纳米微晶TiO_2合成Li_4Ti_5O_(12)及其嵌锂行为  

Preparation of Li_4Ti_5O_(12) from Nanocrystalline TiO_2 and It's Lithiation Performance

作　　者：苏岳锋[1] 吴锋[1] 陈朝峰[1] 

机构地区：[1]北京理工大学化工与环境学院

出　　处：《物理化学学报》2004年第7期707-711,共5页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展计划(2002CB211800);国家基础研究重大项目前期研究专项(2001CCA05000);国家自然科学基金(90206043)资助项目

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.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 the charge-discharge efficiency was almost 100% and the cyclic performance was good. When the lithium intercalation greater than or equal to 85% or the lithium extraction greater than or equal to 90%, its charge potential or discharge potential would change quickly. This Li4Ti5O12 is good candidate material of negative electrode for lithium-ion battery.

关 键 词：纳米微晶TiO2 热处理 LI4TI5O12 嵌锂性能 

分 类 号：TM911.1.O646.54[电气工程—电力电子与电力传动]