期刊
ELECTROCHIMICA ACTA
卷 77, 期 -, 页码 89-96出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.05.076
关键词
Lithium ion battery; Positive material; LiNi0.8Co0.1Mn0.1O2; Cr substitution; Surface chemistry
资金
- National Basic Research Program of China (973 Program) [2007CB613607]
- Science and Technology Project of Hunan Province [2011GK3121]
Single phase LiNi0.8-xCo0.1Mn0.1CrxO2 (x = 0, 0.01, 0.02, and 0.03) compounds have been prepared by fast co-precipitation and anneal method. Electrochemical tests show that the sample b, with 1% Cr content, exhibits the highest discharge capacity, enhanced rate ability and cycling property among all samples. From the combination of Rietveld refinements, ICP, EDAX and XPS studies, it is supposed that the electrochemical improvement may be related to the suppressed cation mixing degree and reduced surface concentration of Ni ions, caused by Cr substitution. However, excess Cr substitution could also result in the appearance of Cr6+ and Mn3+ ions, which are mainly responsible for the capacity fading of positive materials. Therefore, Cr substitution should be controlled in reasonable range. (C) 2012 Elsevier Ltd. All rights reserved.
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