类石墨烯MoS_2/石墨烯@无定形碳复合纳米材料的制备和电化学贮锂性能  

Preparation and electrochemical lithium storage of graphene-like MoS_2/graphene@amorphous carbon composites

作　　者：马琳[1,2] 黄国创[1] 陈卫祥[1] 王臻[1] 

机构地区：[1]浙江大学化学系,杭州310027 [2]岭南师范学院化学化工学院,广东湛江524048

出　　处：《中国科技论文》2015年第6期652-658,共7页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20110101130003);国家自然科学基金资助项目(21173190);科技部国际合作专项基金资助项目(2012DFG42100)

摘　　要：通过葡萄糖协助的水热途径制备了类石墨烯结构的MoS2/石墨烯@无定形碳复合纳米材料(GL-MoS2/G@a-C),讨论了葡萄糖的质量对复合材料的微观结构和电化学贮锂性能的影响。结果表明:葡萄糖水热碳化产生的碳质材料抑制了热处理过程中MoS2在(002)面的层状堆积,导致热处理后复合材料中单层或少层数类石墨烯MoS2的形成。电化学测试结果显示,与单纯MoS2相比,GL-MoS2/G@a-C复合纳米材料具有更好的电化学贮锂性能。当MoS2与石墨烯物质的量的比为1∶2、葡萄糖质量为0.6g时,所制备的GL-MoS2/G@a-C复合纳米材料的电化学贮锂可逆比容量达到1 135mAh/g,并具有优异的循环性能和显著增强的高倍率充放电特性。Graphene-like MoS2/graphene@amorphous carbon（GL-MoS2/G@a-C）nanocomposites were synthesized by glucoseassisted hydrothermal route.The effects of the glucose on the microstructures and electrochemical lithium storage of the composites were investigated.It is demonstrated that the carbonaceous materials produced by hydrothermal carbonization of glucose greatly restrain the stacking of MoS2in（002）plane,resulting in the formation of graphene-like MoS2 sheets with single-or fewlayers in the composites after heat treatment.Electrochemical measurement shows that the GL-MoS2/G@a-C exhibits much better reversible lithium storage than that of the pristine MoS2.Especially,the GL-MoS2/G@a-C composite prepared from MoS2 and graphene with weight ratio of 1：2following the addition of 0.6g glucose,not only delivers a high reversible specific capacity of 1 135mAh/g,but also exhibits excellent cycling stability and significantly enhanced high-rate capability.

关 键 词：电化学 二硫化钼 石墨烯 复合材料 水热合成 电化学贮锂 

分 类 号：O646[理学—物理化学] TB383.1[理学—化学]