中文摘要：

利用碳热还原法，通过两步反应合成了LiVPO4F／C复合正极材料。主要研究了球磨、碳含量和电解液对样品结构和电化学性能的影响。结果表明：球磨2h在750℃下能合成纯的LiVPO4F产品，剩余碳的存在使LiVPO4F的粒径减小且分布较为均匀，同时提高了颗粒之间的导电性。对样品进行电化学性能测试表明，含碳量为1．83％的LiVPO4F／C的样品比容量和循环性能都得到显著改善；合适的电解液可以明显提高样品LiVPO4F的电化学性能。含碳量为1．83％的LiVPO4F／C的复合材料以1mol.L^-1 LiPF6/EC＋EMC＋DMC（体积比1：1：1）为电解液，在0．2C的倍率下放电时，其首次放电容量为119mAh·g^-1，放电平台在4．2V左右（vs．Li），循环30次后比容量为89mAh·g^-1。

英文摘要：

The LiVPO4F/C was prepared by a two-step reactions based on a carbon thermal reduction （CTR）. Effects of baLL miLLing and carbon contents on the crystalline structure, morphology of particles and properties of LiVPO4F were investigated. The results showed that the pure LiVPO4F was successfully synthesized at 750℃, with the raw starting materials mixed by ball milling for 2 h. The results of XRD show that the LiVPO4F/C is pure triclinic structure. Residual carbon during processing was coated on LiVPO4F, preventing the particle aggregation and resulting in the enhancement of the material electronic properties. When 1 mol/L LiPF6 in EC：EMC：DMC（1：1：1 in volume） was selected as eLectroLyte, the discharge capacity of the LiVPO4F/C coated with about 1.83% carbon synthesized is 119 mAh.g^-1 at 0.2 C rate with an average discharge voltage of 4.2 V （vs. Li/Li^＋）, and the capacity retains of 89 mAh·g^-1 after 30 cycles.