纳米石墨包覆球形LiFePO_4正极材料的制备及其性能研究  

Study on Preparation and Performance of Nano-graphite Coated Spherical LiFePO_4 Cathode Material

作　　者：胡佳杰[1] 邬婷倩 钟丹萍 胡翔[1] 姚鹏基 金燕仙[1] 

机构地区：[1]台州学院医药化工学院,浙江台州318000

出　　处：《当代化工》2016年第2期244-246,共3页Contemporary Chemical Industry

基　　金：国家自然科学青年基金项目;项目号:21403150

摘　　要：采用湿球研磨-喷雾干燥法合成了纳米石墨包覆的球形LiFePO_4材料。该材料呈现了大小较为均匀的球形颗粒,颗粒度较小。性能测试表明该材料具有优异的电化学性能,最佳样品C在0.1 C时的放电比容量为160.9 m A·h·g^(-1),在高倍率5 C下的比容量仍为120.5 m A·h·g^(-1),显示了良好的比容量维持率。该法制备细小而致密的球形颗粒,并通过纳米石墨包覆增强导电性,大大提高了LiFePO_4材料的电化学性能,此方法简便、高效,有工业化应用的前景。Nano-graphite coated spherical LiFePO-4 cathode material was prepared by wet ball milling-spray drying method The results show that, prepared spherical LiFePO-4 presents the spherical particles with uniform size and small particle size, it has high density and good electrochemical performance, and presents large reversible discharge capacities of 160.9 m A·h·g^-1 and 120.5 m A·h·g^-1 at 0.1 C and 5.0 C rate, respectively. This nano-graphite coating method can improve the electrochemical properties of LiFePO-4 materials.

关 键 词：喷雾干燥法 LIFEPO4 锂离子电池 

分 类 号：O655.25[理学—分析化学]