金属硫化物纳米复合负极材料的可控构筑及其性能研究

项目名称： 金属硫化物纳米复合负极材料的可控构筑及其性能研究

项目编号： No.21301124

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 邵杰

作者单位： 苏州大学

项目金额： 25万元

中文摘要： 金属硫化物由于其高比容量、自然资源丰富和价格便宜等优点而被认为是可能取代石墨负极材料的候选材料之一。然而，金属硫化物的低电子电导率、充放电过程中较大的体积形变以及放电中间产物聚硫化锂的溶解等缺点成为其应用的主要障碍。鉴于此，本项目拟开展(1)以高比表面积的金属有机骨架(MOFs)作为前驱体制备结构可控的金属硫化物-多孔碳复合材料。与传统制备方法相比，该法制备的金属硫化物能以更小的颗粒更均匀地分散在多孔碳骨架中，从而可大幅度提高活性物质的利用率及循环稳定性；(2)采取模板法制备中空金属硫化物@聚吡咯双壳微球复合材料。硫化物的中空结构可以有效缩短Li+扩散路径并缓冲材料充放电过程中的体积形变，而导电的聚吡咯包覆层可以有效抑制聚硫化物的溶解。此工作的开展，不仅可提高金属硫化物负极材料的可逆容量和循环稳定性，增加其实际应用的可能性，并为制备高性能金属硫化物基负极材料提供一种新的制备方法和理论基础。

中文关键词： 锂离子电池；负极；金属硫化物；二硫化钼；

英文摘要： Metal sulfides, with the advantages of high capacity, abundant resource, and low cost, have been becoming an alternative anode material for lithium ion batteries. However, the low electronic conductivity, large volume change during charge/discharge, and high dissolution of intermediate discharge products (polysulfides) are the main obstacles restricting their application. In this proposal, we planned to carry out the following work. (1) Preparing various metal sulfides/porous carbon nanocomposites (MSx/C) using high surface area metal organic frameworks (MOFs) as precursor. In comparison with the MSx/C composites prepared through traditional method, the obtained metal sulfides particles could be much smaller and their distribution on the porous carbon framework could be more uniform. Thus this may result in improved utilization efficiency and cycling stability of MSx/C composites. (2) Preparing hollow metal sulfides@polypyrrole dual-shell microspheres through template method. The hollow structure of metal sulfides could shorten the diffusion length of Li+ and buffer the volume change of electrode materials. The conductive polypyrrole coating could prevent dissolution of polysulfides. This work can not only improve the electrochemical performance of metal sulfides-based anode materials, but also provide a new met

英文关键词： Lithium ion batteries；Anode；Metal sulfies；MoS2；