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Enhanced cycle stability of spinel LiMnO by a melting impregnation
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| QI Hao, CAO Gao-shao, XIE Jian, ZHAO Xin-bing |
| State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University |
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Abstract Spinel LiMn2O4 particles were successfully coated with CuO, MgO, ZnO, Al2O3 and CeO2 by a melting impregnation method. Except for the CeO2-coated sample, all the others exhibit better cycling stability than bare LiMn2O4 at room temperature and at 55°C. Among these samples, the ZnO-coated sample shows the best cycling stability. A capacity of 100 mA·h·g-1 still remained after 100 cycles at 55°C while the bare LiMn2O4 retains a capacity of only 80 mA·h·g-1 after the same number of cycles. The improvement in the cycling stability is attributed to the suppressed Mn dissolution caused by HF.
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Issue Date: 05 September 2008
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