锰氧化物/石墨烯复合材料作为锂离子电池负极的研究  

A study on MnO_x/graphene composites as anode materials for lithium ion batteries

作　　者：高云雷[1] 赵东林[1] 沈曾民[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《功能材料》2012年第11期1446-1449,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50672004)

摘　　要：以天然石墨为原料,采用改进的Hummers法合成含Mn的氧化石墨;400℃条件下氢气还原制备了锰氧化物/石墨烯复合材料。利用XRD、SEM和TEM对所制备的复合材料进行了表征。结果表明锰氧化物(MnOx)颗粒均匀地分布在石墨烯片层表面。将复合材料作为锂离子电池负极进行研究,在50mA/g电流密度下,首次库伦效率为70.4%,可逆容量达876mAh/g,并且具有良好的循环性能,在30次循环后仍保持在700mAh/g以上。The precursor of Mn hybrid material was synthesized by a modified Hummers method and MnOx/graphene composites were obtained through a reduction in nitrogen and hydrogen atmosphere at 400℃.The composite material was investigated as anode materials for lithium ion batteries via scanning and transmission electron microscopy（TEM）,X-ray diffraction（XRD） and a variety of electrochemical testing techniques.Experimental results showed that nano-particles of manganese oxide were well dispersed on the surface of graphene sheets.The first reversible capacity of the prepared composite was as high as 876mAh/g at current density of 50mA/g.After 30 cycles,the reversible specific capacity was still maintain at more than 700mAh/g.

关 键 词：锂离子电池 锰氧化物 石墨烯 电化学性能 循环伏安 

分 类 号：TM912.9[电气工程—电力电子与电力传动]