Study on Modification of spinel LiMn₂O₄ by Overcoating

Authors

Ren-gang ZHANG, Stata Labo. of Advanced Techn. for Materials synthesis and processing, Wuhan Univ. of Techn., Wuhan 430070, ChinaFollow
Shi-xi ZHAO, Stata Labo. of Advanced Techn. for Materials synthesis and processing, Wuhan Univ. of Techn., Wuhan 430070, China
Jung-lei XIA, Stata Labo. of Advanced Techn. for Materials synthesis and processing, Wuhan Univ. of Techn., Wuhan 430070, China
Han-xing LIU, Stata Labo. of Advanced Techn. for Materials synthesis and processing, Wuhan Univ. of Techn., Wuhan 430070, China

Corresponding Author

Ren-gang ZHANG(liuhx@mail.whut.edu.cn)

Abstract

The surface of spinel LiMn₂O₄ was modified by the sol-gel process with LiCoO₂-coated LiMn₂O₄ 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 Co³⁺ 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 Mn²⁺ solving in electrolyte decreased, Jahn-Teller effect was suppressed to a certain extent. The LiCoO₂-coated LiMn₂O₄ showed better cycling performance than the bare spinel LiMn₂O₄.

Keywords

Spinel LiMn2O4, Sol-gel, Surface coating, Cycling performance

DOI Link

https://doi.org/10.61558/2993-074X.3296

Publication Date

2002-08-28

Online Available Date

2002-08-28

Revised Date

2002-01-21

Received Date

2001-10-12

Recommended Citation

Ren-gang ZHANG, Shi-xi ZHAO, Jung-lei XIA, Han-xing LIU. Study on Modification of spinel LiMn₂O₄ by Overcoating[J]. Journal of Electrochemistry, 2002 , 8(3): 269-274.
DOI: 10.61558/2993-074X.3296
Available at: https://jelectrochem.xmu.edu.cn/journal/vol8/iss3/11