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

来源：

ELECTROCHIMICA ACTA | 2005年 / 50卷 / 20期

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

页码：4057 / 4062

页数：6