期刊
JOURNAL OF POWER SOURCES
卷 189, 期 2, 页码 1147-1153出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2008.12.152
关键词
Lithium-ion battery; Cathode material; Spinel; Surface coating; Co-Al mixed metal oxide
资金
- National Natural Science Foundation of China
- Ministry of Science and Technology High Technology Development (863) Plan [2006AA03Z343]
- 111 Project [B07004]
Co-Al mixed metal oxide (CoAl-MMO) has been used for surface modification of LiMn2O4 spinel by means of a co-precipitation method in an attempt to improve the electrochemical performance of LiMn2O4 at elevated temperature. The surface modified materials were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectrometry (EDS), Auger electron spectroscopy (AES) and galvanostatic charge-discharge cycling. After heat-treatment at 400 degrees C. the CoAl-MMO coated LiMn2O4 shows better capacity retention at both 25 degrees C and 55 degrees C than the pristine LiMn2O4. The enhancement in electrochemical performance is mainly attributed to the CoAl-MMO coating layer which has the synergistic effect of cobalt and aluminum oxide species and could block the direct contact between the spinel cathode material and electrolyte resulting in Mn dissolution decrease. (C) 2009 Elsevier B.V. All rights reserved.
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