物理化学学报 >> 2004, Vol. 20 >> Issue (07): 707-711.doi: 10.3866/PKU.WHXB20040708

研究论文 上一篇    下一篇

纳米微晶TiO2合成Li4Ti5O12及其嵌锂行为

苏岳锋;吴锋;陈朝峰   

  1. 北京理工大学化工与环境学院,北京 100081;国家高技术绿色材料发展中心,北京 100081
  • 收稿日期:2003-11-17 修回日期:2004-02-26 发布日期:2004-07-15
  • 通讯作者: 吴锋 E-mail:wufeng863@vip.sina.com

Preparation of Li4Ti5O12 from Nanocrystalline TiO2 and It’s Lithiation Performance

Su Yue-Feng;Wu Feng;Chen Chao-Feng   

  1. School of Chemical Engineering & Environment, Beijing Institute of Technology, Beijing 100081; Laboratory of National Development Center of Hi-Technology Green Materials, Beijing 100081
  • Received:2003-11-17 Revised:2004-02-26 Published:2004-07-15
  • Contact: Wu Feng E-mail:wufeng863@vip.sina.com

摘要: 用溶胶-凝胶法并经热处理制备不同形态和晶体尺寸的TiO2,分别与Li2CO3高温固相反应生成锂钛复合氧化物,经电化学测试发现,用300 ℃热处理所得纳米微晶TiO2制备的Li4Ti5O12具有良好的嵌锂性能,其可逆比容量大于95 mA•h•g-1,充放电效率近100%,循环性能良好,电压平台平稳,在嵌锂至容量≥85%或脱锂至容量≥90%时均有明显的电压变化,可用作锂离子电池负极材料.

关键词: 纳米微晶TiO2, 热处理, Li4Ti5O12, 嵌锂性能

Abstract: Three lithium titanium composite oxides were prepared from different TiO2, and the electrochemical performance of the composite oxides was tested. The results proved that, Li4Ti5O12 prepared from nanocrystalline titanium dioxide showed a good lithiation performance. The reversible capacity of the material was more than 95 mA•h•g-1, the charge-discharge efficiency was almost 100% and the cyclic performance was good. When the lithium intercalation≥85% or the lithium extraction≥90%, its charge potential or discharge potential would change quickly. This Li4Ti5O12 is good candidate material of negative electrode for lithium-ion battery.

Key words: Nanocrystalline TiO2, Heat-treating, Li4Ti5O12, Lithiation inserting performance