Cr2O3修饰Li4Ti5O12的制备及电化学性能  

Preparation and electrochemical performance of Cr_2O_3 modified Li_4Ti_5O_(12)

作　　者：王俊生[1] 曹杰[1] 赵飞[1] 王保峰[1] 

机构地区：[1]上海市电力材料防护与新材料重点实验室,环境与化学工程学院,上海电力学院,上海200090

出　　处：《电池》2015年第3期135-138,共4页Battery Bimonthly

基　　金：上海市科学技术委员会重点实验室建设资金(14DZ2261000)

摘　　要：采用湿法球磨工艺和热处理制备三氧化二铬（Cr2O3）修饰钛酸锂（Li4Ti5O12）材料。Cr2O3修饰后,Li4Ti5O12的XRD图中没有出现杂质峰。Cr2O3修饰可提高Li4Ti5O12在高倍率下的容量保持率和循环性能。Li4Ti5O12-1.5%Cr2O3材料的倍率性能和循环性能最好,以5.0 C在1.0-2.5 V充放电,第500次循环的放电比容量为122.8 mAh/g,容量保持率为96.2%;纯相Li4Ti5O12分别为48.3 mAh/g、81.1%。Cr2O3修饰降低了Li4Ti5O12的电荷转移阻抗,提高了材料的电化学活性。Chromium oxide （Cr2O3 ）modified lithium titanate （Li4Ti5O12）was obtained by wet ball milling process and heat treatment. After Cr2O3 modification, no impurity peaks were found in the XRD patterns of Li4Ti5O12. The capacity retention rate and cycle performance of Li4Ti5O12 at high rate were improved after Cr2O3 modification. The Li4Ti5O12-1.5% Cr2O3 material had the best rate capability and cycle performance. When charged-discharged with 5.0 C in 1.0 - 2. 5 V, its specific discharge capacity was 122. 8 mAh/g at the 500th cycle, the capacity retention was 96. 2%, while the pure Li4Ti5O12 was 48. 3 mAh/g and 81.1%, respectively. The charge transfer resistance of Li4Ti5O12 was reduced after Cr203 modification,the electrochemical activity of the material was improved.

关 键 词：钛酸锂(Li4Ti5O12) 负极材料 电化学性能 三氧化二铬(Cr2O3) 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]