Electrochemical Performance of Li1.2Mn0.54Co0.13Ni0.13O2 Cathode Materials Modified by NaH2PO2

被引：0
|
作者：
Cao J. [1 ]
Qu Y. [1 ]
Yang Z. [1 ]
Chen Z. [1 ]
Zhang W. [1 ]
机构：
[1] School of Chemistry and Chemical Engineering, Hefei University of Technology, Anhui Key Laboratory Controllable Chemistry Reaction Material Chemical Engineering, Hefei
来源：
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2021年 / 49卷 / 10期
关键词：
Lithium-ion battery; Lithium-rich cathode material; Sodium hypophosphite;
D O I：
10.14062/j.issn.0454-5648.20210119
中图分类号：
学科分类号：
摘要：
Different amounts of NaH2PO2 were used to treat lithium-rich cathode materials. The results show that the material treated by 4% (in mass fraction) NaH2PO2 exhibits an excellent cycle stability with 85.3% of capacity retention after 150 cycles at 0.5 C and a high Coulombic efficiency. The enhanced electrochemical performance is attributed to the two following aspects. One aspect is that NaH2PO2 pyrolysis produces reducing PH3 gas, which reacts with the active oxygen in the surface layer of the lithium-rich cathode materials to yield oxygen vacancy, thus effectively reducing the irreversible capacity loss in the first charge process. Another is that NaH2PO2 pyrolysis treatment induces Na+ doping, which can effectively stabilize the lattice structure and inhibit phase transition, and accelerate Li+ diffusion and reduce the electrochemical impedance. In addition, the formed Na4P2O7 coating can protect the electrode material and reduce the dissolution of the transition metal, thereby improving the cycle stability. © 2021, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.
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页码：2144 / 2153
页数：9
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