基于LiFePO4、Li3V2(PO4)3和LiVPO4F三者的特点，本研究拟将其原位复合设计出兼具有三者优点的正极材料xLiFePO4oyLi3V2(PO4)3o(1-x-y)LiVPO4F，重点研究原位复合过程反应机理、复杂结构特点与性能之间的构效关系、结构调控规律。通过固相烧结法合成材料，以现代分析测试方法解析材料的复合过程反应机理及相结构、微结构和表面结构特征；辅助电化学分析手段，研究材料在电池使用过程中的材料表面电化学、Li+的脱/嵌机理和结构变化；通过控制合成过程（调整复合比例x:y、复合掺杂、改变温度和时间等），实现对材料的微观结构性能调控，从而优化材料性能；最后通过原位预包覆碳法，合成出具有纳米核壳结构的高倍率型复合材料。解明复合材料的反应过程机理；建立结构特点与电化学性能之间的构效关系；得出复合材料的结构性能调控规律，为锂离子电池复合材料的相关研究提供理论参考和技术原型。

A novel cathode material xLiFePO4oyLi3V2(PO4)3o(1-x-y)LiVPO4F for multipurpose use of LiFePO4, Li3V2(PO4)3 and LiVPO4F is going to be synthesized, the formation procedure mechanism, the structure properties and the microstructure control are to be studied. The composite cathode material to be synthesized through solid state calcining. The formation procedure mechanism, crystalline structure, microstructure and surface structure are characterized by using mdern analytical means.The surface electrochemical performance，Kinetics of Li-ion Extraction/Insertion process, and the structure changes of the material after using in batteries are characterized by electrochemical analysis. The microstructure control is achieved by controlling the synthesis process (vary the ratio of x:y, doping, change the temperature and the time).This research is to clarify the formation procedure mechanism, the relationship between structure properties and the electrochemical performances. And to acquire the mechanism of microstructure control for composite cathode material.