TiO_2包覆的尖晶石LiMn_2O_4的电化学性能  

Electrochemical performance of spinel LiMn_2O_4 coated with TiO_2

作　　者：冯传启[1] 李华[1] 王世银[1] 李丽[1] 

机构地区：[1]湖北大学化学与化工学院,湖北武汉430062

出　　处：《电池》2009年第5期257-259,共3页Battery Bimonthly

摘　　要：用超声波振荡法，将粒径约为20nm、用溶胶-凝胶法合戍的TiO2颗粒包覆在流变相法合成的LiMn2O4表面，再在600℃下处理2h，得到TiO2包覆的尖晶石LiMn2O4。在3．0～4．4V，产物以1．0C充放电的首次放电比容量为121．7mAh／g．第100次循环的放电比容量为108．3mAh／g；以0．5C充放电的首次放电比容量为126．7mAh/g，第200次循环的容量保持率为86．0％。TiO2 with particle size about 20 nm prepared by sol-gel method was coated on the surface of LiMn2O4 prepared by rheological phase reaction method via ultrasonic wave oscillation method, then treated at 600 ℃ for 2 h to obtain the spinel LiMn2O4 coated w, ith TiO2. At 3.0 - 4.4 V, the initial specific discharge capacity of the product charge-discharge at 1.0 C was 121.7 mAh/g, the specific discharge capacity at the 100th cycle was 108.3 mAh/g, the initial specific discharge capacity charge-discharge at 0.5 C was 126.7 mAh/g,the capacity retention at the 200th cycle was 86.0%.

关 键 词：锂离子电池 尖晶石 二氧化钛(TiO2) 流变相反应 

分 类 号：TM912.9[电气工程—电力电子与电力传动]