中国物理B ›› 2019, Vol. 28 ›› Issue (6): 68202-068202.doi: 10.1088/1674-1056/28/6/068202

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Improved electrochemical performance of Li(Ni0.6Co0.2Mn0.2)O2 at high charging cut-off voltage with Li1.4Al0.4Ti1.6(PO4)3 surface coating

Yi Wang(王怡), Bo-Nan Liu(刘柏男), Ge Zhou(周格), Kai-Hui Nie(聂凯会), Jie-Nan Zhang(张杰男), Xi-Qian Yu(禹习谦), Hong Li(李泓)   

  1. 1 Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
    3 IOPSILION Co., Ltd., Liyang 213300, China
  • 收稿日期:2019-02-19 修回日期:2019-03-18 出版日期:2019-06-05 发布日期:2019-06-05
  • 通讯作者: Jie-Nan Zhang, Xi-Qian Yu E-mail:jnzhang@iphy.ac.cn;xyu@iphy.ac.cn
  • 基金资助:

    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFB0102004), the National Natural Science Foundation of China (Grant No. 51822211), and the State Grid Technology Project, China (Grant No. DG71-17-010).

Improved electrochemical performance of Li(Ni0.6Co0.2Mn0.2)O2 at high charging cut-off voltage with Li1.4Al0.4Ti1.6(PO4)3 surface coating

Yi Wang(王怡)1,2, Bo-Nan Liu(刘柏男)3, Ge Zhou(周格)1,2, Kai-Hui Nie(聂凯会)1,2, Jie-Nan Zhang(张杰男)1, Xi-Qian Yu(禹习谦)1,2, Hong Li(李泓)1,2,3   

  1. 1 Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
    3 IOPSILION Co., Ltd., Liyang 213300, China
  • Received:2019-02-19 Revised:2019-03-18 Online:2019-06-05 Published:2019-06-05
  • Contact: Jie-Nan Zhang, Xi-Qian Yu E-mail:jnzhang@iphy.ac.cn;xyu@iphy.ac.cn
  • Supported by:

    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFB0102004), the National Natural Science Foundation of China (Grant No. 51822211), and the State Grid Technology Project, China (Grant No. DG71-17-010).

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摘要：

Li(Ni0.6Co0.2Mn0.2)O2 has been surface-modified by the lithium-ion conductor Li1.4Al0.4Ti1.6(PO4)3 via a facile mechanical fusion method. The annealing temperature during coating process shows a strong impact on the surface morphology and chemical composition of Li(Ni0.6Co0.2Mn0.2)O2. The 600-℃ annealed material exhibits the best cyclic stability at high charging cut-off voltage of 4.5 V (versus Li+/Li) with the capacity retention of 90.9% after 100 cycles, which is much higher than that of bare material (79%). Moreover, the rate capability and thermal stability are also improved by Li1.4Al0.4Ti1.6(PO4)3 coating. The enhanced performance can be attributed to the improved stability of interface between Li(Ni0.6Co0.2Mn0.2)O2 and electrolyte by Li1.4Al0.4Ti1.6(PO4)3 modification. The results of this work provide a possible method to design reliable cathode materials to achieve high energy density and long cycle life.

关键词: lithium-ion batteries, cathode, Ni-rich oxide, solid electrolyte, coating

Abstract:

Li(Ni0.6Co0.2Mn0.2)O2 has been surface-modified by the lithium-ion conductor Li1.4Al0.4Ti1.6(PO4)3 via a facile mechanical fusion method. The annealing temperature during coating process shows a strong impact on the surface morphology and chemical composition of Li(Ni0.6Co0.2Mn0.2)O2. The 600-℃ annealed material exhibits the best cyclic stability at high charging cut-off voltage of 4.5 V (versus Li+/Li) with the capacity retention of 90.9% after 100 cycles, which is much higher than that of bare material (79%). Moreover, the rate capability and thermal stability are also improved by Li1.4Al0.4Ti1.6(PO4)3 coating. The enhanced performance can be attributed to the improved stability of interface between Li(Ni0.6Co0.2Mn0.2)O2 and electrolyte by Li1.4Al0.4Ti1.6(PO4)3 modification. The results of this work provide a possible method to design reliable cathode materials to achieve high energy density and long cycle life.

Key words: lithium-ion batteries, cathode, Ni-rich oxide, solid electrolyte, coating

中图分类号:  (Lithium-ion batteries)

  • 82.47.Aa
82.45.Fk (Electrodes)