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Enhanced High-Temperature Cycling Stability of LiMn<sub>2</sub>O<sub>4</sub> by Coating LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub>
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 Minerals and Materials Characterization and Engineering·Volume 02 (2014)·Pages 545–553·Published 3 November 2014·DOI10.4236/jmmce.2014.26056
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Abstract
To enhance the electrochemical performances of LiMn 2 O 4 at elevated temperature (55°C), we proposed a sol-gel method to synthesize LiNi 0.5 Mn 1.5 O 4 modified LiMn 2 O 4 . The physical and electrochemical performances of pristine and LiNi 0.5 Mn 1.5 O 4 -coated LiMn 2 O 4 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 LiNi 0.5 Mn 1.5 O 4 was formed on the surface of the LiMn 2 O 4 powders. The modified LiMn 2 O 4 exhibited excellent storage performance at 55°C compared to the pristine one, which was attributed to the suppression of electrolyte decomposition and the reduction of Mn dissolution.
KeywordsLiMn<sub>2</sub>O<sub>4</sub>Sol-Gel MethodSurface CoatingElectrochemical Performance
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