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摘要本毕业论文以二水合钼酸钠作为钼源，以硫脲作为硫源，分别采用水、水-乙醇和水-乙二醇为反应体系，制备出了一系列的不同形貌的二硫化钼。通过与一元二硫化钼同样的实验条件，引入不同质量分数的氧化石墨制备出了二硫化钼/还原氧化石墨烯。通过X射线衍射，透射电镜，拉曼光谱，充放电测试、倍率充发电测试等测试手段从材料的结合方式、形貌、锂离子电池性能方面对二硫化钼进行了深入的研究。28496
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结果发现，一元二硫化钼为片层状，二元材料是以石墨烯为基底生长的颗粒状二硫化钼，仍为片层结构。一元二硫化钼的循环性能为400-600 mAh g-1，而二元的复合材料均达到1000 mAh g-1同时具有好的循环性能和倍率性能。
关键词: 石墨烯 二硫化钼 锂电池负极材料 水热法
毕业设计说明书外文摘要
Title Controlled synthesis and Lithium Storage Performance of molybdenum disulfide - graphene nanocomposites
Abstract
In this paper, molybdenum disulfide and with differing morphologies are successfully prepared by using sodium molybdate dihydrate as a molybdenum source, thiourea as a sulfur source, water, water - ethanol and water - ethylene glycol as reaction system, respectively . In addition, molybdenum disulfide / reducing graphene oxide are obtained via the same experiment with a single molybdenum disulfide. The XRD, TEM, Raman, charge and discharge test, cyclic voltammetry and AC impedance measurements are employed to confirm composition, morphology, microstructure, lithium-ion batteries performs of as-obtained molybdenum disulfide and molybdenum disulfide / reducing graphene oxide.
The experimental results indicated that graphene sheets are exfoliated and decorated with molybdenum disulfide nanoflakes.. The as-obtained molybdenum disulfide with different system as anode material for LIBs give 400-600 mA•h-1 specific reversible capacity. However, it should be pointed out that the combination of molybdenum disulfide and graphene results in a dramatic enhancement: molybdenum disulfide / reducing graphene oxide shows high specific reversible capacity up to 1000 mAh g-1 with good cycling stability and rate capability
Keywords Graphene molybdenum disulfide lithium battery cathode material hydrothermal
目 次
1 绪论 1
1.1 背景问题介绍 1
1.2锂电应用及优势 2
1.3 石墨烯——新材料的出现 3
1.4 二硫化钼----电化学领域的新应用 5
1.5 本章小结 7
2实验制备与实验基本内容 8
2.1 引言 8
2.2实验仪器 8
2.3石墨烯和氧化石墨烯 9
2. 3.1 氧化石墨烯制备 9
2.4二硫化钼的制备 9
2.4.1单一二硫化钼的制备 9
2.4.2二硫化钼石墨烯复合材料的制备 10
2.5 本章总结 12
3 测试表征 13
3.1 X射线衍射谱 13
3.2 TEM 透射电子显微镜 15
3.3 Raman 拉曼光谱 16
3.3.1 一元MoS2的Raman 拉曼光谱 17
3.3.2 复合材料MoS2/rGO的Raman 拉曼光谱 18
3.4 本章小结 21
4 电池的装配与性能测试 22
4.1电池装配 22
4.2电池的循环性能测试 22
4.3电池的倍率性能测试 26