Query: LLTO PEO

title: Effect of the LLTO nanoparticles on the conducting properties of PEO based solid electrolyte
abstract: The influence of LLTO (Li0.33La0.56TiO3) nanoparticles on the conducting properties of PEO (polyethylene oxide)8 LiClO4 polymer salt complex electrolyte still remains not fully understood. This paper aims to establish the role of LLTO filler concentration, its morphology, agglomeration and charge nanoparticles surface on the ionic transport of (PEO)8 LiClO4 based solid electrolytes. Four samples of (PEO)8 LiClO4 LLTO composites, with 0, 5, 10 and 15 wt% of LLTO filler, were prepared. Several techniques were used to verify the obtainment of the required samples and to find out how the LLTO filler can modify the conductivity of the (PEO)8 LiClO4 polymer salt complex electrolyte. The obtained results suggest that the transport of Li ions in these nanocomposites occurs predominantly through the polymeric phase, not by the conducting LLTO ceramic employed as filler. The highest conductivity value (10 3 S/cm at 338 K) is reached for 10 wt of LLTO filler in the composite, where the polymeric phase is completely amorphous.

title: High performance solid PEO/PPC/LLTO nanowires polymer composite electrolyte for solid state lithium battery

title: A novel solid PEO/LLTO nanowires polymer composite electrolyte for solid state lithium ion battery
abstract: In this study, fast ionic conductor Li0.33La0.557TiO3 (LLTO) nanowires with high ionic conductivity were prepared through electrospinning and subsequent high temperature calcination. It was filled in the poly(ethylene oxide) (PEO) matrix as a filler and the novel solid PEO/LiTFSI/LLTO nanowires polymer composite electrolytes were prepared via solution casting method with low cost. The results showed that the addition of LLTO nanowires could effectively improve the ionic conductivity, electrochemical stability window, transference number, and compatibility with lithium metal of polymer composite electrolytes. The maximum ionic conductivities of composite electrolytes filled with 5 wt% LLTO nanowires at room temperature and 60 degC were 5.53 x 10 5 S cm 1 and 3.63 x 10 4 S cm 1, respectively. Its electrochemical stability window was up to 4.75 V. The LiFePO4/Li solid state lithium ion battery assembled with the novel polymer composite electrolytes had good cycling stability. At current rate of 0.5 C, the discharge specific capacity remained about 123 mAh g 1 after 100 cycles at 60 degC.

title: Composite PVDF PEO based microporous polymer membrane reinforced by LLTO nanoparticle
abstract: Composite microporous polymer membrane based on poly(vinylidene fluoride)(PVDF),poly(ethylene oxide)(PEO),and La0.5Li0.5TiO3(LLTO)nanoparticle(denoted as PVDF PEO/LLTO)was prepared by a simple phase inversion technique.LLTO nanoparticle can improve the electrochemical properties with forming new channels on its surface.When the content of LLTO is 8%,the porosity of the composite microporous membranes is up to 62.38%,liquid electrolyte(1 mol L 1LiPF6/EC/DMC solution)weight uptake is 240.28%,ionic conductivity is up to 2.15 x 10 3 S/cm,and the electrochemical window is 4.5V.The high room temperature ionic conductivity combined with good electrochemical stability implies that PVDF PEO/LLTO based composite microporous polymer membrane can be used as candidate separator material for practical applications in lithium ion batteries.

title: Lithium Salt Rich PEO/Li0.3La0.557TiO3 Interpenetrating Composite Electrolyte with Three Dimensional Ceramic Nano Backbone for All Solid State Lithium Ion Batteries.
abstract: Solid electrolytes with high ionic conductivity and good mechanical properties are required for solid state lithium ion batteries. In this work, we synthesized composite polymer electrolytes (CPEs) with a three dimensional (3D) Li0.33La0.557TiO3 (LLTO) network as a nano backbone in poly(ethylene oxide) matrix by hot pressing and quenching. Self standing 3D CPE membranes were obtained with the support of the LLTO nano backbone. These membranes had much better thermal stability and enhanced mechanical strength in comparison with solid polymer electrolytes. The influence of lithium (Li) salt concentration on the conductivity of 3D CPEs was systematically studied, and an ionic conductivity as high as 1.8 x 10 4 S*cm 1 was achieved at room temperature. The electrochemical window of the 3D CPEs was 4.5 V vs Li/Li+ More importantly, the 3D CPE membranes could suppress the growth of Li dendrite and reduce polarization; therefore, a symmetric Li|3D CPE|Li cell with these membranes was cycled at a current density of 0.1 mA*cm 2 for over 800 h. All of the superior properties above made the 3D CPEs with the LLTO nano backbone a promising electrolyte candidate for flexible solid state lithium ion batteries.

title: A novel PEO|PEO perovskite|PEO composite electrolyte for all solid state lithium metal batteries.
abstract: Composite solid electrolytes (CSEs) are regarded as one of the most promising candidates for all solid state lithium metal batteries (ASSLMBs) due to inherited desirable features from both ceramic and polymer materials. However, poor interfacial contact/compatibility between the electrodes and solid electrolytes remains a critical challenge. In this work, we prepare a flexible CSE composed of PEO perovskite composite with a layer of PEO on either side. This PEO|PEO perovskite|PEO structure prevents direct contact between perovskite and lithium metal at the anode side, avoiding the undesired reaction between the two materials (Ti4+ Li Ti3+ Li+ Moreover, the design incorporating the PEO surface on either side enables superb contact between the electrolyte and the electrodes, and buffers the change in electrolyte volume from the cathode and lithium metal during repeated cycling, resulting in low interfacial resistances and excellent cycling stability. Meanwhile, perovskite inorganic electrolyte Li0.33La0.557TiO3 (LLTO) 3D nanofiber networks formed by electrospinning enable the CSE to achieve enhanced mechanical strength and high ionic conductivity of 0.16 mS cm 1 at 24 As a result, a Li|PEO LiTFSI LLTO|Li symmetric cell remains stable after 400 h of operation without short circuiting. Most notably, a Li|PEO LiTFSI LLTO|LiFePO4 full battery is capable of delivering a high capacity of 135.0 mAh g 1 even at 2 C with a retention rate of 79.0% after 300 cycles at 60 These results demonstrate that the integrated sandwich structure proposed in this work is effective in developing high performance composite solid electrolytes for ASSLMBs.

title: High Performance 3 D Fiber Network Composite Electrolyte Enabled with Li Ion Conducting Nanofibers and Amorphous PEO Based Cross Linked Polymer for Ambient All Solid State Lithium Metal Batteries
abstract: Solid electrolytes have gained attention recently for the development of next generation Li ion batteries since they can fundamentally improve the battery stability and safety. Among various types of solid electrolytes, composite solid electrolytes (CSEs) exhibit both high ionic conductivity and excellent interfacial contact with the electrodes. Incorporating active nanofibers into the polymer matrix demonstrates an effective method to fabricate CSEs. However, current CSEs based on traditional poly(ethylene oxide) (PEO) polymer suffer from the poor ionic conductivity of PEO and agglomeration effect of inorganic fillers at high concentrations, which limit further improvements in Li+ conductivity and electrochemical stability. Herein, we synthesize a novel PEO based cross linked polymer (CLP) as the polymer matrix with naturally amorphous structure and high room temperature ionic conductivity of 2.40 x 10 4 S cm 1. Li0.3La0.557TiO3 (LLTO) nanofibers are incorporated into the CLP matrix to form composite solid electrolytes, achieving enhanced ionic conductivity without showing filler agglomeration. The high content of Li conductive nanofibers improves the mechanical strength, ensures the conductive network, and increases the total Li+ conductivity to 3.31 x 10 4 S cm 1. The all solid state Li|LiFePO4 batteries with LLTO nanofiber incorporated CSEs are able to deliver attractive specific capacity of 147 mAh g 1 at room temperature, and no evident dendrite is found at the anode/electrolyte interface after 100 cycles. A highly ionic conductive 3 D fiber network composite solid electrolyte is introduced based on Li ion conducting nanofibers and amorphous poly(ethylene oxide) (PEO) cross linked polymer. With the reinforcement of Li0.3La0.557TiO3 (LLTO) nanofibers, the continuous 3D conduction network formed within the polymer matrix greatly enhances the electrochemical and mechanical properties of resultant composite solid electrolytes. Consequently, the lithium dendrite is effectively controlled after long cycles, and the all solid state Li|LiFePO4 prototype cells demonstrate excellent cycling stability at room temperature.

title: Li0.43La0.56Ti0.95Ge0.05O3/PEO composite solid electrolytes for flexible all solid state lithium batteries
abstract: In this work, electrochemical properties of Li<inf>0.43</inf>La<inf>0.56</inf>Ti<inf>0.95</inf>Ge<inf>0.05</inf>O<inf>3</inf>/PEO composite solid electrolyte were studied. The Li<inf>0.43</inf>La<inf>0.56</inf>Ti<inf>0.95</inf>Ge<inf>0.05</inf>O<inf>3</inf>/PEO composite solid electrolyte is successfully synthesised by ball milling solid reaction. Ti was successfully substituted by Ge in the LLTO lattice. It was found that the Ge LLTO/PEO was steady in an interval of 0 10 V. The conductivity of Li<inf>0.43</inf>La<inf>0.56</inf>Ti<inf>0.95</inf>Ge<inf>0.05</inf>O<inf>3</inf>/PEO sintered at 1150 degC was 9.2 x 10<sup> 6</sup> S cm<sup> 1</sup> As a result of its reasonable electrochemical properties, the Li<inf>0.43</inf>La<inf>0.56</inf>Ti<inf>0.95</inf>Ge<inf>0.05</inf>O<inf>3</inf>/PEO composite solid electrolyte could be applied for all solid lithium batteries.

title: Li 0.43 La 0.56 Ti 0.95 Ge 0.05 O 3 /PEO composite solid electrolytes for flexible all solid state lithium batteries
abstract: In this work, electrochemical properties of Li 0.43 La 0.56 Ti 0.95 Ge 0.05 O 3 /PEO composite solid electrolyte were studied. The Li 0.43 La 0.56 Ti 0.95 Ge 0.05 O 3 /PEO composite solid electrolyte is successfully synthesised by ball milling solid reaction. Ti was successfully substituted by Ge in the LLTO lattice. It was found that the Ge LLTO/PEO was steady in an interval of 0 10 V. The conductivity of Li 0.43 La 0.56 Ti 0.95 Ge 0.05 O 3 /PEO sintered at 1150 degC was 9.2 x 10 6 S cm 1. As a result of its reasonable electrochemical properties, the Li 0.43 La 0.56 Ti 0.95 Ge 0.05 O 3 /PEO composite solid electrolyte could be applied for all solid lithium batteries.

title: A composite solid electrolyte with a framework of vertically aligned perovskite for all solid state Li metal batteries
abstract: Composite solid electrolytes (CSEs) which inherit the flexibility of polymer electrolytes and the high ionic conductivity of ceramic electrolytes, hold a great potential to realize all solid state Li metal batteries (ASSLMBs) with high energy density and enhanced safety. However, conventional preparation methods for CSEs by randomly dispersing ceramic particles in a polymer matrix fail to provide effective Li+ conducting networks, thus severely sacrificing the high ionic conductivity of ceramic fillers. In this work, we develop a framework of vertically aligned perovskite Li0.33La0.557TiO3 (LLTO) embedded in a PEO LiTFSI matrix to maximize the ionic conduction. The vertically aligned LLTO structure prepared by an ice templating method provides fast, continuous and the shortest pathways for Li+ transport, thus boosting the ionic conductivity from 0.038 to 0.13 mS cm 1. As a result, a Li|LiFePO4 full battery assembled with the developed CSE is capable of delivering a specific discharge capacity of 144.6 mAh g 1 at 1 C at 60 degC with a high capacity retention of 96.0% after 100 cycles.