Probing and suppressing voltage fade of Li-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode material for lithium-ion battery
Probing and suppressing voltage fade of Li-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode material for lithium-ion battery
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锂离子电池富锂Li1.2Ni0.13Co0.13Mn0.54O2正极材料的探索及抑制电压衰减
DOI：
10.1016/j.electacta.2019.06.119
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发表时间：
2019-09
影响因子：
6.6
通讯作者：
Su Bao-Lian
中科院分区：
文献类型：
--
作者：
Zou Wei;Xia Fan-Jie;Song Jian-Ping;Wu Liang;Chen Liang-Dan;Chen Hao;Liu Yang;Dong Wen-Da;Wu Si-Jia;Hu Zhi-Yi;Liu Jing;Wang Hong-En;Chen Li-Hua;Li Yu;Peng Dong-Liang;Su Bao-Lian
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.
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