Abstract
To enhance the electrochemical performances of LiMn2O4 at elevated temperature, we proposed a sol–gel method to synthesize LiNi1/3Co1/3Mn1/3O2-modified LiMn2O4. The physical and electrochemical performances of pristine and LiNi1/3Co1/3Mn1/3O4-coated LiMn2O4 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 5–6-nm-thick layer of LiNi1/3Co1/3Mn1/3O2 formed on the surface of the LiMn2O4 powders. The modified LiMn2O4 exhibited excellent storage performance at 45, 55, and 65 °C compared to the pristine one, which was attributed to the suppression of electrolyte decomposition and the reduction of Mn dissolution.
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This work was supported by the National Science Foundation of China (No. 50672026). This work was also supported by the Shanghai Nanotechnology Promotion Center (No. 12ZR1448800)
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LiNi1/3Co1/3Mn1/3O2 is a new coating material on LiMn2O4. A uniform and dense layer about 5–6 nm was formed on the surface of LiMn2O4. The LiNi1/3Co1/3Mn1/3O2 coating layer significantly improves the high-temperature cycling stability of LiMn2O4.
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Yan, J., Liu, H., Wang, Y. et al. Enhanced high-temperature cycling stability of LiNi1/3Co1/3Mn1/3O2-coated LiMn2O4 as cathode material for lithium ion batteries. Ionics 21, 1835–1842 (2015). https://doi.org/10.1007/s11581-015-1371-9
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DOI: https://doi.org/10.1007/s11581-015-1371-9