TITLE:
Enhanced High-Temperature Cycling Stability of LiMn2O4 by LiCoO2 Coating as Cathode Material for Lithium Ion Batteries
AUTHORS:
Jing Yan, Haohan Liu, Yuelei Wang, Xinxin Zhao, Yiming Mi, Baojia Xia
KEYWORDS:
LiMn2O4, Sol-Gel Method, Surface Coating, Electrochemical Performance
JOURNAL NAME:
Journal of Materials Science and Chemical Engineering,
Vol.2 No.12,
December
17,
2014
ABSTRACT: LiCoO2 surface layer is proposed and prepared through sol-gel method. The physical and electrochemical
performances of pristine LiMn2O4 and LiCoO2-coated LiMn2O4 cathode materials were
investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy,
electrochemical measurements respectively. Comparing with the pristine LiMn2O4, the LiCoO2-
coated LiMn2O4 phase significantly improved cycling stability, especially at 55°C. Additionally, the
thermal safety of LiMn2O4 is greatly enhanced after being coated by LiCoO2. ICP-AES measurement,
structural analysis, and impedance experiments indicate that the improved electrochemical
property of LiCoO2-coated LiMn2O4 should be attributed to the alleviated dissolution loss of manganese,
strengthened structural stability.