尖晶石结构Li_4Ti_5O_(12)的制备及其电化学性能  

Preparation of Spinel Li_4Ti_5O_(12) and Electrochemical Performance

作　　者：曹绍梅[1,2] 张大卫[1,2] 冯欣[1,2] 迟涛 施利毅[1,2] 

机构地区：[1]上海大学纳米科学与技术研究中心,上海200444 [2]东莞上海大学纳米科学与技术研究院,广东东莞523770 [3]中国石油上海销售公司,上海200122

出　　处：《上海大学学报（自然科学版）》2012年第6期572-576,共5页Journal of Shanghai University:Natural Science Edition

基　　金：上海市科委纳米专项基金资助项目(1052NM00200);上海市优青科研专项基金资助项目(SHU09061)

摘　　要：以TiO2和醋酸锂为原料,采用在乙醇中预分散和在液相体系中熔融浸渍的协同共混技术,实现反应物料间微尺度混合,在较低温度下分段煅烧合成纳米结构钛酸锂.X射线衍射(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)和粒度分布等测试结果表明,产物为尖晶石结构钛酸锂(Li4Ti5O12),平均粒径约为550 nm.以该产物为负极材料组装锂离子电池并测试其电化学性能,结果表明其性能良好,0.1 C倍率下首次充放电比容量高达165 mA.h/g,具有稳定的电压平台,循环性能良好.Nano-sized Li4TisOx2 was prepared at a low temperature with TiO2 and lithium acetate as starting materials. Atom-sized blending was achieved by the liquid pre-dispersion and melting-soakage with ethyl alcohol as solvent. Calcination was carried out by different steps at relative low temperatures. The X-ray diffraction （XRD）, scanning electron microscope （SEM） and size distribution tests showed that the LiaTi5012 was spinel structure with an average size of about 550 nm. The Li4TisOl2 showed good electrochemical performance with the first charge-discharge capacity achieving 165 mA h/g at 0.1 C and having a steady voltage and good cyclic performance.

关 键 词：尖晶石结构钛酸锂(Li4Ti5O12) 醋酸锂 尖晶石结构 制备 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动] TM912.9