Energy Storage Science and Technology ›› 2019, Vol. 8 ›› Issue (6): 1003-1016.doi: 10.12028/j.issn.2095-4239.2019.0111

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Failure mechanism of Li1+x(NCM)1-xO2 layered oxide cathode material during capacity degradation

CHEN Xiaoxuan1, LI Sheng1, HU Yonggang1, ZHENG Shiyao1, CHAI Yunxuan1, LI Dongjiang2, ZUO Wenhua1, ZHANG Zhongru1, YANG Yong1   

  1. 1 Collaborative Innovation Center of Chemistry for Energy Materials, State Key Lab of Physical Chemistry of Solid Surface, Department of Chemical and Biological Engineering and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
    2 Forschungszentrum Jülich, Fundamental Electrochemistry(IEK-9), D-52425 Jülich, Germany
  • Received:2019-05-02 Revised:2019-06-10 Online:2019-11-01 Published:2019-11-01

Abstract: Ternary layered oxide (NCM) cathode materials are widely used in today's energy storage systems (ESS) due to their advantages of high energy/power density, high specific capacity and high oxidation-reduction potential (ORP). Cathode material specific capacity increases with the improvement of Ni content while its stability, safety and capacity retention rate are decreasing. So how to deal with this contradiction effectively is the key to develop ternary material system. This paper starts from the failure phenomenon on account of bulk phase structure destruction and cathodeelectrolyte interface composition change during the cycle of NCM battery system. Combined with the new theory, new method and new application in the research of NCM failure mode at home and abroad in recent years, the possible decline mechanism and life decay reasons of mechanical damage, structural evolution, electrochemical polarization, chemical side reaction process and synergistic effect of cathode and anode electrodes are giving. The results guide users to rationally formulate charging and discharging protocols and alleviate electric vehicles (EV) range anxiety and the design of the material.

Key words: lithium ion batteries, NCM cathode material, failure behavior, ageing mechanism, surface and interface, bulk structure

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