Electrochemical Performance of Surface-Modified LiMn_2O_4 Prepared by a Melting Impregnation Method  

作　　者：Jian TU Xinbing ZHAO Gaoshao CAO Tiejun ZHU Dagao ZHUANG diangping TU 

机构地区：[1]State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China

出　　处：《Journal of Materials Science & Technology》2006年第4期433-436,共4页材料科学技术（英文版）

摘　　要：The surface of as-prepared LiMn2O4 was modified with ZnO, Al2O3, CoO and LiCoO2 using a simple nitrate melting impregnation method. Transmission electron microscopy （TEM） studies indicated that oxide nano- particles in the range of 10～50 nm are coated on the surface of the spinel. The surface modified samples show better capacity retention than the unmodified LiMn2O4 spinel at both room temperature and 55℃. Among these samples, the ZnO-modified LiMn2O4 shows the best combination of a high capacity and a low capacity fading rate of 0.036% per cycle at room temperature and 0.064% per cycle at 55℃. The improvement for surface modified LiMn2O4 can be attributed to the inhibition of Mn dissolution and O losses on the surface.The surface of as-prepared LiMn2O4 was modified with ZnO, Al2O3, CoO and LiCoO2 using a simple nitrate melting impregnation method. Transmission electron microscopy （TEM） studies indicated that oxide nano- particles in the range of 10～50 nm are coated on the surface of the spinel. The surface modified samples show better capacity retention than the unmodified LiMn2O4 spinel at both room temperature and 55℃. Among these samples, the ZnO-modified LiMn2O4 shows the best combination of a high capacity and a low capacity fading rate of 0.036% per cycle at room temperature and 0.064% per cycle at 55℃. The improvement for surface modified LiMn2O4 can be attributed to the inhibition of Mn dissolution and O losses on the surface.

关 键 词：LiMn2O4 spinel Surface modification Melting impregnation Cathode materials Lithium-ion batteries 

分 类 号：TM912.2[电气工程—电力电子与电力传动] O646.541[理学—物理化学]