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锂离子电池SnO2/石墨烯复合负极材料的制备及其电化学性能
Preparation and Electrochemical Performance of SnO2/Graphene Composite Anode Material for Lithium Ion Batteries
【Author】 Hongdong LIU,Jiamu HUANG,Xinlu LI,Jia LIU,Yuxin ZHANG School of Materials Science and Engineering,Chongqing University,Chongqing,China,400045
【机构】 重庆大学材料科学与工程学院；
【摘要】 以天然鳞片石墨为原料,通过氧化—热剥离—超声分散等制备氧化石墨烯,利用溶胶凝胶法制备SnO2/石墨烯复合材料。100mA/g恒电流充放电表明,首次充电容量为1026mAh/g,放电容量1463mAh/g,经过30次循环之后,SnO2/石墨烯复合材料可逆容量仍然有509mAh/g,库伦效率接近100%,克服了常见锡氧化物循环性能差的缺点,有望成为锂离子电池新一代的负极材料。
【Abstract】 Graphene oxide was obtained through three steps:the oxidation of natural graphite—thermal expansion—ultrasonication,SnO2/graphene composite was prepared by using the Sol-Gel processing. The elec-trochemical reactivities of the SnO2/graphene composite as anode material were measured by cyclicvoltammetry and galvanostatic charge/discharge cycling at 100mA/g. The results show that SnO2/graphene composite exhibited a lithium insertion capacity of 1463mAh/g and a reversible charging capacity of 1026 mAh/g. After 30 cycles,it was found that the reversible capacity was still maintained at 509mAh/g with coulombic efficiency of closely 100%. The bad cycle performance of the general tin oxides was overcome by using the SnO2/graphene composite,indicating that it’s a promising anode material for high performance lithium ion batteries.
【Key words】 SnO2/graphene； lithium ion batteries； electrochemical； composite material；
- 【会议录名称】 2011中国功能材料科技与产业高层论坛论文集（第二卷）
- 【会议名称】加速功能材料自主创新，促进西部战略性新兴产业发展——2011中国功能材料科技与产业高层论坛
- 【会议时间】2011-11-16
- 【会议地点】中国重庆
- 【分类号】TM912
- 【主办单位】中国仪器仪表学会仪表功能材料学会、重庆市科学技术协会、重庆市科学技术研究院、重庆大学、重庆材料研究院（重庆仪表材料研究所）、中国人民解放军后勤工程学院、重庆功能材料期刊社、国家仪表功能材料工程技术研究中心