LiVPO4F/C复合正极材料的合成与性能

稀有金属材料与工程, 2006, 35(11): 1783-1787.

LiVPO4F/C复合正极材料的合成与性能

钟胜奎 ^1, , 尹周澜 ^2, , 王志兴 ^3, , 郭华军 ^4, , 李新海 ^5, , 陈启元 ^6,

1.中南大学,湖南,长沙,410083;桂林工学院,广西,桂林,541004

2.中南大学,湖南,长沙,410083

3.中南大学,湖南,长沙,410083

4.中南大学,湖南,长沙,410083

5.中南大学,湖南,长沙,410083

6.中南大学,湖南,长沙,410083

基金项目: 国家自然科学基金(50302016)

关键词：锂离子电池 , 正极材料 , LiVPO4F/C , 碳热还原法

Synthesis and Performance of LiVPO4F/C Composite Used as Cathode Materials

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2 h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1 mol.L-1LiPF6/EC+EMC+DMC(体积比1∶1∶1)为电解液,在0.2 C的倍率下放电时,其首次放电容量为119 mAh.g-1,放电平台在4.2 V左右(vs.Li),循环30次后比容量为89 mAh.g-1.

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