过度金属掺杂磷酸锰锂正极材料的结构与性能研究

项目名称： 过度金属掺杂磷酸锰锂正极材料的结构与性能研究

项目编号： No.U1232104

项目类型： 联合基金项目

立项/批准年度： 2013

项目学科： 物理学II

项目作者： 郭培志

作者单位： 青岛大学

项目金额： 66万元

中文摘要： 由于能量密度高和充放电性能优良等特点，锂离子电池在手机、笔记本电脑和电动汽车等许多领域得到广泛研究与应用。高安全性、高蓄电量的大尺寸锂离子电池是当前锂离子电池的一个重要发展方向，高性能电极材料研究已成为锂离子电池关键技术研究中的热点。本课题拟通过静电纺丝－热处理相结合的方法，研究过渡金属掺杂磷酸锰锂纳米纤维正极材料的制备。基于表面导电碳层包覆研究和纳米纤维材料的物理化学表征，特别是通过同步辐射X-射线衍射（XRD）和X射线吸收精细结构谱（XAFS）等测量，研究过渡金属掺杂磷酸锰锂纳米纤维在锂离子电池，特别是绿色（水）体系锂离子电池电化学反应过程中的结构变化，并结合理论计算与模拟，揭示材料的尺寸、结构同其电化学性能之间的关系。

中文关键词： 磷酸锰锂；电化学；静电纺丝；原位表征；锂离子电池

英文摘要： Lithium ion batteries (LIBs) have been widely used in many fields, such as mobile phone, laptop and electric vehicles due to their numerous merits such as high energy density and excellent charge-discharge performances. Fabrication of large-scale LIBs with high security and high volumeric energy density becomes an important research direction. Electrode materials with high performances have been attracted much attention in the developments of LIBs. This project aims to synthesize transition metal doped lithium manganese phosphate (DLMP) nanofibers as cathode materials of LIBs based on the combination of electro-spinning and heat treatment. Based on their carbon coating and physiochemical characterization, especially the in-situ study by synchrotron X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS), the structure variation of DLMP-based nanobiber cathode materials will be studied during the electrochemical reactions in LIBs, especially in green (aqueous) LIBs. The relationship between the size, structure and electrochemical performances of DLMP-based nanofiber materials should be clarified by the experimental study combined with theoretical simulation and calculation.

英文关键词： Lithium manganese phosphate；Electrochemistry；Electrospinning；In-situ characterization；Lithium-ion battery