期刊
CERAMICS INTERNATIONAL
卷 45, 期 14, 页码 18106-18110出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.05.216
关键词
Lithium ion battery; LiF additive; Self-discharge behavior; Residual current; Enhanced electrochemical performance; LiNi0.6Co0.2Mn0.2O2
资金
- Government of Chongzuo, Guangxi Zhuang Autonomous Region (GC Joint Specil Fund) [[2017]11]
- Science and Technology Department of Guangxi Zhuang Autonomous Region (Gangxi Special Fund for Scientific Center and Talent Resources) [2018AD15002]
High working potential and temperature put nonnegligible threats on electrochemical stability and safety performance of lithium ion batteries (LIBs). In this paper the carbonate-based electrolyte is modified with LiF additive to improve the comprehensive properties of cells in which a metallic lithium anode is paired with a LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode under the extreme conditions of high cut-off potential, high current rate or even high temperature (55 degrees C). The tests of self-discharge behavior and chronoamperometry present that the introduction of LiF additive contributes to relieving self-discharge of cells and side reactions on the surface of electrodes. The cells with 100 ppm exhibit the improved cyclic performance (81.6% of initial capacity 195.4 mAh g(-1)), high-rate capability (150.6 mAh g(-1) at 8 C) and high-temperature performance. Additionally after 100 cycles over 3.0-4.6 V, the results of X-ray diffraction (XRD) and scanning electron microscopy (SEM) on electrodes reveal that the cathodes in LiF-reinforced electrolyte retain more stable layered structure and more intact spherical secondary particles than those in original electrolyte.
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