Search query: coating liuthium ion batteries

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abstract: Unlike the vast majority of transition metal dichalcogenides which are semiconductors, vanadium disulfide is metallic and conductive. This makes it particularly promising as an electrode material in lithium ion batteries. However, vanadium disulfide exhibits poor stability due to large Peierls distortion during cycling. Here we report that vanadium disulfide flakes can be rendered stable in the electrochemical environment of a lithium ion battery by conformally coating them with a ~2.5 nm thick titanium disulfide layer. Density functional theory calculations indicate that the titanium disulfide coating is far less susceptible to Peierls distortion during the lithiation delithiation process, enabling it to stabilize the underlying vanadium disulfide material. The titanium disulfide coated vanadium disulfide cathode exhibits an operating voltage of ~2 V, high specific capacity ~180 mAh g 1 @200 mA g 1 current density) and rate capability ~70 mAh g 1 @1000 mA g 1) while achieving capacity retention close to 100% after 400 charge discharge steps.VS2 is a promising cathode material for lithium ion batteries, but is susceptible to Peierls distortion during (de)lithiation. Here the authors show that VS2 cathodes can be stabilized by conformally coating them with a nanoscale TiS2 protective layer, leading to impressive electrochemical performance.
author_names: Lu Li

Zhaodong Li

Anthony Yoshimura

Congli Sun

Tianmeng Wang

Yanwen Chen

Zhizhong Chen

Aaron J Littlejohn

Yu Xiang

Prateek Hundekar

Stephen F Bartolucci

Jian Shi

Su-Fei Shi

Vincent Meunier

Gwo-Ching Wang

Nikhil A Koratkar
title: Vanadium disulfide flakes with nanolayered titanium disulfide coating as cathode materials in lithium ion batteries
venue: Nature Communications
year: 2019

abstract: Ni rich NCM based positive electrode materials exhibit appealing properties in terms of high energy density and low cost. However, these materials suffer from different degradation effects, especially at their particle surface. Therefore, in this work, tungsten oxide is evaluated as a protective inorganic coating layer on LiNi0.8Co0.1Mn0.1O2 (NCM 811) positive electrode materials for lithium ion battery (LIB) cells and investigated regarding rate capability and cycling stability under different operation conditions. Using electrochemical impedance spectroscopy, the interfacial resistance of uncoated and coated NCM 811 electrodes is explored to study the impact of the coating on lithium ion diffusion. All electrochemical investigations are carried out in LIB full cells with graphite as a negative electrode to ensure better comparability with commercial cells. The coated electrodes show an excellent capacity retention for the long term charge/discharge cycling of NCM 811 based LIB full cells, i.e. 80% state of health after more than 800 cycles. Furthermore, the positive influence of the tungsten oxide coating on the thermal and structural stability is demonstrated using postmortem analysis of aged electrodes. Compared to the uncoated electrodes, the surface modified electrodes show less degradation effects, such as particle cracking on the electrode surface and improvement of the thermal stability of NCM 811 in the presence of electrolyte.
author_names: Dina Becker

Markus Borner

Roman Nolle

Marcel Diehl

Sven Klein

Uta Rodehorst

R Schmuch

Martin Winter

Tobias Placke
title: Surface Modification of Ni Rich LiNi0.8Co0.1Mn0.1O2 Cathode Material by Tungsten Oxide Coating for Improved Electrochemical Performance in Lithium Ion Batteries.
venue: ACS applied materials interfaces
year: 2019

abstract: Abstract Fluorine doped anatase TiO2 (FATO) is successfully coated with thickness of 4 6 nm on the surface of Li1.2Mn0.54Ni0.13Co0.13O2 particles to improve the electrochemical and thermal properties of the Li rich cathode via a wet chemical method. The cathode coated by 2 wt% of FATO shows excellent electrochemical performances and high thermal stability. This sample delivers discharge capacities of 300.1 mAh g 1 at 1 C and 257 mAh g 1 even at 10 C. Besides, it shows high capacity retentions of 91.5% and 73.2% after 500 cycles at 1 C and 5 C, respectively. Furthermore, in situ XRD patterns confirm that the coated sample delivers the decomposition temperature of 293 degC to convert hexagonal structure (R 3m) to cubic spinel structure (Fd 3m) This study shows that the nanoscale coating layer containing oxygen vacancies can greatly enhance electrochemical and thermal properties of Li rich cathode materials used in high performance lithium ion batteries.
author_names: Mohadese Rastgoo-Deylami

Mehran Javanbakht

Hamid Omidvar
title: Enhanced performance of layered Li1.2Mn0.54Ni0.13Co0.13O2 cathode material in Li ion batteries using nanoscale surface coating with fluorine doped anatase TiO2
venue: Solid State Ionics
year: 2019

abstract: One of the major hurdles of Ni rich cathode materials Li1+x(NixCozMnz)wO2, y 0.5 for lithium ion batteries is their low cycling stability especially for compositions with Ni 60% which suffer from severe capacity fading and impedance increase during cycling at elevated temperatures (e.g. 45 degC) Two promising surface and structural modifications of these materials to alleviate the above drawback are (1) coatings by electrochemically inert inorganic compounds (e.g. ZrO2) or (2) lattice doping by cations like Zr4+ Al3+ Mg2+ etc. This paper demonstrates the enhanced electrochemical behavior of Ni rich material LiNi0.8Co0.1Mn0.1O2 (NCM811) coated with a thin ZrO2 layer. The coating is produced by an easy and scalable wet chemical approach followed by annealing the material at =700 degC under oxygen that results in Zr doping. It is established that some ZrO2 remains even after annealing at =800 degC as a surface layer on NCM811. The main finding of this work is the enhanced cycling stability and lower impedance of the coated/doped NCM811 that can be attributed to a synergetic effect of the ZrO2 coating in combination with a zirconium doping.
author_names: F J M Schipper

Hana Bouzaglo

Mudit Dixit

Evan M Erickson

Tina Weigel

Michael Talianker

Judith Grinblat

Larisa Burstein

Michael Schmidt

Jordan Keith Lampert

Christoph Erk

Boris Markovsky

Dan Thomas Major

Doron Aurbach
title: From Surface ZrO2 Coating to Bulk Zr Doping by High Temperature Annealing of Nickel Rich Lithiated Oxides and Their Enhanced Electrochemical Performance in Lithium Ion Batteries
year: 2018

abstract: Sodium ion batteries (SIBs) have attracted tremendous interest and become a worldwide research hotpot owing to their low cost and abundant resources. To obtain suitable anode materials with excellent performance for SIBs, an effective and controllable strategy is presented to fabricate SnS2 nanosheets coating on nanohollow cubic CoS2 /C (CoS2 /C@SnS2 composites with a hollow structure using Co metal organic frameworks as the starting material. As anodes for SIBs, the CoS2 /C@SnS2 electrode exhibits ultralong cycle life and excellent rate performance, which can maintain a high specific capacity of 400.1 mAh g 1 even after 3500 cycles at a current density of 10 A g 1 When used in a full cell, it also shows enhanced sodium storage properties and delivers a high reversible capacity of 567.3 mAh g 1 after 1000 cycles at 1 A g 1 This strategy can pave a way for preparing various metal sulfides with fascinating structure and excellent performance for the potential application in energy storage area.
author_names: Ludi Shi

Dongzhi Li

Pingping Yao

Jiali Yu

Cui-hua Li

Bo Yang

Caizhen Zhu

Jian Xu
title: SnS2 Nanosheets Coating on Nanohollow Cubic CoS2 /C for Ultralong Life and High Rate Capability Half/Full Sodium Ion Batteries.
venue: Small
year: 2018

abstract: Abstract Four LiNi0.8Co0.15Al0.05 based Li ion battery cathode materials, i.e. the pristine LiNi0.8Co0.15Al0.05, Li excess Li1+xNi0.8Co0.15Al0.05, SnO2 coated LiNi0.8Co0.15Al0.05 and SnO2 coated Li excess Li1+xNi0.8Co0.15Al0.05 are prepared via a facile oxalate coprecipitation route, and are studied with respect to the effects of Li excess and SnO2 coating on the structure and electrochemical properties. X ray diffraction and X ray photoelectric spectroscopy demonstrate that a small amount of Li+ and/or Sn2+ ions are incorporated into the transition metal slabs of the modified materials, and hence reduce the cationic disorder of Li+/Ni2+ High resolution transmission electron microscopy and scanning electron microscopy confirm the formation of a SnO2 surface layer that prevents the growth and aggregation of the primary particles during high temperature solid reaction, and therefore results in formation of the SnO2 coated materials with nano/submicron sphere like morphology. Lithium excess and SnO2 coating enhance the electrochemical performance. The SnO2 coated Li excess Li1+xNi0.8Co0.15Al0.05 exhibits not only higher specific capacity and better rate capability but also excellent cycling stability. After 400 cycles at 1C rate, the capacity is decreased from 123.7 to 86.7 mAh g 1, giving capacity retention of 70.1% Li excess is believed to decrease the cationic mixing and SnO2 modification is deemed to restrict the undesirable side reaction between the active material and electrolyte.
author_names: Zhicheng Xie

Yingying Zhang

An-bao Yuan

Jiaqiang Xu
title: Effects of lithium excess and SnO2 surface coating on the electrochemical performance of LiNi0.8Co0.15Al0.05O2 cathode material for Li ion batteries
venue: Journal of Alloys and Compounds
year: 2019

abstract: Abstract Li rich manganese based layered electrode materials are expected to be superior performance cathode materials for next generation lithium ion batteries due to high capacity, low cost and environmentally benignity. However, the commercialization of such cathode materials is impeded by severe capacity fading and poor rate performance. To overcome these problems, Al2O3 is coated on the Li1.256Ni0.198Co0.082Mn0.689O2.25, meanwhile, spinel structure interface layer is formed between the Li1.256Ni0.198Co0.082Mn0.689O2.25 and Al2O3 coating. This modified cathode material has a significant improvement on rate performance with a discharge capacity of 189 mAhg 1 at current density of 1250 mAg 1. In addition, it reveals a discharge capacity of 240 mAhg 1 at current densities of 250 mAg 1 and a retention of 95.2% after 60 cycles. The improved rate performance and cycling stability are benefited from the formation of spinel structure interface layer and Al2O3 coating.
author_names: Xiaofeng Wen

Kui Liang

Lingyun Tian

Kaiyue Shi

Jusheng Zheng
title: Al 2 O 3 coating on Li 1.256 Ni 0.198 Co 0.082 Mn 0.689 O 2.25 with spinel structure interface layer for superior performance lithium ion batteries
year: 2018

abstract: Abstract Large interfacial resistance between electrode and electrolyte limits the development of high performance all solid state batteries. Herein we report a uniform coating of Li7P3S11 solid electrolyte on MoS2 to form a MoS2/Li7P3S11 composite electrode for all solid state lithium ion batteries. The as synthesized Li7P3S11 processes a high ionic of 2.0 mS cm 1 at room temperature. Due to homogeneous union and reduced interfacial resistance, the assembled all solid state batteries with the MoS2/Li7P3S11 composite electrode exhibit higher reversible capacity of 547.1 mAh g 1 at 0.1 C and better cycling stability than the counterpart based on untreated MoS2. Our study provides a new reference for design/fabrication of advanced electrode materials for high performance all solid state batteries.
author_names: Ruifeng Xu

Xiao long Wang

S Z Zhang

Yan Xia

Xinhui Xia

Junyong Wu

Jiangping Tu
title: Rational coating of Li7P3S11 solid electrolyte on MoS2 electrode for all solid state lithium ion batteries
year: 2018

abstract: Abstract Lithium rich layered oxide materials (LLOs) are widely studied due to its high reversible capacity. However, the stability during cycling and initial coulombic efficiency should be improved. Herein, we applied ball milling based facile calcination modification methods by combining doping fluorine and coating with Al2O3 to synthesis modified Li[Li0.20Ni0.133Co0.133Mn0.534]O2 cathode materials for lithium ion batteries. Characterization results of XRD, SEM and TEM show that fluorine doping could largely stabilized materials structure. Al2O3 coating is proved to improve LLOs' stability during cycling. The formation of Al F O H type species proved by X ray photoelectron spectra lead to improved discharge capacity and cycle performance. This work provides insight on the cost effective production of high quality LLOs and helps determine appropriate modifications to improve the commercial utilization of LLOs.
author_names: Siyu Liu

Zhilei Wang

Yongkui Huang

Zhijiang Ni

Jirong Bai

Shifei Kang

Yangang Wang

Xi Li
title: Fluorine doping and Al2O3 coating Co modified Li[Li0.20Ni0.133Co0.133Mn0.534]O2 as high performance cathode material for lithium ion batteries
year: 2018

abstract: Lithium rich oxides have been regarded as one of the most competitive cathode materials for next generation lithium ion batteries due to their high theoretical specific capacity and high discharge voltage. However, they are still far from being commercialized due to low rate capability and poor cycling stability. In this study, we propose a heterostructured LiAlF4 coating strategy to overcome those obstacles. The as developed lithium rich cathode material shows outstanding performance including a high reversible capacity (246 mA h g 1 at 0.1C) excellent rate capability (133 mA h g 1 at 5C) and ultralong cycling stability (3000 cycles) Comparing with those of pristine and AlF3 coated lithium rich cathode materials, the enhanced performances can be attributed to the introduction of the lithium ion conductive nanolayer and the generation of nonbonding O n species in the active material lattice, which enable rapid and effective lithium ion transport and diffusion. Our work provides a new strategy to develop high performance lithium rich cathode materials for high energy density lithium ion batteries.
author_names: Shuoqing Zhao

Bing Sun

Kang Yan

Jinqiang Zhang

Chengyin Wang

Guoxiu Wang
title: Aegis of Lithium Rich Cathode Materials via Heterostructured LiAlF4 Coating for High Performance Lithium Ion Batteries.
venue: ACS applied materials interfaces
year: 2018