Probing and suppressing voltage fade of Li-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode material for lithium-ion battery

Wei Zou, Fan Jie Xia, Jian Ping Song, Liang Wu, Liang Dan Chen, Hao Chen, Yang Liu, Wen Da Dong, Si Jia Wu, Zhi Yi Hu, Jing Liu, Hong En Wang, Li Hua Chen, Yu Li, Dong Liang Peng, Bao Lian Su

Research output: Contribution to journalArticle

Abstract

The voltage fade of Li-rich layered oxide cathode material Li1.2Ni0.13Co0.13Mn0.54O2 (LNCM) heavily hinders its application in Li-ion batteries. Herein, we revisit the origin of the voltage fade of LNCM and propose a solution to suppress this effect. It is demonstrated that the voltage fade of the LNCM cathode comes from the structural change of the crystal from layer structure to spinel structure, involving all the cations rearrangement. Such rearrangement of all the cations in LNCM is due to the high degree of delithiation and oxygen release at high cutoff voltage of 4.8 V. It is also evidenced that nickel and cobalt change from low valence to high valence at the discharged state, which not only inhibits the transport of lithium ions, but also leads to the loss of high voltage platforms. In particular, the cation rearrangement of Li/Mn causes valence change from Mn4+ to Mn3+, resulting in the decrease of discharge voltage platform at the cutoff voltage of 4.8 V much higher than at 4.6 V. The lower charge cutoff voltage can be a solution to suppress the voltage fade of LNCM cathode materials and have a good stability of LNCM cathode materials without compromising the battery performance.

Original languageEnglish
Pages (from-to)875-882
Number of pages8
JournalElectrochimica Acta
Volume318
DOIs
Publication statusPublished - 20 Sep 2019

Keywords

  • Cations rearrangement
  • Li-rich cathode material
  • Lithium-ion batteries
  • Structure change
  • Voltage fade

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    Zou, W., Xia, F. J., Song, J. P., Wu, L., Chen, L. D., Chen, H., Liu, Y., Dong, W. D., Wu, S. J., Hu, Z. Y., Liu, J., Wang, H. E., Chen, L. H., Li, Y., Peng, D. L., & Su, B. L. (2019). Probing and suppressing voltage fade of Li-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode material for lithium-ion battery. Electrochimica Acta, 318, 875-882. https://doi.org/10.1016/j.electacta.2019.06.119