Electrochemical Performance of CoAl₂O₄-Coated LiNi_1/3Co_1/3Mn_1/3O₂

Authors

Ji-jun CAI, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Wang-jun CUI, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;Follow
Bing LI, College of Energy, Xiamen University, Xiamen 361005, Fujian, China;
Yang-yang YU, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Jin-bao ZHAO, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;College of Energy, Xiamen University, Xiamen 361005, Fujian, China;Follow

Corresponding Author

Wang-jun CUI(wjcui@xmu.edu.cn);
Jin-bao ZHAO(jbzhao@xmu.edu.cn)

Abstract

A method to improve the electrochemical performance of LiNi_1/3Co_1/3Mn_1/3O₂ for high voltage lithium-ion battery by CoAl₂O₄ coating was present in this work. The effects of CoAl₂O₄ coatings on the structure and electrochemical properties of LiNi1/3Co1/3Mn1/3O2 were investigated in detail. The results show that CoAl₂O₄ forms a thin layer of 8 nm on the surface of LiNi_1/3Co_1/3Mn_1/3O₂ without destroying the structure of the core material. The CoAl₂O₄-coated LiNi_1/3Co_1/3Mn_1/3O₂ possesses better rate capability and cycle performance than the uncoated sample. The excellent cycling performance can be obtained even with 1% (by mass) CoAl₂O₄ coating, for example, the capacity retentions at the 100th cycle increase from 74.4% to 93.7% at room temperature, and 17.7% to 77% at 55 °C, respectively. It was also confirmed that the CoAl₂O₄ coating could depress Mn ions dissolving into the electrolyte, and could lead to the enhancement in the structural stability and the thermal stability of LiNi_1/3Co_1/3Mn_1/3O₂, suggesting that the CoAl₂O₄ coating is an efficient way to improve the electrochemical performance of LiNi_1/3Co_1/3Mn_1/3O₂.

Graphical Abstract

Keywords

lithium-ion battery, LiNi1/3Co1/3Mn1/3O2, electrochemical performance, CoAl2O4 coating

DOI Link

https://doi.org/10.13208/j.electrochem.141043

Publication Date

2015-04-28

Online Available Date

2014-12-31

Revised Date

2014-12-22

Received Date

2014-10-26

Recommended Citation

Ji-jun CAI, Wang-jun CUI, Bing LI, Yang-yang YU, Jin-bao ZHAO. Electrochemical Performance of CoAl₂O₄-Coated LiNi_1/3Co_1/3Mn_1/3O₂[J]. Journal of Electrochemistry, 2015 , 21(2): 145-151.
DOI: 10.13208/j.electrochem.141043
Available at: https://jelectrochem.xmu.edu.cn/journal/vol21/iss2/6