JMMCE  Vol.2 No.6 , November 2014
Enhanced High-Temperature Cycling Stability of LiMn2O4 by Coating LiNi0.5Mn1.5O4
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&degC compared to the pristine one, which was attributed to the suppression of electrolyte decomposition and the reduction of Mn dissolution.

Cite this paper
Yan, J. , Liu, W. , Wang, Y. , Zhao, X. , Mi, Y. and Liu, H. (2014) Enhanced High-Temperature Cycling Stability of LiMn2O4 by Coating LiNi0.5Mn1.5O4. Journal of Minerals and Materials Characterization and Engineering, 2, 545-553. doi: 10.4236/jmmce.2014.26056.
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