Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (5): 1514.doi: 10.7503/cjcu20200489

• Review • Previous Articles     Next Articles

Coating Strategies of Ni-rich Layered Cathode in LIBs

WANG Yimeng, LIU Kai(), WANG Baoguo   

  1. Department of Chemical Engineering,Tsinghua University,Beijing 100084,China
  • Received:2020-07-23 Online:2021-05-10 Published:2020-11-27
  • Contact: LIU Kai E-mail:liukai2019@tsinghua.edu.cn
  • Supported by:
    Supported by the National Key Research and Development Program, China(2019YFC0810703);the Tsinghua?Foshan Innovation Special Fund(TFISF), China(2019THFS0128)

Abstract:

With the exhaustion of traditional energy resources and the emergence of environmental problems, lithium ion battery has gradually become a widely used energy storage system due to its higher volume/weight energy density, longer service life, lower self-discharge rate and other advantages. Compared with the traditional cathode such as LiCoO2, LiFePO4etc, Nickel-rich layered cathode Li[Ni1-x-yCoxMny]O2(NCM) has become the most preferred cathode materials for due to its advantages of high voltage and high capacity. Although NCM cathode material has the advantages mentioned above, it still faces the problems of cycle stability, rate capability and safety issues before further practical application. These performance deficiencies come from the unstable crystal structure of the NCM material, the side reaction on the positive electrode-electrolyte interface, the high interface resistance and so on. To solve these problems, a lot of work has been done to optimize the electrochemical properties of nickel-rich cathode, which is almost studied around the electrode-electrolyte interface. In this review, we summarized the degradation mechanism of capacity battery performance with NCM cathode, and the optimizing strategy of NCM cathode. And then, main coating strategies including electrochemical inactive coating, li-reactive coating, lithium-ion conductive coating are discussed. On this basis, we summarized the ideas and effects of various surface coating strategies, and finally proposed the prospect about the development of NCM cathode materials.

Key words: Lithium-ion battery, Nickel-rich layered cathode material, Surface coating, Solid-liquid interface

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