二硫化钼/石墨烯复合电极的制备及其储锂性能  

Li-Storage Performance of MoS_2/Graphene Composite Synthesized by Chemical Vapor Deposition Method

作　　者：陈俊杰[1] 胡雪波[1] 张琴[1] 卢文静[1] 付磊[1] 艾新平[1] 

机构地区：[1]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2016年第1期19-24,共6页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金(51322209;21473124);教育部博士点基金(20120141110030)资助项目

摘　　要：通过在载有四硫代钼酸铵的石墨烯泡沫(GF)基底上化学气相沉积(CVD)石墨烯,直接制备出具有包埋结构的MoS_2/GF复合材料.SEM和TEM的结构分析结果表明,粒径约50nm的MoS_2被紧密包埋在三维多孔石墨烯泡沫集流体上,可直接作为锂离子电池的储锂阳极.Raman光谱证实,CVD法制备的石墨烯具有高的品质,可以为MoS_2/GF复合材料提供良好的电子导电网络.充放电测试结果表明,MoS_2/GF复合阳极具有高的储锂容量、良好的循环性.其初始容量为1 016mAh/g;循环50周后,比容量仍保持在800mAh/g以上.复合阳极优异的储锂性能主要来自于两方面:一方面,GF基体的三维孔结构可有效增加电极的反应界面,保证了MoS_2的高电化学利用率;另一方面,GF的包埋有效缓解了MoS_2的体积效应,保证了活性物质的电化学稳定性.A novel MoS2/GF composite with an embedding structure was prepared directly by chemical vapor dep- osition （CVD） of graphene layer on the （NH4）2 MoS2-loaded graphene foam （GF） substrate. The structure character- izations from SEM and TEM revealed that MoS2 naoparticles with a particle size of ～50 nm were tightly embedded in and integrated with the 3D porous graphene foams, which could be directly used as high capacity Li-storage anode for lithium-ion batteries without requiring binder, conducting agent and current collector. Raman spectra demonstrated that the graphene layer deposited on MoS2 naoparticles by chemical vapor deposition （CVD） method has high quality without any defects, which could provide excellent electrical conductivity for the embedded MoS2 nanoparticles. The charge/discharge tests showed that the as-prepared MoS2/GF composite can exhibit a high Li-storage capacity of 1 016 mAh/g and stable cycling performance with a remaining capacity of 800 mAh/g after 50 cycles. Such an excellent Li- storage performance should be arise from the unique structure of MoS2/GF composite, in which the abundant 3-D porous structure of graphene foam substrate significantly increases the electrochemical reaction sites, thus enabling a high electrochemical utilization for active MoS2 nanoparticles. Also, the embedding of graphene can accommodate the huge volumetric changes of composite anode during lithiation/delithiation processes, thus enabling a high cycling sta-bility.

关 键 词：二硫化钼 化学气相沉积 石墨烯泡沫 锂离子电池 

分 类 号：O646[理学—物理化学]