期刊
ELECTROCHIMICA ACTA
卷 56, 期 18, 页码 6562-6567出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.02.093
关键词
Lithium ion battery; Cathode material; Sol-gel; Li9V3-xCrx(P2O7)(3)(PO4)(2)
资金
- NSFC [50972046]
- NSFC Committee of China
- SCUT [2009ZM0022]
Cr-doped Li9V3-xCrx(P2O7)(3)(PO4)(2) (x = 0.0-0.5) compounds have been prepared using sol-gel method. The Rietveld refinement results indicate that single-phase Li9V3-xCrx(P2O7)(3)(PO4)(2) (x=0.0-0.5) with trigonal structure can be obtained. Although the initial specific capacity decreased with Cr content at a lower current rate, both cycle performance and rate capability have excited improvement with moderate Cr-doping content. Li9V3-xCrx(P2O7)(3)(PO4)(2) compound presents the good electrochemical rate and cyclic ability. The enhancement of rate and cyclic capability may be attributed to the optimizing particle size, morphologies, and structural stability during the proper amount of Cr-doping (x = 0.2) in V sites. (C) 2011 Elsevier Ltd. All rights reserved.
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