功率型锂离子电池负极材料TiO_2/石墨烯的制备及其电化学性能研究  

Preparation and Electrochemical Performance of TiO_2/GNs Nanocomposite as Anode Materials for Lithium-Ion Batteries

作　　者：秦琳琳[1] 张焕[1] 刘晓静[1] 许剑辉[1] 施一宁[1] 郑明森[1] 董全峰[1] 

机构地区：[1]厦门大学固体表面物理化学国家重点实验室,化学化工学院化学系,福建厦门361005

出　　处：《电化学》2012年第3期201-204,共4页Journal of Electrochemistry

基　　金：国家自然科学基金项目(No.200933005,No.02903077);国家973项目(No.2009CB220102)资助;厦门市纯电动汽车重大科技专项(I期)(No.3502Z20121002)

摘　　要：采用无表面活性剂回流法制备了蜂窝状TiO2/石墨烯(GNs)复合材料.扫描电子显微镜(SEM)及透射电子显微镜(TEM)表征结果表明,TiO2颗粒约5～10 nm,均匀地分散在石墨烯的表面.锂电池测试显示,1C充电容量稳定在240.1 mAh.g-1;30C充电容量为169.5 mAh.g-1;当电流调回1C时,其充电容量仍可完全恢复(241.7 mAh.g-1);10C 300周期循环电极容量保持率为89.8%.The honeycomb-like porous TiOJgraphenes （TiOJGNs） nanocomposite was prepared by a reflux method. SEM and TEM results showed that nanosized anatase TiO2 （about 5 - 10 nm） were dispersed uniformly on the surface of the GNs. The TiO2/GNs composite showed excellent rate and cycling performance. A stable charge capacity of 169.5 mAh g-1 was obtained at 30C, and can restore to 241.7 mAh g-1 while current went back to 1C. The stable charge capacity of TiOJGNs nanocomposite electrode up to 201.9 mAh g-1 was achieved at 10C in the first cycle,and could be maintained at 181.4 mAh g-1 after 300 cycles.

关 键 词：锂离子电池 负极材料 TIO2 石墨烯 

分 类 号：O646[理学—物理化学] TM912.9[理学—化学]