Abstract
The surface of spinel LiMn 2O 4 was modified by the sol_gel process with LiCoO 2_coated LiMn 2O 4 and studied by XRD,SEM and EPMA.The results have shown that the surface of the coated grains heated at 700 ℃ for 10h,which is cubic spinel,were Co_rich.The amount of Co 3+ in the grains changed owing to different place of the grain and decreased from surface to inner parts. Using the coated as the cathode of Li_ion cells,the initial capacity deceased slightly,but the amount of Mn 2+ solving in electrolyte decreased,Jahn_Teller effect was suppressed to a certain extent.The LiCoO 2_coated LiMn 2O 4 showed better cycling performance than the bare spinel LiMn 2O 4.
Keywords
Spinel LiMn 2O 4, Sol_gel, Surface coating, Cycling performance
Publication Date
2002-08-28
Online Available Date
2002-08-28
Revised Date
2002-08-28
Received Date
2002-08-28
Recommended Citation
Ren-gang ZHANG, Shi-xi ZHAO, Jung-lei XIA, Han-xing LIU.
Study on Modification of spinel LiMn_2O_4 by Overcoating[J]. Journal of Electrochemistry,
2002
,
8(3): Article 11.
DOI: 10.61558/2993-074X.3296
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol8/iss3/11
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