Co_3O_4修饰Li_4Ti_5O_(12)的制备及电化学性能研究  

Preparation and electrochemical properties of Co_3O_4 modified Li_4Ti_5O_(12) anode material for Li-ion battery

作　　者：王俊生[1] 王保峰[1] 曹杰[1] 曾涛[1] 刘宇[1] 

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

出　　处：《电源技术》2015年第11期2362-2364,2370,共4页Chinese Journal of Power Sources

基　　金：上海市科学技术委员会重点实验室建设资金(14DZ-2261000);上海市教委"085"工程项目

摘　　要：通过简单的湿法球磨混合工艺,经过低温热处理得到Co3O4修饰Li4Ti5O12复合材料。通过X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)、能量散射光谱(EDS)、恒电流充放电测试、循环伏安(CV)以及交流阻抗(EIS)对材料的结构、形貌、组成及电化学性能进行表征。结果表明,Co3O4修饰没有改变Li4Ti5O12的尖晶石结构,以小颗粒的形式分布在材料中。Co3O4修饰增强了材料的电化学活性,减小了电极极化,使得材料的电化学性能得到提高。其中1%(质量分数)的Co3O4修饰Li4Ti5O12显示出较好的倍率性能和循环稳定性,0.2 C下的首次放电比容量为174 m Ah/g,2 C下循环300次后比容量为128.2 m Ah/g,容量保持率为95.6%。Li4Ti5O12/Co3O4 composites were successfully synthesized by wet ball-milling and following calcination. The crystalline structure, morphology, ingredient and electrochemical properties of the obtained materials were char- acterized by XRD, SEM, EDS, galvanostatic tests, cyclic voltammetry （CV） and AC impedance. The results show that modification with Co3O4 does not change the basic structure of Li4Ti5O12 and Co3O4 is dispersed on the surface of Li4Ti5O12. Electrochemical measurements demonstrated that the Co3O4 modified Li4Ti5O12 anode material shows obviously improved high rate performance and superior cycling stability. 1% Co3O4 modified Li4Ti5O12 displays high initial discharge capacity of 174 mAh/g at 0.2 C and maintains 95.6% of its initial capacity after 300 cycles at 2 C, which shows the best among all samples.

关 键 词：锂离子电池 负极材料 LI4TI5O12 CO3O4 

分 类 号：TM912.9[电气工程—电力电子与电力传动]