Improvement of structural stability and electrochemical activity of a cathode material LiNi0.7CO0.3O2 by chlorine doping

被引：44
|
作者：
Li, Xinlu [1 ]
Kang, Feiyu [1 ]
Shen, Wanci [1 ]
Bai, Xinde [1 ]
机构：
[1] Tsing Hua Univ, Dept Mat Sci & Engn, Adv Mat Lab, Beijing 100084, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2007年 / 53卷 / 04期
基金：
中国博士后科学基金;
关键词：
anion doping; chlorine addition; cathode; Electrochemistry; lithium ion battery;
D O I：
10.1016/j.electacta.2007.08.025
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
In the process of Li+ intercalation-deintercalation, electron removal is accompanied simultaneously. Oxygen was found to compensate electron removal both in theoretical calculations and practical experiments. Chlorine addition to LiNi0.7CO0.3O2 was expected to exchange electrons in that Cl- was easier to lose electrons than O2-. LiNi0.7CO0.3O2-xClx was identified as a pure hexagonal lattice of alpha-NaFeO2 type by X-ray diffraction. X-ray photoelectron spectroscopy was used to analyze the influence of chlorine substitution on the oxidation state of transition-metal ions. Charge-discharge experiments and cyclic voltarnmetry confirmed that chlorine addition was an effective way to improve reversible capacity and structural stability in cycles. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1761 / 1765
页数：5
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