锂离子电池富锂Fe-Mn基复合材料微纳米结构调控及电化学性能研究

项目名称： 锂离子电池富锂Fe-Mn基复合材料微纳米结构调控及电化学性能研究

项目编号： No.21301013

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： 赵煜娟

作者单位： 北京工业大学

项目金额： 25万元

中文摘要： 锂离子电池作为二十一世纪新型绿色环保电池，以其高电压、高能量密度等性能得到了迅猛发展。作为锂离子电池的正极材料，富锂Fe-Mn基正极材料(1-x)Li2MnO3oxLiFeO2不仅具有高比容量，高能量密度等特点，同时还具备铁基正极材料价格低廉、储量丰富，环境友好等优点。针对高性能富锂Fe-Mn基材料合成困难、结构稳定性及倍率性能较差的特点，本课题设计合成纳米-微米复合结构富锂Fe-Mn基正极材料，探索简单新型的合成及结构调控方法，在调控粒径的同时建立高导电性碳网络，改善材料的界面稳定性及导电性，提高快速脱嵌Li+及电子能力；并结合金属离子掺杂，提高晶体结构稳定性；并进一步通过深入结构表征手段及电化学技术研究分析充放电过程中材料结构变化与电化学性能的关系。对富锂Fe-Mn基正极材料的在高能量密度的动力锂离子电池中实际应用具有重要意义

中文关键词： 锂离子电池；富锂Fe-Mn基正极材料；微纳结构；导电碳网络；电化学性能

英文摘要： Today's Lithium ion batteries are used widely because of their high voltage and energy density. As positive electrode materials, the Li-rich Fe-Mn based cathode materials possess the advantages of high capacity and energy density, meanwhile have the characters of Fe-based cathode materials, such as low cost, abundant reserves and environment-friendly. According to the characteristics of the Li-rich Fe-Mn based materials of synthetic difficulties, poor structure stability and rate capability, the Li-rich Fe-Mn based cathode materials with micro-nano composite structure are designed in this project. In order to improve the rate capability, the simple and feasible synthesis method and morphology control technology are explored to control the particle size and set high conductive carbon network at the same time. Moreover, the cycle stability of structure will be improved via combined with the doping metal ions. Further the relationship between the change of material structure and electrochemical properties in cycling process will be studied via electrochemical and structure characterization technology. It is important to the Li-rich Fe-Mn based cathode materials for actual application in high energy density power lithium ion battery.

英文关键词： lithium ion batteries；Li-rich Fe-Mn based cathode materials；micro/nano structure；carbon conductive network；electrochemical performance