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Enhanced High-Temperature Cycling Stability of LiMn<SUB>2</SUB>O<SUB>4</SUB> by LiCoO<SUB>2</SUB> Coating as Cathode Material for Lithium Ion Batteries
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China
Shanghai Nanotechnology Promotion Center, Shanghai, China
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China
Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China
- 1 College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China
- 2 Shanghai Nanotechnology Promotion Center, Shanghai, China
- 3 College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China
- 4 College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China
- 5 College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China
- 6 Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China
Journal of Materials Science and Chemical Engineering·Volume 02 (2014)·Pages 12–18·Published 5 December 2014·DOI10.4236/msce.2014.212003
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Abstract
LiCoO 2 surface layer is proposed and prepared through sol-gel method. The physical and electrochemical performances of pristine LiMn 2 O 4 and LiCoO 2 -coated LiMn 2 O 4 cathode materials were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, electrochemical measurements respectively. Comparing with the pristine LiMn 2 O 4 , the LiCoO 2 - coated LiMn 2 O 4 phase significantly improved cycling stability, especially at 55°C. Additionally, the thermal safety of LiMn2O 4 is greatly enhanced after being coated by LiCoO 2 . ICP-AES measurement, structural analysis, and impedance experiments indicate that the improved electrochemical property of LiCoO 2 -coated LiMn 2 O 4 should be attributed to the alleviated dissolution loss of manganese, strengthened structural stability.
KeywordsLiMn<SUB>2</SUB>O<SUB>4</SUB>Sol-Gel MethodSurface CoatingElectrochemical Performance
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