TITLE:
Enhanced High-Temperature Cycling Stability of LiMn2O4 by Coating LiNi0.5Mn1.5O4
AUTHORS:
Jing Yan, Wei Liu, Yuelei Wang, Xinxin Zhao, Yiming Mi, Haohan Liu
KEYWORDS:
LiMn2O4, Sol-Gel Method, Surface Coating, Electrochemical Performance
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.2 No.6,
November
3,
2014
ABSTRACT: To enhance the electrochemical performances of LiMn2O4 at elevated temperature (55°C), we proposed a sol-gel method to synthesize LiNi0.5Mn1.5O4 modified LiMn2O4. The physical and electrochemical performances of pristine and LiNi0.5Mn1.5O4-coated LiMn2O4 cathode materials were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and electrochemical measurements, respectively. The results indicated that about 4-5 nm thick layer of LiNi0.5Mn1.5O4 was formed on the surface of the LiMn2O4 powders. The modified LiMn2O4 exhibited excellent storage performance at 55°C compared to the pristine one, which was attributed to the suppression of electrolyte decomposition and the reduction of Mn dissolution.