球形“花”状结构MoS<sub>2</sub>/石墨烯锂离子电池负极材料及其电化学行为

牟砚圃; 王丛; 詹亮; 刘想; 王艳莉

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

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

基金项目: 国家自然科学基金（51472086，51002051）；上海市自然科学基金（12ZR1407200）.

详细信息

作者简介:
牟砚圃,硕士研究生.E-mail:muyanpu@gmail.com

通讯作者:
詹亮,教授,博士生导师.E-mail:zhanliang@ecust.edu.cn

中图分类号: TQ174
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- 被引次数: 0
出版历程
- 收稿日期: 2016-10-01
- 录用日期: 2016-12-26
- 修回日期: 2016-12-03
- 刊出日期: 2016-12-28

Synthesis and electrochemical performance of a spherical flower-like MoS₂/graphene anode material for lithium ion batteries

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, China

Funds: National Natural Science Foundation of China(51472086,51002051);Natural Science Foundation of Shanghai City(12ZR1407200).

摘要

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MoS₂/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MoS₂分散于石墨烯表面；MoS₂/石墨烯负极材料，在100 mA/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 mAh/g，1 000 mA/g）。该结果应归因于：合成的MoS₂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MoS₂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MoS₂的充放电速度。
- 二硫化钼 /
- 石墨烯 /
- 负极材料 /
- 锂离子电池
Abstract: A MoS₂/graphene composite was synthesized at 240℃ by a hydrothermal method using graphene oxide, Na₂MoO₄ 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 mAh/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.
- MoS₂ /
- Graphene /
- Anode material /
- Lithium-ion battery

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