尖晶石型Li_4Ti_5O_(12)的合成及其性能  

Synthesis and Electrochemical Properties of Spinel Li_4Ti_5O_(12)

作　　者：麦发任[1] 吴显明[1,2] 赵俊海[1] 刘金练[1] 曾姝[1] 

机构地区：[1]吉首大学化学化工学院,湖南吉首416000 [2]湘西自治州矿产与新材料技术创新服务中心,湖南吉首416000

出　　处：《吉首大学学报（自然科学版）》2012年第5期98-101,共4页Journal of Jishou University(Natural Sciences Edition)

摘　　要：采用高温固相法、溶胶-凝胶法和热聚合法制备锂离子电池负极材料Li4Ti5O12.通过X-射线衍射、扫描电镜显微镜、电化学阻抗和恒流充放电表征产物的结构、形貌及电化学性能.3种方法制备的Li4Ti5O12均为尖晶石结构,用高温固相法所得的粉体颗粒较大,而用溶胶-凝胶法所得粉体颗粒最小,其平均粒度在200～350nm范围内,表现出较好的电化学性能;溶胶-凝胶法制备的样品粉末在0.2C倍率下首次放电容量为174.5mAh/g,经过25次循环后容量衰减仅5.7%.The anode materialLi4Ti5O12 for Li-ion battery was synthesized by high temperature solid-state method, sol-gel method and thermal polymerization method. Its structural characterization, surface morphology and electrochemical performance of products were characterized by X-ray diffractometry, scanning electron microscopy, electrochemical impedance spectroscopy, and galvanostatic charge-discharge test. The result shows that Li4Ti5O12 prepared by the three methods.had perfect spinel structure. The powders prepared by high temperature solid-state were the biggest, while the powders prepared by sol-gel were the smallest with an average dimension of 200-350 nm and exhibited better electrochemical performance. Its initial specific discharge capacity was 174.5 mAh/g at 0.2 C rate,only reducing 5.7% after 25 cycles.

关 键 词：锂离子电池 负极材料 LI4TI5O12 高温固相 溶胶-凝胶 热聚合 

分 类 号：TM912[电气工程—电力电子与电力传动]