钼基纳米多孔材料的可控构筑及储锂机制研究

项目名称： 钼基纳米多孔材料的可控构筑及储锂机制研究

项目编号： No.21301117

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： 吴雪艳

作者单位： 上海交通大学

项目金额： 25万元

中文摘要： 电极材料作为锂离子电池的重要组成部分，是提高锂离子电池性能的关键，也是制约锂离子电池发展的瓶颈。本项目拟以比容量高的钼基电极材料为研究对象，利用多孔结构有利于电极内部被电解液浸润，可以加快材料内部的传质过程这一特点，开发新的制备路线，设计合成出结构、形貌和晶相可控的新型钼基多孔电极材料。优化制备和后处理条件，控制多孔骨架材料的晶相、结晶度和碳含量；再对材料进行表面包覆等复合改性，改善锂离子的迁移率和导电性，从而进一步提高其电化学性能；以原位X-射线衍射和吸收等在线检测手段研究锂离子电池充放电过程，阐释钼基电极材料的储锂机理，为开发容量大、倍率特性好、循环稳定性高和成本低的锂离子电池电极材料进行积极探索。

中文关键词： 锂离子电池；钼基电极材料；多孔结构；储锂性能；可控制备

英文摘要： As a key component in rechargeable lithium ion batteries, electrode materials play an important role in determining the electrochemical performance of the batteries. It is of particular importance to develop low-cost, high performance electrode materials. This project will focus on the design and fabrication of new porous molybdenum-based anode materials. New preparation strategies will be developed to manipulate the porous structures, dimension and crystallinity of these molybdenum-based materials. The phase, crystallinity and carbon content of the porous molybdenum-based materials will be well controlled through careful selection of the synthesis and post-treatment processes. The porous structure introduced will facilitate the penetration of the electrolyte with the electrode and shorten the diffusion distance of lithium ions and electrons. The surface coating is expected to enhance the lithium ion and electron conductivities of the molybdenum-based materials. Consequently, the rate capability and cycling stability of these materials will be improved. In situ characterization techniques, such as in situ X-ray diffraction and adsorption, will be employed to investigate the processes of lithium ion intercalation/de-intercalation to elucidate the energy storage mechanism for molybdenum-based materials and disclos

英文关键词： lithium ion batteries；Mo-based electrode material；porous structure；lithium storage properties；controlled preparation