纳米Li_4Ti_5O_(12)的合成及其电化学性能  

Synthesis of nano-sized Li_4Ti_5O_(12) and its electrochemical performance

作　　者：李雅楠[1] 王瑾[1] 颉莹莹[1] 杨晖[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《电源技术》2011年第12期1500-1503,共4页Chinese Journal of Power Sources

基　　金：国家重点基础研究计划"973"项目(2007CB-2097050);国家自然科学基金(20803035);江苏省自然科学基金(BK200718)

摘　　要：采用溶胶-凝胶法合成了Li4Ti5O12纳米材料,研究了不同Li/Ti摩尔比、煅烧温度以及保温时间对材料结构及性能的影响。采用XRD、SEM以及恒流充放电测试对材料的结晶度、表面形貌以及电化学性能进行了表征。研究表明,锂钛摩尔比为1 800℃下保温10 h后制备的产物具有单一的尖晶石结构,颗粒大小均一且电化学性能优良。在0.1 C下首次放电比容量达到165 mAh/g,经过50个循环后放电容量仍大于125 mAh/g。Nano-sized Li4Ti5O12 powders with spinal structure were prepared via a sol-gel method in this paper. The influence of c（Li）/c（Ti）（mole ratio）, heating temperature and heating time on the properties of the synthesized sample were systematically investigated. The crystal structure, microstructure and the electrochemical performance of the prepared samples were characterized by XRD, FESEM and galvanostatically charge-discharge experiments. The results show that the Li4Ti5O12 powders synthesized under the optimum conditions （cLi ： cTi=1 ： 1, calcined at 800 for 10 h） show a perfect spinel structure with a uniform particle size distribution; Meanwhile, it exhibits an excellent electrochemical performance which delivers 165 mAh/g at a cycle rate of 0,1 C and retains more than 125 mAh/g after 50 cycles.

关 键 词：锂离子电池 LI4TI5O12 溶胶-凝胶 纳米材料 

分 类 号：TB912.9[一般工业技术—计量学]