Author(s)

Jing Yan¹, Wei Liu^2,3, Yuelei Wang¹, Xinxin Zhao¹, Yiming Mi¹, Haohan Liu^2,3*

¹College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China.
²Shanghai Nanotechnology Promotion Center, Shanghai, China.
³Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China.

To enhance the electrochemical performances of LiMn₂O₄ at elevated temperature (55°C), we proposed a sol-gel method to synthesize LiNi_0.5Mn_1.5O₄ modified LiMn₂O₄. The physical and electrochemical performances of pristine and LiNi_0.5Mn_1.5O₄-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 LiNi_0.5Mn_1.5O₄ 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.

LiMn₂O₄, Sol-Gel Method, Surface Coating, Electrochemical Performance

Yan, J. , Liu, W. , Wang, Y. , Zhao, X. , Mi, Y. and Liu, H. (2014) Enhanced High-Temperature Cycling Stability of LiMn₂O₄ by Coating LiNi_0.5Mn_1.5O₄. Journal of Minerals and Materials Characterization and Engineering, 2, 545-553. doi: 10.4236/jmmce.2014.26056.