电化学
铬
X射线光电子能谱
结构精修
离子
降水
化学
材料科学
分析化学(期刊)
无机化学
电极
冶金
结晶学
化学工程
晶体结构
物理化学
工程类
气象学
物理
有机化学
色谱法
作者
Lingjun Li,Zhixing Wang,Qicheng Liu,Chang Yé,Zhaoyong Chen,Li Gong
标识
DOI:10.1016/j.electacta.2012.05.076
摘要
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.
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