动力锂离子电池正极材料磷酸钒锂制备方法

锂离子电池新型正极材料的开发是当前的研究热点,其中磷酸盐材料以其结构稳定、安全性能好及资源丰富等优点备受关注。磷酸钒锂理论能量密度可达500mWh/g,具有较高的电子离子导电性、理论充放电容量及充放电电压平台,被认为是一种极具竞争优势和应用前景的动力锂离子电池正极材料。传统磷酸钒锂合成方法有固相合成法、碳热还原法、溶胶凝胶法和水热合成法等,近年来,又出现了湿法固相配位法、微波固相合成法和流变相法等新型合成方法。本文简要介绍了磷酸钒锂的结构和性能特点,对磷酸钒锂制备方法的最新研究进展进行了较为全面的阐述,并详细介绍了本研究团队近年来在磷酸钒锂材料新型合成方法方面的探索成果。同时对各种合成方法的制备工艺及材料性能进行了对比分析,并探讨了当前存在的问题及未来的研究方向。

Preparation of Li3V2(PO4)3 Cathode Material for Power Li-Ion Batteries

A considerable amount of effort has been invested to find new cathode materials suitable for rechargeable lithium batteries,and lithium transition metal phosphates have attracted wide attention because of their high structural stability,reliability and abundant resources.Lithium vanadium phosphate(LVP) has high energy density of 500mWh/g,high electron and ionic conductivity,high theoretical charge and discharge capacity,and high charge and discharge voltage plateau.It is considered as one of the most promising cathode materials for power lithium batteries.Lithium vanadium phosphate has been prepared by some traditional synthetic methods such as solid-state reaction route,carbon thermal reduction,sol-gel method and hydrothermal synthetic method,while in recent years several new synthetic methods,such as wet coordination method,microwave solid-state synthetic method,rheological phase method,have drawn researchers’ attention.In this paper,the structure and the characters of lithium vanadium phosphate are introduced.The recent research progress on synthesis study of lithium vanadium phosphate is systematically reviewed,and the results of our research team focused on the exploration of new preparation technology for lithium vanadium phosphate in recent years are elaborated.Furthermore,the preparing techniques and the material properties for each method are compared,and the current problems as well as the corresponding research directions are discussed.