Preparation and cycling performance of Al3+ and F- co-substituted compounds Li4AlxTi5-xFyO12-y

被引:137
作者
Huang, SH [1 ]
Wen, ZY [1 ]
Gu, ZH [1 ]
Zhu, XJ [1 ]
机构
[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China
基金
中国国家自然科学基金;
关键词
lithium secondary batteries; electrochemical performance; doping; Li4Ti5O12; Li4AlxTi5-xFyO12-y;
D O I
10.1016/j.electacta.2004.12.036
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Li4AlxTi5-xFyO12-y compounds were prepared by a solid-state reaction method. Phase analyses demonstrated that both Al3+ and F- ions entered the structure of spinel-type Li4Ti5O12. Charge-discharge cycling results at a constant current density of 0.15 mA cm(-2) between the cutoff voltages of 2.5 and 0.5 V showed that the Al3+ and F- substitutions improved the first total discharge capacity of Li4Ti5O12. However, Al3+ substitution greatly increased the reversible capacity and cycling stability of Li4Ti5O12.While F-substitution decreased its reversible capacity and cycling stability slightly. The electrochemical performance of the Al3+-F--co-substituted specimen was better than the F--substituted one but worse than the Al3+-substituted one. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:4057 / 4062
页数:6
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