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Enhanced High-Temperature Cycling Stability of LiMn2O4 by LiCoO2 Coating as Cathode Material for Lithium Ion Batteries

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http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52340#.VJJI7snQrzE

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.
Cite this paper
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. 
 

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http://dx.doi.org/10.1016/S0378-7753(03)00010-7               eww141218lx
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