文献类型：期刊文献

英文题名：Synthesis and electrochemical performance of F-doped Li4Ti5O12 for lithium-ion batteries

作者：Zhao, Zhen[1];Xu, Yunlong[1];Ji, Mandi[1];Zhang, Huang[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2013

卷号：109

起止页码：645

外文期刊名：ELECTROCHIMICA ACTA

收录：;EI(收录号：20133916791389);WOS:【SCI-EXPANDED(收录号:WOS:000328006300088)】；

基金：The work is supported by Shanghai Nanotechnology Special Foundation (No. 11nm0500900).

语种：英文

外文关键词：Li4Ti5O12; F-doped; Electrochemical properties; Lithium-ion battery

摘要：F-doped Li4Ti5O12 anode materials in the form of Li4Ti5O12-xFx (0 <= x <= 0.5) are synthesized successfully via a solid-state reaction. The structure and electrochemical properties of the as-prepared powders are investigated. The Li4Ti5O12-xFx (x = 0.3) sample exhibits an outstanding electrochemical performance among all the samples in a potential range from 0.01 to 2.5 V, and delivers higher discharge capacity and better long-term cycling stability compared with the pristine Li4Ti5O12. The initial specific discharge capacity is 234.5 mAh g(-1) at a density of 85 mA g(-1), and remains about 138 mAh g(-1) over 500 cycles when the current density increases to 340 mA g(-1). The excellent electrochemical performance could be attributed to the substitution of F- into O2- site, which can increase the amount of Ti3+/Ti4+ mixing as charge compensation, leading to the decrease of the charge transfer resistance and improvement of the lithium ion diffusion in Li4Ti5O12-xFx. (C) 2013 Elsevier Ltd. All rights reserved.