J. Mater. Sci. Technol. ›› 2006, Vol. 22 ›› Issue (04): 433-436.

• Research Articles •     Next Articles

Electrochemical Performance of Surface-Modified LiMn2O4 Prepared by a Melting Impregnation Method

Jian TU, Xinbing ZHAO, Gaoshao CAO, Tiejun ZHU, Dagao ZHUANG, Jiangping TU   

  1. State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
  • Received:2005-12-14 Revised:2006-03-03 Online:2006-07-28 Published:2009-10-10
  • Contact: Xinbing ZHAO

Abstract:

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 dified 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.

Key words: LiMn2O4 spinel, Surface modification, Melting impregnation, Cathode materials, Lithium-ion batteries