球形“花”状结构MoS2/石墨烯锂离子电池负极材料及其电化学行为  

Synthesis and electrochemical performance of a spherical flower-like MoS_2/graphene anode material for lithium ion batteries

作　　者：牟砚圃 王丛[1] 詹亮[1] 刘想[1] 王艳莉[1] MOU Yan-pu WANG Cong ZHAN Liang LIU Xiang Wang Yan-li(State Key Laboratory of Chemical Engineering, Key Laboratory for Specially Functional Polymers and Related Technology of Ministry of Education, East China University of Science and Technology, Shanghai 200237 , Chin)

机构地区：[1]华东理工大学,化学工程联合国家重点实验室,特殊功能高分子材料及其相关技术教育部重点实验室,上海200237

出　　处：《新型炭材料》2016年第6期609-614,共6页New Carbon Materials

基　　金：国家自然科学基金(51472086,51002051);上海市自然科学基金(12ZR1407200)

摘　　要：以氧化石墨烯、钼酸钠、硫脲为原料,采用水热法在240℃原位合成MoS_2/石墨烯纳米复合材料,并考察了其作为锂离子电池负极材料的电化学性能。结果表明:由片层纳米结构自组装形成球形"花"状结构的MoS_2分散于石墨烯表面;MoS_2/石墨烯负极材料,在100 m A/g电流密度下100次循环后,放电容量仍达735.2 mAh/g,并具有良好的大电流倍率性能(375 m Ah/g,1 000 mA/g)。该结果应归因于:合成的MoS_2为较薄的片层结构,减小了离子、电子的扩散或迁移路径;片层结构的MoS_2自组装成球形"花"状,构筑了丰富的中孔,有利于离子的扩散和存储,也能抑制材料在充放电过程中的体积膨胀;石墨烯良好的导电性及高比表面积,能有效提高MoS_2的充放电速度。A MoS2/ graphene composite was synthesized at 240 ℃ by a hydrothermal method using graphene oxide,Na2 MoO4 and CS（ NH2）2 as the raw materials. Results indicate that the spherical flower-like MoS2 structure was self-assembled by thin MoS2 micrometer size layers and dispersed uniformly on the surface of graphene. The MoS2/ graphene composite as an anode material retains a capacity of 735. 2 mAh / g after 100 cycles under a current density of 100 mA / g and has a good rate performance（ 490. 3 mAh/g at 400 mA /g and 411. 9 m Ah/g at 800 mA /g）. The excellent electrochemical performance of the composite is attributed to its special structure. The thin MoS2 layers shorten the diffusion and transport paths for Li^＋ions and electrons. The abundant mesopores are beneficial for ion diffusion and act as a buffer to inhibit volume changes during charge-discharge. Graphene increases the charge-discharge rate of MoS2 effectively owing to its high conductivity and high surface area.

关 键 词：二硫化钼 石墨烯 负极材料 锂离子电池 

分 类 号：TB332[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]