中国物理B ›› 2023, Vol. 32 ›› Issue (8): 88201-088201.doi: 10.1088/1674-1056/acd2bc

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Synthesis and electrochemical performance of La2CuO4 as a promising coating material for high voltage Li-rich layered oxide cathodes

Fuliang Guo(郭福亮)1,2, Jiaze Lu(卢嘉泽)1, Meihua Su(苏美华)3, Yue Chen(陈约)1, Jieyun Zheng(郑杰允)1, Liang Yin(尹良)1,4,†, and Hong Li(李泓)1,2,3,4,‡   

  1. 1. Beijing Advanced Innovation Center for Materials Genome Engineering, Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Tianmu Lake Institute of Advanced Energy Storage Technologies, Liyang 213300, China;
    4. Yangtze River Delta Physics Research Center, Liyang 213300, China
  • 收稿日期:2023-02-11 修回日期:2023-04-24 接受日期:2023-05-05 发布日期:2023-07-14
  • 通讯作者: Liang Yin, Hong Li E-mail:lyin@iphy.ac.cn;hli@iphy.ac.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No.2019YFE0100200), the National Natural Science Foundation of China (Grant No.U1964205), and the Beijing Municipal Science and Technology Commission (Grant No.Z191100004719001).

Synthesis and electrochemical performance of La2CuO4 as a promising coating material for high voltage Li-rich layered oxide cathodes

Fuliang Guo(郭福亮)1,2, Jiaze Lu(卢嘉泽)1, Meihua Su(苏美华)3, Yue Chen(陈约)1, Jieyun Zheng(郑杰允)1, Liang Yin(尹良)1,4,†, and Hong Li(李泓)1,2,3,4,‡   

  1. 1. Beijing Advanced Innovation Center for Materials Genome Engineering, Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Tianmu Lake Institute of Advanced Energy Storage Technologies, Liyang 213300, China;
    4. Yangtze River Delta Physics Research Center, Liyang 213300, China
  • Received:2023-02-11 Revised:2023-04-24 Accepted:2023-05-05 Published:2023-07-14
  • Contact: Liang Yin, Hong Li E-mail:lyin@iphy.ac.cn;hli@iphy.ac.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No.2019YFE0100200), the National Natural Science Foundation of China (Grant No.U1964205), and the Beijing Municipal Science and Technology Commission (Grant No.Z191100004719001).

摘要: The structural transformations, oxygen releasing and side reactions with electrolytes on the surface are considered as the main causes of the performance degradation of Li-rich layered oxides (LROs) cathodes in Li-ion batteries. Thus, stabilizing the surfaces of LROs is the key to realize their practical application in high energy density Li-ion batteries. Surface coating is regarded as one of the most effective strategies for high voltage cathodes. The ideal coating materials should prevent cathodes from electrolyte corrosion and possess both electronic and Li-ionic conductivities simultaneously. However, commonly reported coating materials are unable to balance these functions well. Herein, a new type of coating material, La2CuO4 was introduced to mitigate the surface issues of LROs for the first time, due to its superb electronic conductivity (26-35 mS·cm-1) and lithium-ionic diffusion coefficient (10-12-10-13 cm2·s-1). After coating with the La2CuO4, the capacity retention of Li1.2Ni0.54Co0.13Mn0.13O2 cathode was increased to 85.9% (compared to 79.3% of uncoated cathode) after 150 cycles in the voltage range of 2.0-4.8 V. In addition, only negligible degradations on the deliverable capacity and rate capability were observed.

关键词: La2CuO4, electronic conductivity, Li-ionic conductivity, Li-rich layered oxides, high voltage

Abstract: The structural transformations, oxygen releasing and side reactions with electrolytes on the surface are considered as the main causes of the performance degradation of Li-rich layered oxides (LROs) cathodes in Li-ion batteries. Thus, stabilizing the surfaces of LROs is the key to realize their practical application in high energy density Li-ion batteries. Surface coating is regarded as one of the most effective strategies for high voltage cathodes. The ideal coating materials should prevent cathodes from electrolyte corrosion and possess both electronic and Li-ionic conductivities simultaneously. However, commonly reported coating materials are unable to balance these functions well. Herein, a new type of coating material, La2CuO4 was introduced to mitigate the surface issues of LROs for the first time, due to its superb electronic conductivity (26-35 mS·cm-1) and lithium-ionic diffusion coefficient (10-12-10-13 cm2·s-1). After coating with the La2CuO4, the capacity retention of Li1.2Ni0.54Co0.13Mn0.13O2 cathode was increased to 85.9% (compared to 79.3% of uncoated cathode) after 150 cycles in the voltage range of 2.0-4.8 V. In addition, only negligible degradations on the deliverable capacity and rate capability were observed.

Key words: La2CuO4, electronic conductivity, Li-ionic conductivity, Li-rich layered oxides, high voltage

中图分类号:  (Lithium-ion batteries)

  • 82.47.Aa
82.45.Fk (Electrodes)