymeric layer And an anode. Such an embodiment may comprise an aqueous electrolyte in the electrochemical delivery state of the anode. In some cases, the electrochemical cell may comprise a multi-layered protection structure on the anode, comprising a plurality of layers of a single-ion conductive material (each thickness is 10 microns or less) and a plurality of polymer layers, The polymer layer is interposed between the single-ion conductive material layers. At least a portion of the multi-layered ion-conducting material may comprise voids that are at least partially filled with an auxiliary migration-inhibiting material. In some cases, at least one of the plurality of single-ion conductive material layers comprises a metal layer. In other cases, each of the plurality of single-ion conductive material layers includes a metal layer. The separation layer may be, for example, a plasma-treated layer.
In another embodiment, the above-described electrochemical cell comprises a first layer comprising lithium, a second layer comprising lithium, a second layer comprising lithium on the inserted single-ion conductive, non-electrically conductive layer, Layer, wherein the second layer is positioned between the first layer and the electrolyte. The cell may further comprise a current collector in the electron transfer state of both the first layer and the second layer. In some cases, the first and second layers may be confined to a layered structure having at least one edge, and the current collector is brought into contact with the edge of the anode across both the first and second layers.
In yet another embodiment, an electrochemical cell comprises an anode comprising a base electrode material comprising lithium, and a multi-layer structure positioned between the anode and the electrolyte of the cell. The multi-layer structure comprises at least two first layers, each of which is a single-ion conductive material, at least two second layers, each being a polymeric material, wherein at least two first layers and at least two second layers Are arranged in alternating order with respect to each other, and each layer of the multi-layer structure has a maximum thickness of 25 microns. The multi-layer structure may include at least four layers, each of which is a single-ion conductive material, and at least four second layers, each of which is a polymeric material, arranged in alternating order with respect to each other. In another embodiment, the multi-layer structure comprises at least five layers, each of which is a single-ion conductive material, and at least five second layers, each of which is a polymeric material, arranged in alternating order with respect to each other. In another embodiment, the multi-layer structure comprises at least six layers, each of which is a single-ion conductive material, and at least six second layers, each of which is a polymeric material, arranged in alternating order with respect to each other. In another embodiment, the multi-layer structure comprises at least seven layers, each of which is a single-ion conductive material, and at least seven second layers, each of which is a polymeric material, arranged in alternating order with respect to each other. The maximum total thickness of the multi-layer structure is, for example, 300 microns, 250 microns, 200 microns, 150 microns, 100 microns, 75 microns, or 50 microns.
In some embodiments, at least a portion of the multi-layered ion-conducting material comprises voids that are at least partially filled with an auxiliary migration-inhibiting material. The maximum thickness of each layer of the multi-layer structure may be 10 microns.
In another embodiment, an electrochemical cell includes an anode comprising a base electrode material comprising lithium, a single-ion conductive material, a polymer layer between the base electrode material and the single-ion conductive material, a polymer layer between the base electrode material and the polymer layer A separating layer, and an aqueous electrolyte in an electrochemical delivery state of the anode. In yet another aspect, a series of methods of electrical energy storage and utilization are provided. In one embodiment, the method comprises providing an electrochemical cell comprising an electrode comprising a base electrode material comprising an electroactive species consumed or re-plated, respectively, during discharge and charging of the electrode, The electrode comprises a first layer comprising an electroactive species, a second layer comprising an electroactive species, a first layer separating the first and second layers, and an electron transfer between the first and second layers passing through the single- Ion conductive layer, wherein the second layer is positioned between the first layer and the electrolyte used in the cell. The method also includes alternately discharging current from the device to define the at least partially discharged device, and at least partially charging the at least partially discharged device to define the at least partially recharged device Wherein the base electrode material from the first layer is consumed during discharging to a greater extent than re-plated upon filling and the base electrode material extends from the second layer past the single-ion conductive, non-electrically conductive layer And is refilled with the first layer.
In another embodiment, the method includes providing an electrochemical cell comprising an anode, cathode, and an aqueous electrolyte in an electrochemical delivery state of an anode and a cathode with lithium as an active anode material, and discharging the cell alternately And circulating the battery at least three times while charging, wherein at the end of the third cycle the cell represents at least 80% of the initial capacity of the cell.
In some cases, the method comprises cycling at least five cells while alternately discharging and charging the cells wherein at the end of the fifth cycle, the cells represent at least 80% of the initial capacity of the cells. In yet another embodiment, the method comprises cycling at least 10 cells while alternately discharging and charging the cells, wherein at the end of the tenth cycle, the cells represent at least 80% of the initial capacity of the cells. In another embodiment, the method comprises cycling at least fifteen cells while alternately discharging and charging the cells, wherein at the end of the fifteenth cycle the cells represent at least 80% of the initial capacity of the cell. In yet another embodiment, the method comprises cycling at least 25 cells while alternately discharging and charging the cells, and at the end of the 25th cycle, the cells represent at least 80% of the initial capacity of the cells. In yet another embodiment, the method comprises cycling at least 50 cells while alternately discharging and charging the cells, and at the end of the 50 &lt; th &gt; cycle, the cells represent at least 80% of the initial capacity of the cell. In another embodiment, the method comprises cycling at least 75 cells while alternately discharging and charging the cells, and at the end of the 75th cycle, the cells represent at least 80% of the initial capacity of the cell. In yet another embodiment, the method comprises cycling at least 100 cells while alternately discharging and charging the cells, wherein at the end of the 100th cycle, the cells represent at least 80% of the initial capacity of the cell. In another embodiment, the method comprises cycling at least 150 cells while alternately discharging and charging the cells, wherein at the end of the 150th cycle, the cells represent at least 80% of the initial capacity of the cell. In another embodiment, the method comprises cycling at least 250 cells while alternately discharging and charging the cells, and at the end of the 250th cycle, the cells represent at least 80% of the initial capacity of the cells.
Other advantages and novel features of the present invention will become apparent from the following detailed description of various non-limiting embodiments of the invention taken in conjunction with the accompanying drawings. If the merged documents in this specification and references include confusing and / or inconsistent content, the present specification may be modified. If two or more documents merged into a reference include confusing and / or inconsistent content, the document with a later expiration date should be adjusted.
Non-limiting embodiments of the present invention will be described in an exemplary manner with reference to the accompanying drawings, which are schematic and are not intended to be drawn to scale. In the drawings, each of the same or similar elements shown is typically represented by a single number. For clarity, not all elements are numbered in all figures, and so are all elements of each embodiment of the present invention shown to avoid needing explanation, in order to allow those skilled in the art to understand the invention.
1 is a diagram illustrating a structure for use in an electrochemical cell, including a single-ion conductive layer and a polymer layer, in accordance with an embodiment of the present invention.
2 is a diagram illustrating a structure for use in an electrochemical cell, including various multi-layer structures, in accordance with an embodiment of the present invention.
Figure 3 is a diagram illustrating the structure used in an electrochemical cell, including an intercalation layer, in accordance with an embodiment of the present invention.
Figure 4 illustrates a structure for use in an electrochemical cell, including an intercalation layer comprising a multi-layer structure, in accordance with an embodiment of the present invention.
5 is a SEM image of a Li anode surface after a tenth discharge according to an embodiment of the present invention.
Figure 6 is a schematic illustration of an embodiment that increases the barrier to species passages.
Figure 7 illustrates a structure for use in an electrochemical cell comprising several multi-layer structures, an intercalation layer, and a separation layer, in accordance with an embodiment of the present invention.
8A to 8C are SEM images of various Li anode surfaces after a first discharge, according to an embodiment of the present invention.
The present invention relates to electrode protection in electrochemical cells, and more particularly to electrode protection in aqueous and non-aqueous electrochemical cells comprising a rechargeable lithium battery. The present invention also relates to a rechargeable battery comprising an alkali metal anode for use in a water and / or air environment. In most of the embodiments described herein, a lithium rechargeable battery (including a lithium anode) is described. However, it is to be understood that whatever lithium battery is described herein, any similar alkali metal cell (alkali metal anode) may be used. Moreover, although rechargeable electricity is primarily described herein, non-rechargeable (primary) batteries are likewise intended to be advantageous from the present invention. Furthermore, although the present invention is particularly useful for providing anode protection so that a high-cycle life rechargeable battery (a battery using a water-based electrolyte) can be obtained, the present invention is also applicable to non-aqueous electrolyte batteries It is possible.
The present invention provides techniques and elements for excellent protection and / or maintenance of electrodes (particularly lithium anodes) in rechargeable batteries and other batteries. The elements of the present invention provide, at least, one or more of the following features: (1) from one or more components of the electrolyte (which reduces cycle life) that react with the electrodes and / or the entire device, (2) dissolution of the anode material into the electrolyte (for example, reduction of lithium to lithium ion), and re-plating of the electrode material from the electrolyte (for example, lithium metal of lithium ions) (I. E., Oxidation of the electrolyte) to the electrolyte (e. G., Lithium ions) and / or (3) blocking the undesirable component pathway from the electrolyte to the electrode, Excellent conditioning.
In one embodiment, the electrochemical cell of the present invention comprises an anode comprising lithium and a multi-layer structure positioned between the anode and the electrolyte of the cell. In one particular embodiment, which provides excellent interactions between the multi-layer structure and the electrodes, the multi-layer structure includes at least one layer of a first single-ion conductive material (e.g., a lithium metal layer) And at least one first polymer layer disposed between the ionically conductive materials. In such an embodiment, the multi-layer structure may comprise several sets of alternating single-ion conductive material layers and polymer layers. The multi-layer structure allows the passage of lithium ions while limiting the passage of certain chemical species (e.g., water) that can adversely affect the anode. The cell may also include a separation layer (e.g., a plasma-treated layer) positioned between the anode and the multi-layer structure. Such a separation layer may serve as a temporary or permanent protective layer, for example to stabilize the consumption and / or re-plating of lithium through the surface of the anode.
As mentioned in the embodiment described above, the lithium electrode with or without a separation layer is first directly addressed by the polymer layer. A layer of a single-ion conductive material is provided on the side of the polymer layer facing the surface of the electrode. Additional layers may be provided. This arrangement can provide significant advantages when a flexible polymer is chosen for the system where flexibility is most needed, i.e. the surface of the electrode where morphological changes occur during charging and discharging. In certain embodiments, the polymer provides a cell that is particularly bendable / easy or resilient (not broken), particularly durable, durable and rechargeable. The polymer in such an arrangement may have at least one of the following properties, or any combination of these properties: a Shore A hardness of less than 100, less than 80, less than 60, less than 40, or less than 20 (Or a Shore A hardness of 0 to 10, 10 to 20, 20 to 30, 30 to 40, 40 to 50, 50 to 60, 60 to 70, 70 to 80, 80 to 90, 90 to 100) D hardness of less than 100, less than 80, less than 60, less than 40, or less than 20 (or Shore D hardness of 0 to 10, 10 to 20, 20 to 30, 30 to 40, 40 to 50, 50 to 60, To 70, 70 to 80, 80 to 90, 90 to 100); A Young's modulus of less than 10 GPa, less than 5 GPa, less than 3 GPa, less than 1 GPa, less than 0.1 GPa, or less than 0.01 GPa (or a Young's modulus of 0.01 to 0.1 GPa, 0.1 to 1 GPa, 1 to 2.5 GPa, 2.5 To 5 GPa); Fracture toughness greater than 0.1 MN / m 3/2 , greater than 0.5 MN / m 3/2 , greater than 1.0 MN / m 3/2 , greater than 2.0 MN / m 3/2 , 3.0 MN / m 3 / 2 , greater than 5 MN / m3 / 2 (measured at room temperature and atmospheric pressure, for example). Suitable polymers may also have a glass transition temperature (T g ), melting point (T m ), strength (e.g., tensile, flexure, and yield strength), elongation, plasticity, and hardness {e.g., Shore A or Shore D hardness meter, or Rockwell hardness test), as described herein, for example, in accordance with the teachings herein. This arrangement, including a consumable / re-plating electrode, a polymeric protective layer and a single-ion conductive layer, as a sub-combination of the entire protective structure or the entire cell adds significant advantages. In this arrangement and in other arrangements, the single-ion conductive layer can be selected from those commonly known in the art, including those described herein and including free, lithium metal layers, and the like.
Most single thin film materials have the requisite properties, i.e., passing Li ions, allowing a significant amount of the Li surface to participate in current conduction when they are deposited on the surface of the Li anode, For example, protecting the metal Li anode from a liquid electrolyte and / or a polysulfide generated from a sulfur-based cathode, and not interfering with surface damage causing high current densities. The present inventors have discovered that the use of a multi-layered anode stabilization layer (electrode stabilization), an embedded Li layer (e.g., a first Li layer, a Li conductive and electron blocking layer, and a second Li layer And a separation layer (e. G., A plasma treated layer). &Lt; / RTI &gt;
Figure 1 shows an example of the electrode protection arrangement of the present invention illustrated as a multi-layer anode stabilizing layer structure. In the embodiment illustrated in FIG. 1, the structure 10 includes an anode 20 comprising a base electrode material (for example lithium), and a multi-layer structure 22 covered by an anode. In some cases, the anode is referred to as an " anode-based material ", "anode active material ", and the like with any protection structure collectively referred to as an " anode " All such representations should be understood to form part of the present invention. In this particular embodiment, the multi-layer structure 22 includes a single-ion conductive material 50, a polymer layer 40 positioned between the base electrode material and the single-ion conductive material, (E. G., A layer resulting from the plasma treatment of the electrode). &Lt; / RTI &gt; The multi-layer structure may allow the passage of lithium ions and may interfere with the passage of other components that can damage the anode. Advantageously, as will be discussed in more detail below, the multi-layer structure can reduce the number of defects, thereby allowing a large amount of Li surface to participate in current conduction, Prevent damage, and / or serve as effective barriers to protect the anode from certain species (e.g., electrolytes and / or polysulfides).
The anode 20 may comprise a base electrode material such as lithium metal, which may serve as an anode active material. The lithium metal may be in the form of a lithium metal foil or a lithium thin film deposited, for example, on a substrate, as described below. The lithium metal may also be in the form of a lithium alloy, for example a lithium-tin alloy or a lithium aluminum alloy.
In these and other embodiments, the thickness of the anode can vary, for example from about 2 to 200 microns. For example, the thickness of the anode may be less than 200 microns, less than 100 microns, less than 50 microns, less than 25 microns, less than 10 microns, or less than 5 microns. The choice of thickness can vary depending on battery design parameters such as the desired excess lithium, cycle life, and thickness of the cathode electrode. In one embodiment, the thickness of the anode active layer is in the range of about 2 to 100 microns. In another embodiment, the thickness of the anode ranges from about 5 to 50 microns. In another embodiment, the thickness of the anode ranges from about 5 to 25 microns. In yet another embodiment, the thickness of the anode ranges from about 10 to 25 microns.
The device shown in Fig. 1 may further comprise a substrate on the surface of the anode facing the multi-layer structure surface, as is known in the art. The substrate is useful as a support for depositing the anode active material and can provide additional stability in processing the lithium thin film in the process of manufacturing the battery. Moreover, in the case of a conductive substrate, the substrate can also act as a current collector, which is useful for efficiently collecting electrical currents generated through the anode and providing an efficient surface for attachment of electrical contacts through which external circuitry is accessible. A wide range of substrates are known in the prior art for the anode. A suitable substrate comprises a metal foil, a polymeric film, a metallized polymeric film, an electrically conductive polymeric film, a polymeric film having an electrically conductive coating, an electrically conductive polymeric film having an electrically conductive metal coating, and a polymeric film having the conductive particles dispersed therein But are not limited to, those selected from the group. In one embodiment, the substrate is a metallized polymer film. In another embodiment, the substrate may be selected from a non-electro-conductive material, as described in more detail below.
The layers of the anode structure 10 of the present invention may be deposited by any of a variety of conventionally known methods, such as physical or chemical vapor deposition processes, extrusion and electroplating. Examples of suitable physical or chemical vapor deposition processes include but are not limited to thermal evaporation (including but not limited to resistance, induction, radiation and electron beam heating), sputtering (diode, DC magnetron, RF, RF magnetron, pulse, dual magnetron, Plasma enhanced chemical vapor deposition, laser enhanced chemical vapor deposition, ion plating, cathodic arc, jet vapor deposition, and laser ablation, including but not limited to AC, MF, and reactivity, But is not limited thereto.
Deposition of the layer may be performed in a vacuum or an inert atmosphere to minimize impurities in the deposited layer that may impregnate the impurity into the layer or affect the desired shape of the layer. In some embodiments, the anode active layer and the multi-layer structure layer are deposited in a continuous manner in a multi-stage deposition apparatus.
In particular, methods of depositing the anode 20 on a substrate (e.g., in the case of an alkali metal anode such as lithium) include methods such as thermal evaporation, sputtering, jet vapor deposition, and laser ablation. Alternatively, where the anode comprises a lithium foil, or a lithium foil and a substrate, they may be laminated together by a conventionally known deposition method to form the anode layer.
In some embodiments, the single-ion conductive material is a non-polymer. For example, in certain embodiments, the single-ion conductive material 50 is partially or entirely defined by a metal layer that is highly conductive to lithium and electrically conductive to lithium. For example, a single-ion conductive material may be selected to allow both lithium ions and electrons to pass through the layer. The metal layer may comprise a metal alloy layer, for example a layer of lithium metal, especially where a lithium anode is used. The lithium content of the metal alloy layer may vary from about 0.5 wt% to about 20 wt%, depending on the particular choice of metal, desired lithium ion conductivity, and desired flexibility of the metal alloy layer, for example. Suitable metals for use in the single-ion conductive material include but are not limited to Al, Zn, Mg, Ag, Pb, Cd, Bi, Ga, In, Ge, Sb, As, and Sn. Occasionally, combinations of the metals listed above may be used for single-ion conductive materials.
In another embodiment, the single-ion conductive material 50 is partly or wholly defined by a layer that is highly conductive to lithium and least conductive to electrons. That is, the single-ion conductive material may be selected such that lithium ions do not allow electrons to pass through the layer. For example, the single-ion conductive material may include a ceramic layer, such as a single ion conductive glass, which is conductive to lithium ions. In certain embodiments, suitable glasses may be characterized as including, but not limited to, "modifying agent" and "network" The modifier may comprise a metal oxide of a metal ion that is conductive in the glass. The network portion may comprise a metal chalcogenide, such as, for example, a metal oxide or a sulfide. A single-ion conducting layer is a lithium nitride, a lithium silicate, a lithium borate, a lithium aluminate, a lithium phosphate, a lithium phosphorus oxynitride, a lithium silico sulfide, lithium germanosilicide sulfide, lithium oxide (e.g., Li 2 O, LiO, LiO 2 , LiRO 2 , where R is a rare earth metal), lithium lanthanum oxide, lithium titanium oxide, lithium borosulfide, lithium aluminosulfide, and lithium phosphosulfide, and combinations thereof. Layer. In one embodiment, the single-ion conductive layer comprises lithium phosphorous oxynitride in the form of an electrolyte. Electrolyte membranes of lithium phosphate oxynitride suitable for use as a single ionic conducting material 50 are disclosed, for example, in US Patent 5,569,520 to Bate. The choice of a single ionically conductive material depends on many factors, including, but not limited to, the properties of the electrolyte and cathode used in the cell.
For batteries used in water and / or air environments, such as rechargeable batteries with aqueous electrolytes, the single-ion conductive material can be configured to interfere with the passage of hydrogen ions (protons) through these layers . For example, during discharge, the protons may move relative to the electric field in a protective layer (e.g., a multi-layer structure) of the cell. However, during charging, the electric field can promote the passage of protons across the protective layer. Eventually, the protons may reach the Li anode layer and produce hydrogen gas or other species that, for example, may foam and cause delamination or other undesirable effects of the multi-layer structure. As discussed more fully below, the single-ion conductive layer can be combined with other materials to hinder the passage of hydrogen ions and / or electrons while permitting the passage of lithium ions (e.g., as a polymer Filled).
The thickness of the single-ion conductive material layer (e.g., within a multi-layer structure) may vary over a range of about 1 nm to about 10 microns. For example, the thickness of the single-ion conductive material layer is 1 to 10 nm, 10 to 100 nm, 100 to 1000 nm, 1 to 5 microns, or 5 to 10 microns. The thickness of the single-ion conductive material layer is, for example, 10 microns or less, 5 microns or less, 1000 nm or less, 500 nm or less, 250 nm or less, 100 nm or less, 50 nm or less, 25 nm or less, . In some cases, the thickness of the single-ion conductive layer is the same as the thickness of the polymer layer of the multi-layer structure.
The single-ion conductive layer may be deposited by any suitable method, such as sputtering, electron beam evaporation, vacuum thermal evaporation, laser ablation, chemical vapor deposition (CVD), thermal evaporation, plasma enhanced chemical vapor deposition (PECVD), laser enhanced chemical vapor deposition, May be deposited in any suitable manner. The technique used may vary depending on the type of material being deposited, the thickness of the layer, and the like.
In some embodiments, the single-ion conductive layer can be treated with a polymer such that pinholes and / or nanopores of the single-ion conductive layer can be filled with the polymer. Such an embodiment may be used to identify a particular species (e.g., a species) that faces the anode, such as by increasing the distance, or by tortuosity that needs to go through the entire multi-layer array to reach such a species anode The electrolyte and / or the polysulfide).
The thickness of the polymer layer (e.g., within a multi-layer structure) may vary over a range of about 0.1 micron to about 10 microns. For example, the thickness of the polymer layer may be from 0.1 to 1 micron, from 1 to 5 microns, or from 5 to 10 microns. The thickness of the polymer layer may be, for example, 10 microns or less, 5 microns or less, 2.5 microns or less, 1 micron or less, 0.5 microns or less, or 0.1 micron or less.
In some embodiments involving a multi-layer structure with more than one polymer layer, the thickness of the polymer layer may vary within the structure. For example, in some cases, the polymer layer closest to the anode layer (e.g., a Li reservoir) is thicker than the other polymer layers of the structure. For example, this embodiment can stabilize the anode by allowing lithium ions to be more uniformly plated across the surface of the anode during charging.
The polymer layer can be deposited by methods such as electron beam evaporation, vacuum thermal evaporation, laser ablation, chemical vapor deposition, thermal evaporation, plasma assisted chemical vapor deposition, laser enhanced chemical vapor deposition, jet vapor deposition, and extrusion. The polymer layer may also be deposited by spin-coating techniques. Methods of depositing a crosslinked polymer layer include, for example, a flash evaporation method as described in U. S. Patent Application No. 4,954,371 to Yializis. Methods for depositing a crosslinked polymer layer comprising a lithium salt can include, for example, a flash evaporation method as described in U.S. Patent Application No. 5,681,615 to Afftnito et al. The techniques used to deposit the polymer layer may vary depending on the type of material deposited, the thickness of the layer, and the like.
1, the protective structure that separates the anode 20 and the electrolyte 60 includes a polymer layer in contact with the anode (or isolation layer) 30. In one particular embodiment, as shown in FIG. In other arrangements, the polymer layer need not be the first layer in contact with the anode or isolation layer. Various arrangements of the invention including various multi-layer structures are described below, wherein the first layer in contact with the anode may or may not be a polymer. In any arrangement in which any particular arrangement of layers is shown, it should be understood that the alternation order of the species is within the scope of the present invention. Nevertheless, one aspect of the present invention involves the particular advantage realized by the nonbreakable polymer immediately adjacent to the anode or separation layer.
In some embodiments, the multi-layer structure protects the anode cell better than any of the individual layers contained therein. For example, it is most effective when individual layers of a multi-layer structure, such as a single-ion conductive layer, a polymer layer or a separating layer, may have desirable properties, but are complemented by other components having different properties at the same time . For example, a single-ion conductive layer, particularly a vacuum deposited single-ion conductive layer, may be flexible like a thin film, but may include bonds such as small holes and / or roughness when deposited as a thicker layer, It can be broken when dealing with it. The polymeric layer, and in particular the crosslinked polymeric layer, can, for example, provide a very smooth surface, add strength and flexibility, and can block electrons, but can also penetrate certain solvents and / have. Thus, they have examples of layers that can be complementary to each other in an improved protective structure as a whole.
Thus, in another embodiment, the present invention provides a multi-layer electrode stabilization, or a protection structure that provides more advantages over conventional electrode protection structures. Of the many descriptions herein, the structure is referred to as an "anode stabilized" structure, but it should be understood that the structure may be used for any electrode under suitable conditions understood by those skilled in the art, . The multi-layer electrode stabilization structure of the present invention, according to this embodiment, can be used to protect the electrode protection structure using a defect that may be inherent in the previous electrode protection structure, or a material the same or similar to that used in the electrode protection structure of the present invention So as to minimize the inherent defects. For example, the single ion conductive layer (or other components of the device described herein) may include small pores, gaps, and / or grain boundary defects. Once such a defect is formed, the defect can grow / spread over the entire thickness of the film as the film grows, and can become worse as the film becomes thicker. The defect structure in each single-ion conductive layer can be separated from the defect structure in all other single-ion conductive layers by separating the thin single-ion conductive layer from the thin, small pore-free and smooth polymer layer. Thus, at least one or more of the following advantages are realized in such a structure: (1) it is not easy to cause defects of one layer to align directly with defects of the other layer, Are substantially non-aligned with the defect; (2) any defect in one single-ion conductive layer is much smaller / smaller or much less deleterious than a defect in a thicker layer of similar or the same material. When alternating single-ion conductive layers and polymer layers are deposited on top of each other in a manufacturing step, each single-ion conductive layer has a smooth, small pore-free polymer layer as it grows. In contrast, if a single-ion conductive layer is deposited over another single-ion conductive layer (or if it is continuously deposited as a single, thicker layer), defects in the layer deposited over the underlying layer It can play a role of agitating to increase. That is, depending on whether the protective structure is assembled into a thicker single-ion conductive layer, or a multiple single-ion conductive layer on top of each other, the defect can spread through the thickness or from layer to layer as the structure grows , Which leads to a larger bond and a defect that spreads directly or substantially directly over the entire structure. In this arrangement, the single-ion conductive layer is also less likely to occur than when they are deposited directly on the coarser Li or electrolyte layer (especially when the arrangement of FIG. 1, where the first electrode stabilizing layer addressing the electrodes is a polymer layer, is used) There may be fewer defects. Thus, in such an arrangement, the ion-conducting layer can be made to have fewer defects as a whole, and the defects are not aligned with the defect closest to the other ion-conducting layers, where defects are typically larger, Or less harmful (less) than is present in a layer of the same or similar material deposited on top of each other.
The multi-layered electrode stabilization structure is particularly advantageous because it reduces the direct flow of species (e. G., Electrolytes and polysulfide species) into the Li anode (such species tend to diffuse through defects or open spaces in the layer) It can act as a barrier. As a result, dendritic crystal formation, self-discharge, and loss of cycle life can be reduced.
Another advantage of a multi-layer structure includes the mechanical properties of the structure. The location of the polymer layer in contact with the single-ion conductive layer can reduce the tendency of the single-ion conductive layer to break, and can increase the barrier properties of the structure. Thus, such a laminate may be more robust than a structure that does not interfere with the polymer layer, for stress due to processing during the fabrication process. Furthermore, the multi-layer structure also has increased resistance to volume changes involving migration of lithium back and forth from the anode during the discharge and charge cycles of the cell.
The ability to reach the anode of a particular species (e.g., an electrolyte and / or a polysulfide) that can damage the anode can also be achieved by providing a multi-layered, single-ion conductive layer and a repeating layer of the polymer layer Can be reduced. When encountering a defect-free portion of the paper single-ion conductive layer, movement of the species toward the anode is possible if the paper diffuses laterally through a very thin polymer layer to meet defects in the second single-ion conductive layer . As the number of pairs of single-ion conductive / polymer layers increases, the spreading ratio of the species becomes very small (e.g., the amount through the layer decreases) because the lateral diffusion through the ultra-thin layer is very slow. For example, in one embodiment, the permeability of a species that passes through a polymer / single-ion conductive / polymer three-layer structure may vary over only a single-ion conductive layer (e.g., Even if they have the same size). In another embodiment, the polymer / single-ion conductive / polymer / single-ion conductive / polymer five-layer structure has a size reduction of more than a fifth of the permeability of the species compared to the permeability of one single- . In contrast, the permeability of the same species through a double thick single-ion conductive layer can actually increase. This large decrease in the permeability of the harmful species through the electrode stabilization layer can increase as the number of layers increases (where the thickness of the individual layers decreases). The 10-layer structure in which the single-ion conductive layer and the polymer layer alternate with the same total thickness, as compared to the two-layer structure of the specific total thickness of the single-ion conductive layer and the polymer layer, Can be significantly reduced. The particular arrangement to be described below, and the principles involved in the increased barrier to passage of such species, are outlined in Fig. Due to the significant advantages realized by the electrode stabilization protection of the present invention, in certain protection structures, a smaller amount of material can be used compared to conventional structures. Thus, in a particular class of electrode protection required for a particular cell array, a much smaller amount of the total electrode stabilizing material can be applied, which greatly reduces the overall cell weight.
The multi-layer structure includes multiple polymer / single-ion conductive pairs as needed. Typically, the multi-layer structure may have n polymer / single-ion conductive pairs, where n may be determined based on a specific performance criterion for the cell. For example, n may be an integer greater than or equal to 1, or may be greater than or equal to 2, 3, 4, 5, 6, 7, 10, 15, 20, 40, 60, In some embodiments, the multi-layered structure comprises a polymer / single polymer having a multi-layer structure greater than 4, greater than 10, greater than 25, greater than 50, greater than 100, greater than 200, greater than 500, greater than 1000, greater than 2000, greater than 3000, greater than 5000, - ionic conductive pair. For example, in one particular embodiment, greater than 10,000 polymer / single-ion conductive pairs have been prepared.
Figure 2 shows an example of a multi-layered electrode stabilization structure comprising a multiple polymer and a single-ion conductive layer. 2, structure 11 includes an anode 20 comprising a base electrode material (e. G. Lithium), and a multi-layer structure (e. G. 24). The multi-layer structure includes at least two first layers, each being a single-ion conductive material, and at least two second layers, each being a polymeric material. For example, the multi-layer structure 24 includes polymer layers 40 and 42, and single-ion conductive layers 50 and 52. As shown in Figure 2, two layers of polymeric material and two layers of single-ion conductive material are arranged in alternating order with respect to each other. The structure 11 optionally includes a separation layer (e.g., a plasma-treated layer) between the base electrode material and a polymer layer (not shown in FIG. 2, as described in FIG. 1).
The structure 11 may also include additional multi-layer structures including polymer layers 44 and 46 and single-ion conductive layers 54 and 56, such as a multi-layer structure 26. The multi-layer structures 24 and 26 may be combined to form a multi-layer, or may be a multi-layer structure comprising four layers, each being a single-ion conductive material, and four layers each being a polymeric material, Layer structure. In other embodiments, the structure may include a different number of alternating single-ion conductive layers and polymer layers. For example, the multi-layer structure may comprise n first layers, each being a single-ion conductive material, and n second layers each being a polymeric material, in an alternating arrangement, where n is at least 2. For example, n may be at least 2, 3, 4, 5, 6 or 7, 10, 15, 20, 40, 60,
In another embodiment, the multi-layer structure may comprise a greater number of polymeric layers than the single-ion conductive layer, or more single-ionic conductive layers than the polymeric layer. For example, a multi-layer structure may include n polymer layers and (n + 1) single-ion conductive layers, or n single-ion conductive layers and (n + 1) polymer layers, where n is at least 2. For example, n may be 2, 3, 4, 5, 6, or 7, and so on. However, as described above, immediately adjacent to at least one polymer layer, and at least 50%, 70%, 90% or 95% of the ion-conducting layer, such a layer is immediately adjacent to the polymer layer in one aspect.
As mentioned, the multi-layer electrode stabilization structure can provide significant advantages, wherein a certain amount of material defining the structure is arranged in a thinner, and larger number of forms. In some embodiments, the maximum thickness of the individual layers of the multi-layer structure is less than 100 microns, less than 50 microns, less than 25 microns, less than 10 microns, less than 1 micron, less than 100 nanometers, less than 10 nanometers, Meter. Sometimes, the thickness of a single type of layer can be the same in a multi-layer structure. For example, the polymer layers 40 and 42 may have the same thickness in the multi-layer structure 24. In other embodiments, the thickness of a single type of layer may vary in a multi-layer structure, for example, the polymer layers 40 and 42 may have different thicknesses in the multi-layer structure 24. [ The thickness of the other types of layers in the multi-layer structure may be the same or different in some cases. For example, the thickness of the polymer layers 40 and 42 may be different from the thickness of the single-ion conductive layers 50 and 52. One of ordinary skill in the art can select the material and thickness of a suitable layer in combination with the description herein.
The multi-layer structure may have various overall thicknesses, for example, depending on the particular use of the electrolyte, cathode, or electrochemical cell. In some cases, the total thickness of the multi-layer structure is less than 1 cm, less than 5 mm, less than 1 mm, less than 700 microns, less than 300 microns, less than 250 microns, less than 200 microns, less than 150 microns, less than 100 microns, less than 75 microns Or less, and 50 microns or less. It may also be desirable to have a multi-layer structure with a certain thickness with a certain number of polymer / single-ion conductive layer pairs. For example, in one embodiment, the thickness of the multi-layer structure may be less than 1 mm and may include more than ten polymer / single-ion conductive material pairs. In other embodiments, the thickness of the multi-layer structure may be less than 0.5 mm and may include more than 50 polymer / single-ion conductive material pairs. As described herein, it should be understood that various embodiments are provided by the present invention, including certain combinations of total electrode stabilization thickness, individual layer thickness, number of individual layers, and the like.
As noted, the multi-layer structure can protect the anode by reducing water and / or oxygen passing through the layer. For example, a typical PVD oxide coating having a thickness of several hundred angstroms on a PET surface with a thickness of 12 microns can reduce water and / or oxygen permeability by 30-40 times compared to a surface without a PVD oxide coating. Owing to the typical 1 micron thick acrylate coating on the PET surface with a thickness of 12 [mu] m (and subsequently polymerized coated monomers), the water and / or oxygen permeability is reduced. However, attaching the acrylate coating on the oxide layer of the PET / oxide structure reduces the water and / or oxygen permeability by a factor of 10 to 20 times. Two polymer / oxide pairs can reduce water and / or oxygen permeability by more than 100 times, while five pairs can reduce oxygen permeability by more than five orders of magnitude. Thus, an electrochemical cell comprising a multilayer structure is well suited for use in water and / or oxygen or air environments.
Another embodiment of the present invention includes an interlevel layer (e.g., a single-ion conductive material) positioned between two base electrode material layers. This layer is referred to as a "lamanode" structure. 3 illustrates a second layer 22 comprising a first layer of a base electrode material (e.g., lithium, also referred to as a Li reservoir), an intercalation layer 70, and a base electrode material (a working Li layer) Lt; RTI ID = 0.0 &gt; (20). &Lt; / RTI &gt; As described in the embodiment shown in FIG. 3, the second layer is located between the anode 20 and the electrolyte 60. The second layer can be in direct contact with the electrolyte, or indirectly with the electrolyte, or with the electrolyte through some form of surface layer (e. G., Electrode stabilization structure, such as those described herein) . The function of the two-layer anode structure in which the individual anode portions are separated by the inserting layer 70 will become apparent from the following. It should be noted that although the layer 70 is described and described herein as "embedded &quot;, the layer need not be partially or fully inserted. In many or most cases, the layer 70 is substantially thin and is a double-sided structure coated on each side by the anode material, but is not covered by the anode material at their edges. In general, in the operation of the arrangement shown in FIG. 3, some or all of the second layer (portion) 23 of the anode is "lost" from the anode when discharged (when converted to lithium ions migrating to the electrolyte). When charging, when lithium ions are plated with lithium metal on the anode, lithium ions are plated over the layer 70 as part 23 (or at least part of the part 23). One of ordinary skill in the art recognizes that in a cell such as that described herein, there is a small total amount of lithium loss per every charge / discharge cycle of the cell. 3 (or most of the layer 23) can be selected so that most or all of the layer 23 is lost during the full discharge of the cell (the complete "satisfaction" of the cathode) The cathode can no longer participate in the charging process due to limitations that can be understood by those skilled in the art). Layer 70 is selected to be conductive to lithium ions. The intercalation layer can protect the underlying Li layer from damage because the high Li + flux in the first cycle damages the top Li layer surface. Thus, once the entirety of the layer 23 is consumed in a particular discharge cycle, an additional discharge results in the oxidation of lithium from layer 21, the passage of lithium ions through layer 70, and the release of lithium ions into the electrolyte do. Of course, layer 23 need not be the particular amount of all or nearly all of which is consumed during the first discharge. There may be several discharge / charge cycles, and a small amount of intrinsic lithium loss through each cycle, in order to cause the need to draw lithium from the section 21 through layer 70 into the electrolyte. Once these occur, however, the subsequent charge / discharge cycles will typically proceed as follows.
Through most of the discharge cycles, lithium will be removed from the section 23, and at the very end of the discharge cycle, a small amount of lithium is injected into the layer 70 (in order to compensate for the amount of lithium lost in the most recent charge / To be pulled out of the section 21 through the openings 21a and 21b. Upon charging, lithium will be plated as material 23 on layer 70 in an amount slightly less than the amount removed from the anode during discharge. The electrode stabilization layer 70 may be made of any suitable material selected by those skilled in the art according to the function described herein. Typically, layer 70 will be made of a material that is single-ion conductive but does not allow the lithium metal itself to pass through. In some embodiments, the material is non-electrically conductive for the following reasons.
The ratio of the thicknesses of the first and second layers of the base electrode material can be calculated based on, for example, the required "discharge depth" of the first discharge (amount of lithium metal consumed). The ratio may be in the range of, for example, 0.2 to 0.4. The thickness of the anode 20 may be, for example, less than 100 microns, less than 50 microns, less than 25 microns, or less than 10 microns. In some embodiments, the thickness of the anode 20 may be between 10 and 30 microns.
In some embodiments, the thickness of the intercalation layer 70 may be from 0.01 to 1 micron and may vary depending on, for example, the type of material used to form the intercalation layer and / or the method of depositing the material. For example, the thickness of the intercalation layer may be from 0.01 to 0.1 microns, from 0.1 to 0.5 microns, or from 0.5 to 1 microns. In another embodiment, a thicker insertion layer is included. For example, the thickness of the intercalation layer can be from 1 to 10 microns, from 10 to 50 microns, or from 50 to 100 microns. In some cases, the intercalation material may be formed of a polymer comprising, for example, those previously listed with lithium ion conductivity. The polymer film can be deposited using techniques such as vacuum based PML, VMT, or PECVD techniques. In other cases, the intercalation layer may comprise a metal or semi-conductive material. The metal and semi-conductive material may be sputtered, for example. One of ordinary skill in the art can select appropriate materials, thicknesses, and methods of depositing an intercalation layer, based on routine experience in combination with the teachings herein.
In one embodiment, layer 70 is a multi-layered anode stabilization structure, as described above in connection with FIG. 2 and described in more detail below.
The second layer 23 of lithium is used to protect the surface of the anode 20 (e.g., the Li surface) by limiting the current density-induced surface damage to the thin Li layer on the intercalation layer 70 Can be used. For example, instead of the anode 20 lithiuming the cathode to protect the anode 20, the layer 23 lithiumates the cathode in a first cycle (e.g., under very high Li + flux) (Removed in the form of lithium ions from the anode). A small amount of lithium is simply removed from the section 21 and no lithium in the section 21 is removed from the section 21 after every charge / discharge cycle (after the point at which more lithium is removed from the anode during discharge than to layer 23) - Not plated. This can eliminate or reduce the number of defects, gaps, small holes, and / or resin crystals that form on the surface of the anode 20 during cathode lithiation. The structure 12 can improve the cycle life of the battery as compared to a cell comprising a second Li layer and / or an anode without an interlayer, as described in more detail below.
As noted, layer 70 must be capable of passing lithium ions. The layer may be made of a material comprising a ceramic, glass, or polymer layer (or the following multi-layer structure) that is conductive to Li ions, and in some embodiments, It substantially interferes. Within this context, "substantially interfering" means that in this embodiment the material allows at least 10 times greater lithium ion flux than electron passing. In certain embodiments, the material allows at least 20 times greater, 50 times greater, or 100 times greater lithium ion flux than electron passing. As is well known, in other embodiments, the material may be electronically conductive.
Referring again to FIG. 3, the anode 12 may operate with any of a variety of current collectors (not shown). Current collectors are well known to those skilled in the art and can be readily selected from suitable materials based on these descriptions. In one arrangement, the current collector addresses the bottom surface of the section 21 of the anode 20 (the side facing the electrolyte 60). In another arrangement, an edge collector is used, which may be located on one or more edges, i.e., on a surface that includes section 21, material 70, and section 23, as described in FIG. 3 . In other arrangements, both a bottom collector and one or more edge collectors may be used. If only the bottom collector is used, the material 70 should have electron conductivity as well as lithium ion conductivity. When an edge collector is used, the material 70 may be selected to substantially impede electron passage.
In one particular embodiment, the use of edge collectors provides advantages in anode stabilization / protection. One such arrangement is shown in FIG. 4 wherein the stabilized structure 24 (similar to section 70 of FIG. 3 by itself) inserts the Li anode 20 into the second Li sublayer 23 Working Li layer) into one portion 21 (Li reservoir). The interlayer, for example the multi-layer structure 24, the Li reservoir and layer 22, may all be electrically connected to the edge current collector 80. In the arrangement shown in Fig. 4, the bottom current collector is not used.
During operation of the electrochemical cell as described in FIG. 4, or another cell comprising an intercalation layer between two layers of base electrode material with edge collectors in the discharge process, current enters the anode through the working Li / electrolyte interface . However, the intercalation layer can substantially block the electron current while allowing the passage of Li ions. For example, as illustrated by the arrows in FIG. 4, the flow of electron current to section 21 of the anode and to one or more current collectors may be substantially disturbed through the electrode stabilization layer. So that a significant or substantially all of the current can pass through the working Li layer 23 toward the edge collector 80, for example in the direction of the arrow 84, (Not shown), in the direction of arrows 82 and 89, towards the Li reservoir 21 of the edge collector, or in the direction of arrows 86 and 88, To pass through the stabilizing material (24). As mentioned, in some embodiments, for example, to satisfy the cathode during cathode lithiation, the working Li layer includes a more active electrode species that is consumed during the full discharge of the counter electrode. For example, the working Li layer may be formed of Li (Li) before the first discharge of the battery so that more than 50%, more than 70%, more than 90%, or more than 95% of Li of the working layer 23 is electrochemically dissolved in the first discharge. , &Lt; / RTI &gt;
Upon charging, the lithium ions are plated as lithium metal at the anode, as described above in connection with FIG. The electrolyte / working Li layer 23 / edge collector 80 is the lowest resistance path for the electron current, and once the Li ions reach the working Li layer and are reduced, most of the current will gain this path. The current density induced damage / corrosion remains largely undamaged, while any such process is largely minimized since it occurs only at the interface, or mainly at the electrolyte / working Li (23) interface. As discussed above in connection with FIG. 3, this Li is replaced by a flux of Li ions directed to the electrolyte past the intercalation layer 24, since the working Li layer loses less of the Li during each cycle. This may result in more loss / re-plating of lithium during the discharge / charge cycle, so that damage / corrosion may be suppressed or essentially zero in the Li reservoir 21, while minimizing damage / corrosion of the anode. As a result, when using a single-layer Li anode, the Li reservoir does not degrade into an isolated Li island surrounded by corrosion by-products.
Various arrangements can be applied to promote the plating of lithium in section 23 during charging. For example, although it may be advantageous for the layer 24 to be formed to be substantially non-electrically conductive in the embodiment illustrated in FIG. 4, one or more layers of the structure may be electrically conductive Can be made. For example, one or more of the layers in the structure 24, e.g., the section 23 and the layer 52 closest to the electrolyte 60 may be made somewhat or substantially electrically conductive. In this way, during charging, even deposition of the first very thin lithium layer on the anode can occur evenly across the substrate 24. [ Once the lithium portion is deposited, then the lithium's own electronic conductivity also facilitates a more uniform deposition of material 23.
The structure as shown in Figs. 3 and 4 can be used in a primary or secondary battery. In some cases, the electrical energy storage and use method includes alternately discharging current from the battery to define an at least partially discharged device, and alternately discharging the at least partially discharged device to define an at least partially recharged device. At least partially filling. This discharge and charge may cause the base electrode material from the working Li layer (e.g., layer 23 of FIG. 4) to be consumed during discharging to a greater extent than re-plated during charging, The material may be refilled from the base electrode layer (e.g., layer 21 of FIG. 4) through the intercalation layer to the working Li layer. Such a cell may operate in the presence of an aqueous (e.g., water) or air electrolyte in the electrochemical delivery state of the anode and the cathode.
When a rechargeable lithium battery using an aqueous electrolyte, or other primary or secondary electrochemical device described herein and useful for coupling with the components of the present invention, is configured by one of ordinary skill in the art, one or more of the features Can be applied. For example, the device may include an electrode stabilization component 22 as shown in FIG. In other arrangements, the device may include a stabilizing component 70 as shown in FIG. In another arrangement, the multi-layered electrode stabilization structure described in connection with FIG. 2 comprises at least one hydrophobic material which is water and / or basic (pH higher than or greater than 7.1) and which interferes with the passage of the aqueous electrolyte May be used as shown in FIG. The combination of these structures or one or more of them results in a very robust aqueous lithium rechargeable battery which may also be compact and / or lightweight (between the anode and the outer layer, the layer comprising the anode and the outer layer Less than 1 micron, less than 500 microns, less than 300 microns, less than 250 microns, less than 200 microns, less than 150 microns, less than 100 microns, less than 75 microns, less than 50 microns Or less than 10 microns). Thus, the present invention provides an electrochemical cell comprising an anode having lithium as the active anode material, a cathode, and an aqueous electrolyte in an electrochemical delivery state of the anode and the cathode, and a method of discharging and charging the battery alternately, Wherein at the end of the nth cycle the cell represents at least 80% of the initial capacity of the cell, wherein n is at least 3, 5, 10, 15, 25, 50, 100, 150, 200 or 250 or more. As mentioned, the present invention can be used to improve the lifetime of a rechargeable lithium battery by applying an aqueous electrolyte. &Quot; Aqueous electrolyte " as used herein refers to an electrolyte comprising at least 20 wt% water, more typically at least 50 wt%, 70 wt%, 80 wt%, or 90 wt% or more of water. Several additional properties may be included to aid function in rechargeable batteries useful in aqueous environments, or in environments exposed to air. In the case of aqueous electrolytes, in order to substantially reduce the presence of hydrogen ions which can be harmful if the electrolyte is exposed to lithium or other alkali metal electrodes, in one embodiment, the pH is made to be at least 7.1, In other embodiments at least 7.2, 7.3, 7.4, 7.5, 7.6, 7.7 or 7.8. In some embodiments, the pH of the electrolyte may be 7 to 8, 8 to 9, 9 to 10, 10 to 11, or 11 to 12 before the first discharge.
The preparation of the electrolyte in its basic form may be carried out by one of ordinary skill in the art without undue experimentation, providing an electrolyte with the ability to function effectively in the device and without causing disruption or other deleterious effects. Suitable basic species which may be added to the aqueous electrolyte to be applied to the lithium battery to achieve a basic pH as described above include, for example, certain components of the lithium battery, the environment of use (e.g., air / Environment), a method of using a battery (for example, a primary or secondary battery), and the like. Suitable basic species may also be selected from the group consisting of the basicity (e.g., pH) of the species, the extent of species diffusion, and / or the probability of species reacting with the electrolyte, other components in the electrolyte, A single ion conductive layer, and an anode layer), and / or a cathode material. Generally, the chemical reaction between the basic species and such components of the cell is blocked. Thus, one skilled in the art can select a suitable basic species by, for example, knowing the reactivity between the components of the cell and species and components, and / or by simple shielding tests. One simple shielding test involves adding the species to the electrolyte in the presence of a material component of the cell (e.g., a single-ion conductive material) and whether the species has reacted and / or has a negative effect on the material And &lt; / RTI &gt; Another simple shielding test involves adding a species to the electrolyte of the cell in the presence of the battery component, discharging / charging the battery, and observing the occurrence of interference or other deleterious effects as compared to the control system. Other simple tests may be performed by those skilled in the art.
In order to achieve basic pH as described above, species that may be added to the aqueous electrolyte applied to the lithium battery are not only alkaline and alkaline earth metals (Group 1 and Group 2 metals respectively metals) but also ammonium-containing species Ammonium, ammonium carbonate and ammonium sulphide). Specific examples of the species that can be added to the aqueous electrolyte to achieve the basic pH include ammonia, aniline, methylamine, ethylamine, pyridine, calcium carbonate, calcium hydroxide, iron monoxide, potassium acetate, potassium hydrocarbons, Potassium hydroxide, potassium hydroxide, sodium acetate, sodium benzoate, sodium hydrocarbon, sodium carbonate, sodium hydroxide, sodium metasilicate, sodium sesquicarbonate, sodium phosphate, sodium hydrogenphosphate, sodium sulfite, sodium cyanide, trisodium phosphate, But are not limited to, magnesium, barium hydroxide, calcium hydroxide, lithium hydroxide, rubidium hydroxide, cesium hydroxide, and strontium hydroxide. It is routine to those skilled in the art to determine the amount of such additive necessary to make the electrolyte of the desired pH.
In an alternative arrangement suitable for maximizing the effect of an alkali metal electrode-containing device, particularly a rechargeable battery, used in combination with an aqueous electrolyte, an electrode stabilization / protection component (e.g., shown in FIGS. 1 and 2, Alternatively shown in Figures 3 and 4) may be substantially impermeable to water. This can be done by selecting one or more substances that are sufficiently hydrophobic or otherwise interfere with water transport.
This concept will be described only by way of example with reference to FIG. In Fig. 2, one effective device will include a top hydrophobic layer (shown as layer 56) to block the water passages. In other arrangements, the intermediate layer (e.g., 44, 52, 42, etc.) may be sufficiently hydrophobic to block the water passage. In other arrangements, the layers together substantially block the water passage, although not all layers are individually sufficiently hydrophobic or even manufactured to substantially block the water passage. For example, each layer, or some combination or sub-combination of layers, may each be somewhat hydrophobic in order to repel water to some extent. In such an arrangement, the combination of layers may be made / manufactured or selected to substantially block the entire water passage. A hydrophobic measurement useful for selecting such a material is the contact angle magnitude between the water and the candidate material. "Hydrophobic" may be considered as a relative term in some cases, while a certain degree or amount of hydrophobicity is easily selected for the selection of a material for the construction of an anode stabilizing structure which significantly interferes with the specific material and / Can be readily selected by a person of ordinary skill in the art with the aid of knowledge of the characteristics of the contact angle magnitude to be determined. "Significantly" in context means that if 100% water is completely removed after 100 cycles of the rechargeable device using the stabilizing component if an aqueous electrolyte is used and if water is present, Lt; RTI ID = 0.0 &gt; 100 &lt; / RTI &gt; parts per million. In another embodiment, the water will be present in an amount of less than 75 ppm, 50, 25, 10, 5 or 2 ppm.
Various materials and arrangements can be used in the individual assemblies described or illustrated herein, or in all assemblies. It is to be understood that when a particular component or arrangement is described in connection with an embodiment or figure, the component or arrangement may be used in combination with any other. An example of such a structure is a separation layer, for example a temporary protective material layer or a plasma CO 2 treatment layer, positioned between the anode layer and the polymer layer or multi-layer structure. For example, in the embodiment shown in FIG. 1, layer 30 is a separation layer. It is understood that when the separating layer 30 is used, the first layer adjacent to the separating layer facing the electrode is sometimes referred to herein as being adjacent to the electrode. This is because the separating layer is optional. In all of the examples where the layer is described as being adjacent to or immediately adjacent to the electrode {e.g., the polymer layer 40 of FIG. 1), a separating layer for inserting may be used, but need not be used. The separation layer may improve the suitability of the base electrode material (e.g., lithium) with the deposited layer on top of the electrode. For example, if a single-ion conductive layer is required at the lithium interface, it is desirable to deposit this layer directly over the lithium surface. However, precursors or components of such superficial layers can react with lithium to produce undesired by-products or to cause undesirable morphological changes in the layer. By depositing a separation layer on the lithium surface (FIG. 2) before depositing the interfacial layer, such as the multi-layer structure 24, side reactions at the lithium surface can be eliminated or greatly reduced. For example, the interfacial film of lithium oxynitride, described in Bates, U. S. Patent No. 5,314, 765, is deposited in a nitrogen atmosphere by sputtering Li 3 PO 4 on the lithium surface, and nitrogen gas is deposited on the anode surface to form lithium nitride LiN &lt; / RTI &gt; 3 ). By depositing a layer of protective material that may be "temporary " (e.g., copper over the lithium surface), the interfacial layer may be formed without forming lithium nitride. A "temporary" protection layer is present or identifiable after some time since the device is configured, e.g., after a period of time using the device. For example, a thin layer of copper 30 located on the lithium anode 20 (described in the context of FIG. 1) may be formed by depositing a thin layer of copper over a period of time and / Of copper, but will diffuse into the alloy with the anode until the layer 30 is no longer present or identifiable.
The layer of temporary protective material can be alloyed with the lithium metal or can be dissolved and / or dissolved in the lithium metal, for example during the electrochemical cycle of the battery and / or before the electrochemical cycle of the battery, &Lt; / RTI &gt; The temporary protective material layer may serve as a barrier layer to protect the lithium surface during deposition of other layers, such as deposition of a multi-layer structure on top of the anode. Furthermore, the temporary protective layer may allow the migration of the lithium film from one forward location to the next, or solvent coating of the layer onto the anode, without undesirable reactions occurring on the lithium surface during assembly of the cell.
The thickness of the temporary protective material layer is selected to provide the necessary protection for the layer comprising lithium, for example during subsequent processing to deposit another anode or cell layer. In some embodiments it is desirable to keep the layer thickness as thin as possible while providing the desired degree of protection in order not to add an excess of non-active material to the cell which increases the weight of the cell and reduces the energy density of the cell Do. In one embodiment, the thickness of the temporary protective layer is 5 to 500 nanometers, for example 20 to 200 nanometers, 50 to 200 nanometers, or 100 to 150 nanometers.
Suitable materials that can be used as the temporary protective material layer include metals such as copper, magnesium, aluminum, silver, gold, lead, cadmium, bismuth, indium, gallium, germanium, zinc, tin and platinum.
In some cases, the protective structure 30 may comprise a plasma treated layer such as a CO 2 or SO 2 inducing layer. The plasma treated layer allows almost the entire anode surface area to participate in the current carrying process. That is, the plasma treated layer allows a uniform current density across the surface and reduces the pitting on the surface. In some cases, this treatment alone increases the cycle life by 15% to 35% on a routine basis, because more Li is available during discharge. Plasma surface treatment can make more Li available for cycling while creating a morphologically substantially uniform surface.
Fig. 5 shows the results of one comparative example showing the advantages of the temporary protective layer 30, which may be used in any or all combinations of other features of the present invention. 5 shows an SEM image of the Li anode surface after the tenth discharge. Figures 5A-5C show an image of a non-plasma treated Li anode after the device has been fully used. The point is the area where Li is corroded from the surface. Figures 5d-5f show an anode surface treated with a layer of LiPON that has undergone advanced use compared to Figures 5a-5c. On these surfaces, Li is corroded under defects in LiPON coatings. Figures 5G-5I show the anode surface treated with CO 2 plasma, and again after the forward use, compare Figures 5A-5C and Figures 5D-5F. This image shows that a substantial portion of the anode surface was used during discharge, showing low current discharge density across the surface and increased cycle life.
Another example of a structure that can be used in conjunction with some embodiments of the present invention is that any nano pores and / or small pores of the single-ion conductive layer can be polymeric or other species And a single-ion conductive layer (e.g., a portion of a multi-layer structure) treated with a migration-inhibiting material. This filling can create an infiltrated porous barrier (IPBM), which can reduce the rate of migration of certain species (e. G., Electrolyte, water and oxygen) toward the anode, Can be increased.
Advantageously, the filled single-ion conductive layer can have a combination of low permeability and high flexibility due to the final network of permeable migration-inhibiting material. When a polymer is selected, the higher modulus of such species as compared to a brittle compound that can be used in a single-ion conductive layer will provide flexibility and resistance to cracking in IPBM, which is not possible for any single-ion conductive material . Polymers having physical properties, such as the other cases described herein, can be used for such permeable species. The crack-free flexibility can improve the adhesion between the impregnated polymer and the inner surface of the single-ion conductive material and is increased due to the high surface energy of the single-ion conductive material prior to penetration.
In one embodiment, the single-ion conductive layer is permeated by the monomer precursor of the migration-inhibiting material so that the porous structure is effectively filled with the monomer, and the monomer has a high surface energy To the nanoporous region of the porous single-ion conductive layer. The single-ion conductive material can be treated by an activation process before being treated with the monomer, so that the surface energy in the material is significantly higher than the surface energy achievable in a normal atmospheric process.
In some instances, the monomer vapor may be condensed on the single-ion conductive material layer, thereby causing the mono-ionic conductive material layer to remain in contact with the mono-ionic conductive material layer until all or a portion of the usable meandering through- The subsequent curing step may be introduced for photo-initiating techniques, plasma treatment, or one of the electron beams for polymerization of the permeable monomer. The particular curing method used will vary depending on the particular choice of material and layer thickness among the various.
Suitable materials for use as migration-inhibiting materials include materials known to completely or partially interfere with (or determine interference with, simple shielding) movement of unwanted specific species through the material. As mentioned, the materials may also be selected according to their physical properties and include properties that add flexibility and / or strength to the overall material to be bonded. Specific examples of materials include, as mentioned, polymers described herein for use as layers in multi-layer constructions, and / or other polymers or other species. Hydrophobicity is preferably added to the entire array, one way to do so is to use a permeable migration-inhibiting material with some degree of hydrophobic character.
The formation of an IPBM-type structure can be achieved by several methods; In some embodiments, however, the IPBM is formed by a vacuum vapor deposition process and is formed by devices readily available in conventional manufacturing processes. The inorganic vapor source may comprise any suitable conventional source, including, but not limited to, sputtering, evaporation, electron-beam evaporation, chemical vapor deposition (CVD), plasma-assisted CVD, and the like. The monomer vapor source can similarly be any conventional monomer vapor source and can be used to produce flash vaporization, boat evaporation, vacuum monomer technology (VMT), polymer multilayer (PML) technology, evaporation from permeable membranes, But is not limited to, any other source known to be effective. For example, monomer vapor can be produced from a variety of permeable metal frits, such as conventional monomer deposition. Such methods are described, inter alia, in U.S. Patent Application No. 5,536,323 (Kirlin) and U.S. Patent Application No. 5,711,816 (Kirlin).
Individual activation may be used in some cases to provide additional activation energy during or after deposition of the single-ion conductive material layer. In some cases, an individual activation source may not be needed, since it is asymmetric magnetron sputtering, plasma immersion, or plasma-enhanced CVD type, and sufficient activation is already obtained by the deposition method itself. Alternatively, it is possible to provide a surface of a catalyst or a low work function, for example ZrO 2 , Ta 2 O 5 , or any type of single-ion conductivity, such as various oxides and fluorides of Group IA and Group IIA metals The material can provide sufficient activity even in a relatively non-active deposition process.
All of the surface area within the single-ion conductive material layer need not be penetrated by the migration-inhibiting material to achieve an effective penetration barrier. Therefore, not all small holes in single-ion conductivity are required to be filled. In some cases, less than 10%, less than 25%, less than 50%, less than 75%, or less than 90% of the small holes and / or pinholes are filled with the polymer, for example, to reduce penetration of certain species through the layer . In some cases, the aforementioned advantages can be achieved as long as such small pores that contribute substantially to the penetration are substantially filled with the polymer.
Other advantages and methods of forming a filled single-ion conductive layer are discussed in U.S. Patent Application No. 2005/0051763 (Affinito).
FIG. 6 is a cross-sectional view of an embodiment of the present invention, as shown in FIGS. 2, 4, and 7, illustrating a significant barrier to the passage of undesired components from the electrolyte to the anode through the electrode stabilization layer, with filled nanopores / The principle behind the use of the multi-layer electrode stabilizing component is shown. In the figure, the serpentine path indicated by arrow 71 is provided in an illustrative manner to denote significant distances and distortions that need to go through the entire multi-layer array to reach such a paper anode. If the nano pores and pinholes are filled with a pass-through obstruction material, such as a polymeric material that interferes with the movement, migration is greatly slowed. This, combined with distortion as shown, can result in a sharp decrease in the movement of such species and a sharp increase in cycle life, as mentioned above. It can show how much the number of layers with the final offset of the small holes present in the ion-conducting material. Where a single layer of such a material is used, the small hole can be substantially more easily interrupted by unwanted species entering the electrode. In certain embodiments, the migration-inhibiting material fills essentially all of the gaps, including small holes and nanopores of the single ion-conducting material, and / or small holes and nanopores of the polymer layer. In other arrangements, only one or two of the gaps are filled. In some cases, the migration-inhibiting material is an auxiliary material, that is, a material not coming from a single-ion conductive material, and / or a material not coming out of a polymer layer. That is, the material may be the one that does not form part of one of these components, because such components would otherwise be made and assembled together, but exist only through the auxiliary process required to fill such a gap. In some cases, the material does not occur in a single-ion conductive material or polymeric material.
In some embodiments, the structure includes an outer layer, e. G., A layer in contact with the electrolyte of the cell. This outer layer may be a layer such as the stabilizing layer 22, 24, 26, etc., as shown in the figure, or it may be an auxiliary outer layer that is specifically selected for direct connection with the electrolyte. If such an auxiliary outer layer is used, it can be chosen to be quite hydrophobic when used in combination with an aqueous electrolyte and a rechargeable lithium battery. The outer layer can be made of a variety of materials including, but not limited to, Li-ionic conductivity, electronic conductivity, protection of underlying layers that may be unstable and components present in the electrolyte, non-porosity to prevent passage by the electrolyte solvent, compatibility with the electrolyte and underlying layer, And sufficient flexibility to accommodate changes in the volume of the layer observed during charging. The outer layer should be further stable and preferably not dissolved in the electrolyte.
Examples of suitable outer layers include, but are not limited to, organic or inorganic solid polymer electrolytes, electrically and ionically conductive polymers, and metals with definite lithium dissolution properties. In one embodiment, the polymer of the outer layer is selected from the group consisting of an electrically conductive polymer, an ion conducting polymer, a sulfonated polymer, and a hydrocarbon polymer. Additional examples of polymers suitable for use in the outer layers of the present invention are described in U. S. Patent No. 6,183, 901 to Ying et al.
As mentioned, the structure further comprises a substrate on the surface of the anode layer, for example on a surface facing the multi-layer structure. The substrate is useful as a support for depositing a first layer comprising a base electrode material and can provide additional stability for the treatment of thin lithium-film anodes during battery fabrication. In addition, in the case of a conductive substrate, such a substrate can also act as a useful current collector, effectively collecting the electrical current generated through the anode and providing an effective surface for attachment of electrical contacts through which external circuitry is accessible. A wide range of substrates are known in the prior art for the anode. Suitable substrates include metal foils, polymeric membranes, metallized polymeric membranes, electrically conductive polymeric membranes, polymeric membranes having an electroconductive coating, electrically conductive polymeric membranes having an electroconductive metallic coating, and polymeric membranes dispersed in conductive particles , But is not limited thereto.
FIG. 7 illustrates an example of a structure including some embodiments described herein. As illustrated in the embodiment shown in Figure 7, structure 14 includes a substrate 96 and a layer 20 (e.g., consisting essentially of or entirely of lithium metal) . A separation layer 30, which may comprise a plasma-treated layer or a temporary metal layer, may be formed on top of the base anode layer 21. The structure may include a second lithium layer 23 and an intercalation layer 72 comprising, for example, alternating polymer layers 40 and 42 and single-ion conductive layers 50 and 52. In some embodiments, the single-ion conductive material layer may comprise or consist essentially of a metal. The single-ion conductive material layer may be an IPBM-type structure, for example, a layer of nano pores / small pores filled with a suitable polymer to reduce the permeability of the layer. The second separation layer 32 may be disposed on the second lithium layer 22. The multi-layer structure 28 may comprise four alternating polymeric layers (e.g., layers 43, 44, 45 and 46) and a single-ionic conductive material (e.g., layers 53, 54, 55 and 56) have. Of course, four or more polymer / single ion conductive layers may be included. The structure may also include a current collector 81 and the outer layer 90 may be positioned between the anode layer 20 and the electrolyte 60 of the cell. In some cases, the total thickness of the layer that protects the anode, e.g., between the isolation layer 30 and the outer layer 90, and including the isolation layer and the outer layer is less than, for example, 5 mm, Less than 2 mm, less than 1 mm, less than 700 microns, less than 500 microns, less than 400 microns, less than 300 microns, less than 250 microns, less than 200 microns, less than 150 microns, less than 100 microns, less than 75 microns, Less than 25 microns, or less than 10 microns.
Advantageously, the cell of the present invention may be compact, lightweight, and have a high energy density. The total thickness of the layers of the battery between the anode 20 and the outer layer 90 and including the anode and the outer layer is less than 2 cm, less than 1.5 cm, less than 1 cm, less than 0.7 cm, less than 0.5 cm, less than 0.3 cm Less than 1 mm, less than 700 microns, less than 500 microns, less than 400 microns, less than 300 microns, less than 250 microns, less than 200 microns, less than 150 microns, less than 100 microns, less than 75 microns, Or less than 10 microns, depending on the particular application of the battery, for example. Embodiments such as structure 14 may be suitable for use with electrolytes such as aqueous solvents (e. G., Water) and may operate as primary or secondary batteries.
The cells described herein may have high specific energies in certain embodiments. The non-energy of the battery may be, for example, greater than 100 Wh / kg, greater than 200 Wh / kg, greater than 400 Wh / kg, greater than 500 Wh / kg, or greater than 800 Wh / kg.
Suitable cathode active materials for use in the cathodes of electrochemical cells of the invention include, but are not limited to, electroactive transition metal chalcogenides, electroactive conductive polymers, and electroactive sulfur-containing materials, and combinations thereof Do not. The term "chalcogenide ", as used herein, pertains to compounds containing at least one element of oxygen, sulfur, and selenium. Examples of suitable transition metal chalcogenides are Mn, V, Cr, Ti, Fe, Co, Ni, Cu, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Hf, Ta, And Ir, electroactive oxides, sulfides, and selenides of a transition metal selected from the group consisting of: &lt; RTI ID = 0.0 &gt; In one embodiment, the transition metal chalcogenide is selected from the group consisting of an electroactive oxide of nickel, manganese, cobalt, and vanadium, and an electroactive sulfide of iron. In one embodiment, the cathode active layer comprises an electroactive conductive polymer. Examples of suitable electroactive conductive polymers include, but are not limited to, electroactive and electrically conductive polymers selected from the group consisting of polypyrrole, polyaniline, polyphenylene, polythiophene, and polyacetylene. Preferred conductive polymers are polypyrrole, polyaniline, and polyacetylene.
As used herein, an "electroactive sulfur-containing metal" refers to a cathode active material comprising any form of sulfur element, wherein the electrochemical activity includes breaking or forming a sulfur-sulfur covalent bond. Suitable electroactive sulfur-containing materials include, but are not limited to, sulfur elements and organic materials including sulfur atoms and carbon atoms, which may or may not be polymers. Suitable organic materials further include heteroatoms, conductive polymer segments, composites and conductive polymers.
In some embodiments, including Li / S system, the sulfur of the oxidized form-containing material, shared -S m - portion (moiety), ionic -S m - from the group consisting of a part-section, and ionic S m 2 These include the polysulfide portion (S m), wherein m is an integer greater than or equal to 3. In one embodiment, m of the polysulfide portion (S m ) of the sulfur-containing polymer is an integer of 6 or more. In another embodiment, m of the polysulfide moiety (S m ) of the sulfur-containing polymer is an integer greater than or equal to 8. In another embodiment, the sulfur-containing material is a sulfur-containing polymer. In another embodiment, the sulfur-containing polymer has a polymer backbone chain and the polysulfide portion (S m) is covalently bonded by one or both of the terminal sulfur atoms as instrumental to the polymer backbone chain. In yet another embodiment, the sulfur-containing polymer is bonded to the polymer backbone chain by covalent bonding of terminal sulfur atoms of the polysulfide portion has a polymer backbone chain and the polysulfide portion (S m).
In one embodiment, the electroactive sulfur-containing material comprises greater than 50 wt.% Sulfur. In another embodiment, the electroactive sulfur-containing material comprises greater than 75 wt% sulfur. In another embodiment, the electroactive sulfur-containing material comprises greater than 90 weight percent sulfur.
The properties of the electroactive sulfur-containing materials useful in the practice of the present invention may vary as is known in the art. In one embodiment, the electroactive sulfur-containing material comprises a sulfur element. In another embodiment, the electroactive sulfur-containing material comprises a mixture of a sulfur element and a sulfur-containing polymer.
Examples of sulfur-containing polymers are disclosed in U.S. Patent Nos. 5,601,947 and 5,690,702 to Skotheim et al .; U.S. Patent Nos. 5,529,860 and 6,117,590 to Skotheim et al .; And U.S. Patent Application Serial No. 08 / 995,122, now U.S. Patent No. 6,201,100, issued March 13, 2001 to Gorkovenko et al., And PCT Application WO 99/33130. Other suitable electroactive sulfur-containing materials, including polysulfide bonds, are described in U.S. Patent No. 5,411,831 to Skotheirn et al., U.S. Patent No. 4,664,991 to Perichaud et al, and U.S. Patent Nos. 5,723,230, 5,783,330, 5,792,575 And 5,882,819. Much more examples of electroactive sulfur-sulfur oil materials are described, for example, in U.S. Patent No. 4,739,018 to Armand et al .; U.S. Patent Nos. 4,833,048 and 4,917,974 to De jonghe et al; U.S. Patent Nos. 5,162,175 and 5,516,598 to Visco et al .; And those containing disulfide groups as described in U.S. Patent No. 5,324,599 to Oyama et al.
The cathode further comprises one or more conductive fillers to provide improved electronic conductivity. Examples of conductive fillers include, but are not limited to, conductive carbon, graphite, activated carbon fibers, non-activated carbon nanofibers, metal flakes, metal powders, metal fibers, carbon fibers, metal nets, and electrically conductive polymers Do not. If a conductive filler is present, the amount thereof may range from 2 to 30% by weight of the cathode active layer. The cathode may further include other additives, including, but not limited to, metal oxides, alumina, silica, and transition metal chalcogenides.
The cathode may also include a binder. The choice of binder material may vary as long as they are inactive for other materials at the cathode. Useful binders are materials that are generally polymeric, which allows for ease of processing of the cell electrode composite and is generally known to those skilled in the art of electrode fabrication. Examples of useful binders include polytetrafluoroethylene (Teflon), polyvinylidene fluoride (PVF 2 or PVDF), ethylene-propylene-diene (EPDM) rubber, polyethylene oxide (PEO), UV curable acrylate, Possible methacrylates, and thermosetting divinyl ether, and the like. If binder is present, the amount thereof may range from 2 to 30% by weight of the cathode active layer.
Electrolytes used in electrochemical or battery cells can act as mediators for the storage and transport of ions, and in special cases of solid electrolytes and gel electrolytes, these materials can additionally act as separators between the anode and the cathode. As mentioned, in one embodiment, a water-based electrolyte is used. Any liquid, solid or gel material capable of storing or transferring ions can be used as long as they are electrochemically and chemically unreactive with the anode and cathode and facilitate the movement of lithium ions between the anode and the cathode. The electrolyte may be electrically non-conductive to prevent shorting between the anode and the cathode.
The electrolyte can include one or more ionic electrolyte salts to provide ionic conductivity, and one or more liquid electrolyte solvent gel polymeric materials, or polymeric materials. Suitable non-aqueous electrolytes can include organic electrolytes comprising one or more materials selected from the group consisting of liquid electrolytes, gel polymer electrolytes, and solid polymer electrolytes. Examples of non-aqueous electrolytes for lithium batteries are described in Dorniney's Lithium Battery, New Materials, Development and Forecast, Chapter 4, pages 137-165, Elsevier, Amsterdam (1994). Examples of gel polymer electrolytes and solid polymer electrolytes are described in Alamgir et al., Lithium batteries, New Materials, Development and Prospects, Chapter 3, pages 93-136, Elsevier, Amsterdam (1994).
Examples of useful non-aqueous liquid electrolyte solvents are, for example, N-methyl acetamide, acetonitrile, acetal, ketal, ester, carbonate, sulfone, sulfite, sulfolane, aliphatic ether, cyclic ether, glymes ), Polyethers, phosphate esters, siloxanes, dioxolanes, N-alkylpyrrolidones, substituted forms of the foregoing, and mixtures thereof. Fluorinated derivatives of the foregoing are also useful as liquid electrolyte solvents.
In some cases, the aqueous solvent may be used as an electrolyte of a lithium battery. The aqueous solvent may comprise water and may include other components such as ionic salts. As noted above, in some embodiments, to reduce the concentration of hydrogen ions in the electrolyte, the electrolyte can include species such as lithium hydroxide, or other species that provide electrolyte bases.
The liquid electrolyte solvent may also be useful as a plasticizer for gel polymer electrolytes. Examples of useful gel polymer electrolytes include, but are not limited to, polyethylene oxide, polypropylene oxide, polyacrylonitrile, polysiloxane, polyimide, polyphosphazene, polyether, sulfonated polyimide, perfluorinated membrane (NAFION resin), polydivinyl polyethylene Polyalkylene glycol dimethacrylate, derivatives of the foregoing, copolymers of the foregoing, crosslinked and network structures of the foregoing, and mixtures of the foregoing, and optionally one or more And one or more polymers selected from the group consisting of aliphatic, alicyclic, and plastic.
Examples of useful solid polymer electrolytes include polyethers, polyethylene oxides, polypropylene oxides, polyimides, polyphosphazenes, polyacrylonitriles, polysiloxanes, derivatives thereof, copolymers thereof and crosslinked and network structures thereof, and Mixtures thereof, and the like.
In addition to conventionally known electrolyte solvents, gelling agents, and polymers for forming electrolytes, and as is also known in the art, the electrolyte may further include one or more ionic electrolyte salts to increase ionic conductivity.
Examples of ionic electrolyte salts for use in the electrolyte of the present invention LiSCN, LiBr, LiI, LiClO 4 , LiAsF 6, LiSO 3 CF 3, LiSO 3 CH 3, LiBF 4, LiB (Ph) 4, LiPF 6, LiC ( SO 2 CF 3 ) 3 , and LiN (SO 2 CF 3 ) 2 . Other electrolyte salts that may be useful include lithium polysulfide (Li 2 S x ), and a lithium salt of an organic ionic polysulfide (LiS x R) n , wherein x is an integer from 1 to 3 and n is 1 And R is an organic group, which are described in U.S. Patent No. 5,538,812 to Lee et al.
In some embodiments, the electrochemical cell further comprises a separator interposed between the anode and the cathode. The separator may be a solid non-conductive or insulating material that separates or isolates the cathode and anode from each other, prevents short circuits, and allows movement of ions between the cathode and the anode.
The pores of the separator may be partially or essentially filled with electrolyte. The separator may be provided as a standing film without pores, which is sandwiched between the cathode and the anode during fabrication of the cell. Alternatively, for example, as described in PCT Publication No. WO 99/33125 to Carlson et al. And U.S. Patent No. 5,194,341 to Bagley et al., A porous separator layer can be applied directly to one of the electrodes have.
The diversity of separator materials is known in the art. Examples of suitable solid porous separator materials include, but are not limited to, polyolefins such as, for example, polyethylene and polypropylene, glass fiber papers, and ceramic materials. Other examples of separator and separator materials suitable for use in the present invention include those comprising a microporous xerogel layer, for example, as a microporous mock-bohemite layer, as a free standing film, or as a co- May be provided by direct application of a coating onto one of the electrodes as described in U.S. Patent Application Serial Nos. 08 / 995,089 and 09 / 215,112. The solid electrolytes and the gelated electrolytes can also function as separators in addition to these electrolyte functions.
As described above, the variety of ion-conducting species, and the class of polymers, are useful for the present invention. In some cases, an ionic conductive species, which is also electrically conductive, is used. In other cases, an ionically conductive species that is inherently non-electrically conductive is used.
Examples of ionic conductor species that include single-ion conductive species suitable for use in the present invention and are also substantially electrically conductive include Group 14 and Group 15 metals (e.g., Ge, Sn, Pb, As, Sb, Bi) Lt; RTI ID = 0.0 &gt; lithium &lt; / RTI &gt; The polymer that is substantially conductive to a single ion electric conductivity, the lithium salts {e.g., LiSCN, LiBr, LiI, LiClO 4, LiAsF 6, LiSO 3 CF 3, LiSO 3 CH 3, LiBF 4, LiB (Ph ) 4 , LiPF 6 , LiC (SO 2 CF 3 ) 3 and LiN (SO 2 CF 3 ) 2 } (also known as an electronic polymer or a conductive polymer). Conductive polymers are known in the art and examples of such polymers include poly (acetylene), poly (pyrrole), poly (thiophene), poly (aniline), poly (fluorene), polynaphthalene, poly ), And poly (para-phenylene vinylene). The electro-conductive additive may also be added to the polymer to form an electro-conductive polymer. Conductivity of the specific electrically conductive material, for example 10 -2 S / ㎝ than, 10 -1 S / ㎝ excess, 1S / ㎝ than, 10 1 S / ㎝ than, 10 2 S / ㎝ than, 10 3 S / ㎝ , Greater than 10 4 S / cm, or greater than 10 5 S / cm. Examples of ion-conductive species that are substantially non-electrically conductive include non-electrically conductive materials (e. G., Electrically insulating materials) doped with lithium salts. For example, acrylate, polyethylene oxide, silicon, polyvinyl chloride, and other insulating polymers doped with a lithium salt may be ionically conductive but substantially non-electrically conductive. In some embodiments, the single-ion conductive material may also comprise a non-polymeric material. The resistivity of a particular non-electrically conductive material may be greater than 10 3 ohm-cm, greater than 10 4 ohm-cm, greater than 10 5 ohm-cm, greater than 10 6 ohm-cm, greater than 10 7 ohm- Can be more than 8 ohm-cm. Those skilled in the art will be able to select a single ionically conductive species that is substantially electrically conductive and substantially non-electrically conductive without undue experimentation and can apply simple shielding tests to select from candidate materials. A simple shielding test involves placing the material as a separator in an electrochemical cell that requires the passage of both ion species and electrons across the material in order to function. This is a test that goes to use. If the material is substantially ionic and electrically conductive in this test, then the resistance or resistivity across the material will be low. Other simple tests may be performed by those skilled in the art.
The present invention also employs polymeric materials, some of these polymeric materials being ionic and some being electrically conductive. As is the case with single-ion conductive materials that are electrically conductive or electrically conductive, those skilled in the art can readily select or manufacture such polymeric materials. Such a polymeric material may also be selected or prepared to have the physical / mechanical properties as described above, for example by adjusting the amount of the components of the polymeric mixture, adjusting the degree of cross-linking (if any) . Simple shielding tests such as those described above can be used to select polymers having suitable ionic and / or electronic properties.
Polymer layers suitable for use in multi-layer structures include polymers that are highly conductive to lithium and have minimal conductivity to electrons, including, for example, ion conducting polymers, sulfonated polymers, and hydrocarbon polymers. The choice of polymer will depend on many factors including the properties of the electrolyte and the cathode used in the cell. Suitable ion conducting polymers include, for example, ion conducting polymers known to be useful for solid polymer electrolytes and gel polymer electrolytes (e. G., Polyethylene oxide) for lithium electrochemical cells. Suitable sulfonated polymers include, for example, sulfonated siloxane polymers, sulfonated polystyrene-ethylene-butylene polymers, and sulfonated polystyrene polymers. Suitable hydrocarbon polymers include, for example, ethylene-propylene polymers, polystyrene polymers, and the like.
The polymer layer of the multi-layer structure may also be a polymeric layer such as an alkyl acrylate, a glycol acrylate, a polyglycol acrylate, a polyglycol acrylate, a polyacrylate, or a polyacrylate, as described in U.S. Patent Application No. 6,183,901 to Ying et al. A polyglycol vinyl ether, a polyglycol divinyl ether, and the like. For example, such a crosslinked polymeric material is polydivinyl poly (ethylene glycol). The crosslinked polymeric material may further comprise a salt (e. G., A lithium salt) to improve ionic conductivity. In one embodiment, the multi-layered polymeric layer comprises a crosslinked polymer.
Other classes of polymers that may be suitable for use in the polymer layer include polyamines {e.g., poly (ethyleneimine) and polypropyleneimine (PPI)}; Polyamide (for example, polyamide (Nylon), poly (? -Caprolactam) (Nylon 6), poly (hexamethylene adipamide) (Nylon 66)}, polyimide , Poly (pyromellitic mid-1,4-diphenyl ether) (Kapton)}; Polyvinyl pyrrolidone), poly (methylcyanoacrylate), poly (ethyl cyanoacrylate), poly (butyl acrylate), poly Poly (vinyl alcohol), poly (vinyl chloride), poly (vinyl fluoride), poly (2-vinylpyridine), vinyl Polymers, polychlorotrifluoroethylene, and poly (isohexylanoacrylates); Polyacetal; Polyolefins {e.g., poly (butene-1), poly (n-pentene-2), polypropylene, polytetrafluoroethylene}; Polyesters {e.g., polycarbonate, polybutylene terephthalate, polyhydroxybutyrate}; Polyethers {poly (ethylene oxide) (PEO), poly (propylene oxide) (PPO), poly (tetramethylene oxide) (PTMO)}; Vinylidene polymers {e.g., polyisobutylene, poly (methylstyrene), poly (methyl methacrylate) (PMMA), poly (vinylidene chloride), and poly (vinylidene fluoride); Polyaramids {e.g., poly (imino-1,3-phenyleneiminoisopthaloyl) and poly (imino-1,4-phenyleneiminoterephthaloyl)}; Polyheteroaromatic compounds {for example, polybenzimidazole (PBI), polybenzobisoxazole (PBO) and polybenzobisthiazole (PBT)}; Polyheterocyclic mixtures (e. G., Polypyrroles); Polyurethane; Phenolic polymers (e. G., Phenol-formaldehyde); Polyalkyne (e.g., polyacetylene); Polydienes (e.g., 1,2-polybutadiene, cis or trans-1,4-polybutadiene); Polysiloxanes {e.g., poly (dimethylsiloxane) (PDMS), poly (diethylsiloxane) (PDES), polydiphenylsiloxane (PDPS), and polymethylphenylsiloxane (PMPS); And inorganic polymers (e.g., polyphosphazene, polyphosphonate, polysilane, porisilazane). The mechanical and electronic properties (e.g., conductivity, resistivity) of such polymers are known. Thus, one of ordinary skill in the art can select and / or select a suitable polymer for use in a lithium battery, for example, based on the mechanical and / or electronic properties (e.g., ionic and / or electronic conductivity) (E.g., single ionic conductivity) and / or electron conductivity based on the knowledge of the art in combination with the techniques of the prior art. For example, the previously listed polymeric materials, salts to improve ion conductivity, such as lithium salts (e.g., LiSCN, LiBr, LiI, LiClO 4, LiAsF 6, LiSO 3 CF 3, LiSO 3 CH 3, LiBF 4 , LiB (Ph) 4 , LiPF 6 , LiC (SO 2 CF 3 ) 3 and LiN (SO 2 CF 3 ) 2 }.
The figures accompanying this disclosure show only schematic, substantially flat battery devices. It will be appreciated that any electrochemical cell device may be constructed using the principles of the invention in any configuration. 1, an anode 20 may be fabricated such that components 30, 40, and 50 are disposed on opposite sides of a side that is shown as a similar or identical set of components 30, 40, Can be covered. In such an arrangement, a substantially mirror-image structure is created with the mirror plane passing through the anode 20. This may be achieved, for example, by providing a "rolled" structure in which the layers of the anode 20 are surrounded on each side by structures 30, 40 and 50 (or alternatively, Battery configuration. On the outside of each protective structure of the anode, an electrolyte is provided, and a cathode is provided facing the electrolyte. In a roll-type device or other device comprising multiple layers of alternating anode and cathode functions, the structure involves an anode, an electrolyte, a cathode, an electrolyte, an anode, ..., The anode stabilization structure as described in US Pat. Of course, at the outer boundary of such an assembly, there will be a "terminal" anode or cathode. Circuits interconnecting such layered or rolled structures are well known in the art.
The following examples are intended to illustrate specific embodiments of the invention, but are not to be construed as limiting, and do not exemplify the full scope of the invention.
Rama Nord ( lamanode Manufacturing and Characteristics of Structures
A structure comprising a first and a second layer of Li separated by a lamellar structure, e. G., An insulator layer which is conductive to Li ions, but which is substantially non-conductive to electrons, is formed in two Li layers with different thicknesses And is produced by thermal evaporation (vacuum evaporation) of Li on the PET substrate. The two Li layers are separated by an embedded layer of low-conductivity material, such as LiPON, Li 3 N, and the like. The thickness ratio of the upper and lower Li layers is calculated based on the required DoD (Depth of Discharge) of the first discharge, and is in the range of 0.2 to 0.4. A about 0.01 to 1 micron layer (LiPON) is deposited on top of the thick bottom Li layer by rf magnetic sputtering from Li 3 PO 4 in an N 2 atmosphere. For example, a thin Li layer, such as 5 microns, is thermally evaporated on top of the embedded layer.
The upper (thin) Li layer that interfaces with the electrolyte decomposes in the first discharge. During the next charge, Li is deposited on the surface of the low-conductivity LiPON interposed layer. During the second discharge, the Li deposition decomposes to a degree corresponding to the cycling efficiency. The Li cycling efficiency (Eff) is defined by Equation (1).
Where Q c is the amount of Li deposition in Ah and Q a is the amount of Li dissolved in Ah. At a Li efficiency of less than 1, the remaining amount of Li is decomposed from the bulk to complete the 100% cycle. E eff for practical systems is generally higher than 0.98. Therefore, during the second discharge, a minor amount of Li relative to the total cathode charge is transferred from the bulk Li through the inserted layer (s) to the electrolyte and the cathode. This amount, which is 100 times smaller than the amount of Li dissolved during Li and the first anode decomposition and cathode lithiation, does not substantially affect the morphology of the underlying layer of Li and the coordinated protective layer. The same scenario repeats any subsequent 100% cycles on the cell. As fewer defects, cracks and pinholes are formed on the Li and the tuned interposed layer surface, the Li cycling efficiency is increased, and the cycle life is longer. Such a laminode may be built into the cell with a cathode, for example with an electrolyte suitable for 60 to 75% sulfur and sulfur chemistry.
In one embodiment, a small prismatic cell comprising a polyethylene "tonen" separator with a thickness of 16 microns and a counter electrode with a geometric surface of 30 cm &lt; 2 &gt; and action is deposited on an aluminum plastic polyethylene bag of "sealrite"Lt; / RTI &gt; A mixed solution of ether and Li amide salt is added to the bag to act as an electrolyte. Two types of batteries are built:
A) Li-working electrode with a thickness of about 25 microns made by thermal evaporation of Li on 23 um PET for simplicity. This single-layer electrode is used as a control.
B) Li-working electrode having approximately the same thickness, including for example a three-layer structure such as a laminode. In addition,
I) 20 micron heat evaporated Li on PET,
Ii) 0.075 micron of LiPON made by rf magnetic sputtering from Li 3 PO 4 in a N 2 atmosphere on top of a 20 micron Li,
Iii) 5 micron heat evaporated Li on the top of the layer of LiPON.
Both cell designs used 25 micron thermally evaporated Li counter electrodes on 23 micron PET. The cells were discharged using the same conditions of current of 0.2 mA / cm 2 and 20% DoD of Li. After the discharge, the cell was opened in a glove box, and the working electrode was studied by SEM.
The results from these experiments are shown in Fig. Fig. 8A shows a SEM image of the control, and Fig. 8B shows a laminar structure. Figure 8c shows a 5000x magnification of the structure shown in Figure 8b after removal of the top Li layer. It can be observed from the SEM photograph that the lamina structure is substantially free of any defects such as cracks and pinholes. However, the single-layer Li surface control is greatly influenced by the state of the first discharge.
This example demonstrates that a laminode structure comprising first and second layers of Li separated by an implanted layer that is conductive to Li ions but substantially non-conductive to electrons can increase the desired properties of the electrochemical cell .
Laminode Cycle life of the structure
This example shows that the Li cycling efficiency is increased and the cycle life is longer for a cell containing a laminate structure than a cell having a single layer of a base electrode material.
To fabricate the control cell, a cathode comprising 65% S coated on one side of a prismatic cell with heat evaporated Li on one side of a 23 micron thick PET, separator tonne, and Rexam Al foil, And is sealed in a light bag. A mixture of an ether and a Li imide salt is used as the electrolyte. The working surface of the anode is 400 cm 2 . The cell was tested for cycle life performance at a discharge current of 200 mA to a cut-off of 1.8 V and at a charge current of 0.1 A for 4 hours. Cycling results obtained from three control cells were obtained.
The same cell design described above is constructed, but has a first laminode anode structure (or "sandwich anode") instead of a single-layer anode. The first laminode structure comprises 20 microns thick thermally evaporated Li deposited on 23 microns of PET. A layer of 0.02 micron LiPON is sputtered rf self-sputtered from Li 3 PO 4 in a N 2 atmosphere on top of a 20 micron thick Li, and 5 microns of Li is thermally evaporated on top of the embedded LiPON layer. The same test method for the control cells applies to these cells.
The average FoM (Li Cycling Efficiency) of the control is compared to the average FoM of the first laminode-containing cell, resulting in a significant improvement in the cycle life of the battery.
The battery-like battery is constructed and tested under the same conditions using a second laminode structure comprising a 20 micron thick layer of heat evaporated Li, 0.075 micron thick LiPON layer, and a 5 micron heat evaporated Li layer .
Comparing the FoM obtained from the second laminode structure with the control FoM, a significant improvement in the cycle life of the laminode structure compared to the control anode is observed.
Different types of discharge capacity Anode Effect of Protection
This example shows the effect of different types of anode protection on the discharge capacity of the cell.
Controls used in these experiments include VDLi / CO 2 structures equivalent to Li foils. The first test structure includes a VDLi / CO 2 / polymer (1500-2500 Angstrom) structure. The second test structure includes a VDLi / CO 2 / polymer (1500-2500 Angstrom) structure. The third test structure includes a laminode (sandwich anode) of VDLi / LiPON / VDLi / CO 2 / SPE. In this particular experiment, each cell is cycled several times and an improvement of 30-40% in cycle life is obtained when the cell comprises a polymer layer as compared to a cell without a polymer layer. Significant improvement in cycle life is obtained when the cell contains an embedded layer of LiPON compared to a cell without an inserted layer. The inserted layer, and a cell containing the lamina node structure with a polymer layer, for example VDLi / LiPON / VDLi / CO 2 / SPE cells are single-life cycle than the cell, such as VDLi / CO 2 having a layer anode . &Lt; / RTI &gt; In other embodiments, the degree of improvement in the life-cycle can vary depending on, for example, the number of polymer layers, the multi-layer structure, the embedded layer making up the cell, the thickness and materials used to form such a structure.
This example shows that an electrochemical cell comprising an inserted layer and a polymer layer has an increased cycle life as compared to such an unstructured cell.
While various embodiments of the present invention have been illustrated and described herein, those skilled in the art will readily conceive of various other means and / or structures for obtaining one or more of the advantages and / or the results and / or performing the functions described herein, Modifications and / or alterations are deemed to be within the scope of the present invention. More generally, all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and / or configurations may vary depending upon the particular application or applications in which the teachings of the present invention are used It will be readily appreciated by those skilled in the art. Those skilled in the art will recognize or recognize many equivalents to the specific embodiments of the invention described herein, which will only be recited in routine experimentation. It will therefore be appreciated that the preceding embodiments are provided by way of example only, and that the invention may be practiced otherwise than as specifically described and claimed, within the scope of the appended claims and equivalents thereof. The present invention is directed to each individual feature, system, article, material, kit, and / or method described herein. Moreover, any combination of such features, systems, articles, materials, kits, and / or methods is intended to be within the scope of the present invention unless the features, systems, articles, materials, kits, and / do.
All definitions defined and used herein should be understood to govern dictionary definitions, definitions of merged documents for reference, and / or the ordinary meaning of defined terms.
The singular terms used herein should be understood to mean "at least one, " unless expressly indicated to the contrary.
As used herein, the term " and / or "should be understood to mean" either or both "of the combined elements, that is, elements that are present in combination in some cases and that are otherwise present. &Quot; and / or "should be interpreted in the same manner, i.e.," one or more " Other elements may optionally be present, unlike the elements identified by the phrases "and / or ", irrespective of whether or not they are associated with a specifically identified element. Quot; A " and " B "when used in connection with an unrestricted language such as" includes &quot; Can be; In another embodiment, only B (optionally including elements other than A) may be mentioned; In yet another embodiment, both A and B (optionally including other elements) and the like may be mentioned.
As used herein, "or" should be understood to have the same meaning as "and / or" as defined above. For example, when separating an item from a list, the term "or" or " and / or "includes inclusive, i.e. includes at least one or more than one of the elements of the list, . &Lt; / RTI &gt; It will be understood that, by way of example, and not limitation, " consisting only of one of "or" exactly one of, " something to do. In general, the term "or" as used herein refers to a proprietary alternative when preceded by an exclusive term such as "any", "one of", " That is, "one or the other but not both"). "Consisting essentially of" has the usual meaning as used in the patent law when used in the claims.
As used in the specification and claims, referring to the list of one or more terms, the phrase "at least one" means at least one element selected from any one or more of the elements in the list of elements, It should be understood that it is not necessary to include at least one of every element described and does not exclude any combination of elements from the list of elements. This definition also allows that the phrase "at least one" may optionally exist in addition to the specifically identified elements in the list of elements that the phrase refers to, whether or not the element is associated with or not associated with a specifically identified element. Thus, as a non-limiting example, "at least one of A and B" (or equivalently, "at least one of A or B," or equivalently "at least one of A and / or B) May refer to at least one A not including B (optionally including elements other than B) optionally including one or more; In another embodiment, there may be mentioned at least one B, optionally including one or more, wherein A is absent (optionally including elements other than A); In another embodiment, at least one B (optionally including another element) optionally including one or more may be mentioned.
Also, to the contrary, unless otherwise indicated, it is to be understood that in any claimed method that involves one or more steps or actions, the order of steps or acts of the method need not necessarily be limited to the order in which the steps or acts of the method are listed do.
In the claims and the above description, the terms "comprising," "including," "carrying," "having," "containing," "involving, Quot ;, "holding ", " composed of, ", etc. are to be construed as open- The typical phrases "consisting of" and "consisting essentially of" may be typical phrases, each of which is exclusive or semi-exclusive, as described in the United States Patent and Trademark Office Patent Examination Procedures Manual, Section 2111.03.
As described in detail, the present invention relates to electrode protection in an electrochemical cell, and more particularly to electrode protection in aqueous and non-aqueous electrochemical cells comprising a rechargeable lithium battery, and use in a water and / or air environment For use in a rechargeable electrochemical cell comprising a lithium anode.
An electrochemical cell comprising an electrode comprising a base electrode material comprising an electroactive species,
A first electroactive layer comprising the electroactive species;
A second electroactive layer comprising the electroactive species, wherein at least a portion of the electroactive species are consumed and re-plated upon discharging and charging the electrochemical cell, respectively; And
A polymer layer or a single-ion conductive layer separating the first electroactive layer and the second electroactive layer
And an electrochemical cell.
A non-aqueous electrolyte in electrochemical transfer with the electrode;
A single-ion conductive material layer between the second electroactive layer and the electrolyte; And
The polymer layer between the second electroactive layer and the electrolyte
An isolation layer between the base electrode material and the polymer layer, wherein the isolation layer is a plasma-treated layer or a metal layer.
An anode disposed between the anode and the electrolyte,
At least two first layers each of a single-ion conductive material; And
At least two second layers of polymeric material each
And a multi-layer structure comprising:
Wherein the at least two first layers and the at least two second layers are alternately arranged,
Wherein each layer of the multi-layer structure has a maximum thickness of 25 microns,
Cycling the cell by alternately discharging and charging the electrochemical cell according to any one of claims 1 to 4 at least three times, wherein at the end of the third cycle, Of at least 80%.
Alternately performing at least partially discharging a current from the electrochemical cell of claim 1 to define an at least partially discharged device and at least partially filling the at least partially discharged device to define an at least partially recharged device, Include
The base electrode material from the first layer is consumed during discharging to a greater extent than re-plated upon filling,
Wherein the base electrode material is filled from the second layer to the first layer across the single-ionic conductive non-electrically conductive layer.
An electrochemical cell comprising a single-ion conductive layer comprising a ceramic that is conductive to lithium ions.
Wherein the ceramic comprises lithium nitride, lithium oxide, or both.
Wherein the single-ion conductive layer comprises pores and at least a portion of the pores are filled with a polymer.
Wherein the single-ion conductive layer has a thickness of less than 500 nm.
Wherein the single-ion conductive layer has a thickness of less than 50 nm.
Wherein the polymer layer comprises a polyacrylate.
Wherein the polymer layer comprises a lithium salt.
Wherein the polymer layer has a thickness of less than 500 nm.
Wherein said polymer layer has a thickness of less than 100 nm.
An electrochemical cell further comprising an electrolyte.
And the second electroactive layer is positioned between the first electroactive layer and the electrolyte.
And a protective layer positioned between the electrode and the electrolyte.
Wherein the protective layer is a multi-layered protective structure alternately comprising a single-ion conductive layer and a polymer layer.
Wherein the multi-layered protective structure comprises at least five layers.
Wherein the thickness of the multilayered protective structure is less than 5 mm.
Wherein the thickness of the multi-layered protective structure is less than 1 mm.
Wherein the electrochemical cell further comprises a current collector electrically connected to both the first electroactive layer and the second electroactive layer.
Wherein the first electroactive layer and the second electroactive layer have a layer structure with at least one edge, the current collector extends across both the first electroactive layer and the second electroactive layer, And an electrochemical cell.
Wherein the second electroactive layer comprises a quantity of electroactive species prior to a first discharge of the cell such that at the first discharge 70% of the electroactive species of the second layer is electrochemically dissolved, battery.
Wherein the electroactive species in the second electroactive layer is removed upon full discharge of the electrochemical cell.
Wherein the first electroactive layer and the second electroactive layer are configured such that during at least some charge and discharge cycles during the life of the cell at least some electroactive species from the first electroactive layer cross the multi- An electrochemical cell structurally arranged to supplement electroactive species in a layer.
Wherein the electrode is an anode comprising lithium metal.
Wherein the first electroactive layer and the second electroactive layer are each a lithium metal layer.
Wherein at least one of the first electroactive layer and the second electroactive layer is a lithium metal alloy layer.
An electrochemical cell comprising a cathode comprising sulfur as an electroactive species.
Wherein the cathode further comprises a conductive carbon material.
An electrochemical cell further comprising a polymer gel layer.
An electrochemical cell comprising an electrolyte comprising a solvent comprising at least one of a sulfone, an aliphatic ether, a cyclic ether, and a polyether.
The electrolyte is LiSCN, LiCF 3 SO 3 and LiN (CF 3 SO 2), an electrochemical cell comprising at least one of the two.
Wherein the thickness of the electrode ranges from 5 to 50 microns.
Wherein the second layer comprises more electroactive species than is consumed during the full discharge of the electrochemical cell prior to the first discharge of the cell.
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