二硫化钼石墨烯复合材料的合成及电化学性能研究毕业论文.docx

南开大学本科生毕业论文（设计）中文题目：二硫化钼/石墨烯复合材料的合成及电化学性能研究外文题目：Synthesis of MoS2/rGO composites and electrochemical performancesinvestigation学号：姓名：　　　　年级：　　级　　专业：　　材料化学　　系 别：　　材料化学　　学院：　　化学学院　　指导教师：　　　　完成日期：　　　　摘　　要MoS2作为一种典型的过渡金属硫化物，具有类石墨烯层状结构，当作为电极材料应用于锂离子电池时，表现出优异的储锂能力，但是其较差的导电性造成其循环稳定性较差。为解决这一问题，本论文结合还原氧化石墨烯（rGO）优良的导电性，采用溶剂热法原位合成MoS2/rGO复合材料。通过XRD、SEM、TEM和XPS等手段，对材料的形貌和结构进行表征。通过TEM图可以看出，MoS2纳米片成功均一负载到rGO表面上。通过HRTEM照片可以看出所制备的复合材料具有明显的层状结构。当复合材料用作锂离子电池负极时，由于rGO的加入，材料的循环性能和倍率性能有了明显的改善和提高。当rGO含量为10%时，MoS2/rGO复合材料展现出最为优异的电化学性能，首次放电比容量大约为1300mAh/g，循环30周以后仍保持在920mAh/g。同时，复合材料也展现出优异的倍率性能。关键词：二硫化钼；还原氧化石墨烯；锂离子电池；复合材料AbstractAs a typical type of transition metal chalcogenides, MoS2has layered structure like graphene. When it applies as the anode material of lithium-ion battery, it has excellent capability of lithium storage, but the cycling stability and conductivity are not satisfied. To solve this problem and combining with the good conductivity of graphene, MoS2/graphene was in situ synthesized by hydrothermal method. The morphology and composition were characterized by XRD, SEM, TEM(HRTEM), Raman and so on. Through the analysis, it is obvious that MoS2is supported on the surface of graphene and disperses evenly.And HRTEM proved that as-synthesized composite has layered structure and the interlayer spacings are enlarged because of the intercalation of graphene. When the composite is used as the anode material for lithium-ion batteries, the cyclic performance and rate performance are enhanced for the added of graphene. When the proportion of rGO in the composite is 10%, the reversible capacity of MoS2/graphene composite is about 1300mAh/g in initial cycle and remain 920mAh/g after 30 cycles at the current of 100mA/g, and it exhibits superior cyclic performance than others. So it is demonstrated that the content of graphene will influence the performance of composite, but not means the more the better.Keywords: molybdenum disulfide; reduced graphene oxide;lithium-ion battery;composit