锂离子电池新型锂钒氧负极材料及其电化学性能

项目名称： 锂离子电池新型锂钒氧负极材料及其电化学性能

项目编号： No.51302099

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 李会巧

作者单位： 华中科技大学

项目金额： 25万元

中文摘要： 过去人们对钒系电极材料的研究主要集中在钒氧二元化合物上，且主要将它们用作正极材料。本项目拟在前期工作基础上将研究范围从二元钒氧化合物拓展到锂钒氧三元化合物，研究的目标则从正极材料转到负极材料上。具体来说，以锂钒氧三元化合物的合成、表征和电化学性能评价为研究主线，以揭示锂钒氧的物理化学性质与电化学性能之间的关系为研究导向，通过调节锂、钒、氧三种元素的配比以及控制合成条件来改变锂钒氧的化学组成、晶体结构、微观形貌和物相种类来寻找具有高反应活性、大容量和低反应电位的锂钒氧三元化合物，结合多尺度、多方位的结构表征及电化学测量手段分析其电化学反应机制，并依据其物理化学性质及电化学行为特点进行性能优化，最终开发出具有优良电化学性能的新型钒基锂离子电池负极材料，同时为锂钒氧三元化合物的制备以及在锂离子电池中的应用提供指导和技术借鉴。

中文关键词： 锂钒氧；电化学反应机理；电化学性能；碳包覆；掺杂

英文摘要： Most of the previous study on vanadium-based electrode materials focuses on the binary vanadium oxides and uses them as the cathode materials. In this proposal, we extend the research scope from binary vanadium oxides to ternary Li-V-O compounds with the purpose to find new type of anode candidates rather than cathode materials for lithium ion batteries. In detail, we will synthesize, characterize, and investigate the electrochemical performances of a series of Li-V-O ternary compounds, aiming to indentify the inherent relationship between the physical chemical properties of Li-V-O compounds and their electrochemical performances. By changing the starting element ratios and preparation conditions, the chemical composition, crystal structure, detailed morphology and phase category of the Li-V-O compounds would be adjusted and systematically studied to explore host candidates of high activity, large capacity and low reaction voltage for lithium insertion/de-insertion. The selected Li-V-O candidates will be investigated in depth to learn their electrochemical reaction mechanism by combing electrochemical techniques and multiple physical chemical measurements. Further promotion of their electrochemical performances will be made by physical chemical modifications according to the behavior features. High performance v

英文关键词： lithium vanadium oxides；electrochemical mechanism；electrochemical performances；carbon coating；doping