Author(s)

Jing Yan¹, Haohan Liu^2,3, Yuelei Wang¹, Xinxin Zhao¹, Yiming Mi^1*, Baojia Xia³

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.

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.

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

Yan, J. , Liu, H. , Wang, Y. , Zhao, X. , Mi, Y. and Xia, B. (2014) Enhanced High-Temperature Cycling Stability of LiMn₂O₄ by LiCoO₂ Coating as Cathode Material for Lithium Ion Batteries. Journal of Materials Science and Chemical Engineering, 2, 12-18. doi: 10.4236/msce.2014.212003.