氧化镍包覆LiV_3O_8的改性研究  

Effect of NiO coating on the electrochemical properties of LiV_3O_8 cathode material

作　　者：刘黎[1] 郭海鹏[1] 田方华[1] 周萌[1] 谭金黎[1] 王先友[1] 

机构地区：[1]湘潭大学化学学院 环境友好化学与应用教育部重点实验室,湖南湘潭411105

出　　处：《中国科技论文》2012年第9期722-725,共4页China Sciencepaper

基　　金：国家自然科学基金资助项目(51202209);高等学校博士学科点专项科研基金资助项目(20114301120007,20094301110005);湖南省自然科学基金资助项目(11JJ4038)

摘　　要：采用原位化学沉淀法,以双氧水溶胶凝胶法合成的LiV3O8为基体,Ni(NO3)2.6H2O为原料,制备了NiO包覆的LiV3O8(NiO-LiV3O8)。通过X-射线衍射(XRD)研究了材料包覆前后的结构特征,通过扫描电子显微镜(SEM)分析了材料形貌的变化,并运用恒流充放电及电化学阻抗(EIS)等电化学测试方法对包覆前后的材料进行了电化学性能研究。结果表明,NiO包覆有效地提高了材料的电化学循环性能,并减小了材料的电荷转移电阻,NiO的最佳包覆量为5%(质量分数)。The NiO coated LiV3O8has been prepared by Ni（NO3）2.6H2O and LiV3O8which was synthesized by the sol-gel method in distilled water.The effects of coating on the structure,morphology and electrochemical properties of LiV3O8have been characterized by X-ray diffraction spectroscopy（XRD）,scanning electron microscopy（SEM）,galvanostatic charge/discharge experiments and electrochemical impedance spectroscopy（EIS）.NiO nanowires were coated on the surfaces of LiV3O8powders and could be observed.It has been found that the coating can improve the electrochemical performance of LiV3O8significantly.Especially,5%（mass fraction） NiO-coated LiV3O8shows much better electrochemical performance than uncoated one.

关 键 词：LIV3O8 表面包覆 锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动]