期刊
ELECTROCHIMICA ACTA
卷 51, 期 28, 页码 6406-6411出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2006.04.054
关键词
LiMn2O4; TiO2 modification; high-potential stability; elevated-temperature stability; differential capacity-potential
The surface of spinel LiMn2O4 was modified with TiO2 by a simple sol-gel method to improve its electrochemical performance at elevated temperatures and higher working potentials. Compared with pristine LiMn2O4, surface-modification improved the cycling stability of the material. The capacity retention of Tio(2)-modified LiMn2O4 was more than 85% after 60 cycles at high potential cycles between 3.0 and 4.8 V at room temperature and near to 90% after 30 cycles at elevated temperature of 55 degrees C at 1C charge-discharge rate. SEM studies shows that the surface morphology of TiO2-modified LiMn2O4 was different from that of pristine LiMn2O4. Powder X-ray diffraction indicated that spinel was the only detected phase in TiO2-modified LiMn2O4. Introduction of Ti into LiMn2O4 changed the electronic structures of the particle surface. Therefore a surface solid compound of LiTixMn2-xO4 may be formed on LiMn2O4. The improved electrochemical performance of surface-modified LiMn2O4 was attributed to the improved stability of crystalline structure and the higher Li+ conductivity. (c) 2006 Elsevier Ltd. All rights reserved.
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