Abstract
A method to improve the electrochemical performance of LiNi1/3Co1/3Mn1/3O2 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 LiNi1/3Co1/3Mn1/3O2 without destroying the structure of the core material. The CoAl2O4-coated LiNi1/3Co1/3Mn1/3O2 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 LiNi1/3Co1/3Mn1/3O2, suggesting that the CoAl2O4 coating is an efficient way to improve the electrochemical performance of LiNi1/3Co1/3Mn1/3O2.
Graphical Abstract
Keywords
lithium-ion battery, LiNi1/3Co1/3Mn1/3O2, electrochemical performance, CoAl2O4 coating
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 LiNi1/3Co1/3Mn1/3O2[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
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