Synthesis and electrochemical performance of Li_3V_2(PO_4)_3 by optimized sol-gel synthesis routine  

作　　者：张倩 李艳红 钟胜奎 肖新和 颜波 

机构地区：[1]Department of Biological and Chemical Engineering,Guangxi University of Technology [2]Guangxi Key Laboratory of Environmental Engineering,Protection and Assessment,College of Environmental Science and Engineering,Guilin University of Technology [3]Department of Material and Chemical Engineering,Guilin University of Technology [4]Hunan Institute of Humanities,Science and Technology

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第8期1545-1549,共5页中国有色金属学报（英文版）

基　　金：Projects(0991025,0842003-5 and 0832259) supported by Natural Science Foundation of Guangxi Province,China;Project supported by the Joint Graduate Innovation Talent Cultivation Base of Guangxi Province,China;Project(GuiJiaoRen[2007]71) supported by the Research Funds of the Guangxi Key Laboratory of Environmental Engineering,Protection and Assessment Program to Sponsor Teams for Innovation in the Construction of Talent Highlands in Guangxi Institutions of Higher Learning,China

摘　　要：Li3V2（PO4）3 samples were synthesized by sol-gel route and high temperature solid-state reaction. The influence of Li3V2（PO4）3 as cathode materials for lithium-ion batteries on electrochemical performances was investigated. The structure of Li3Va（PO4）3 as cathode materials for lithium-ion batteries and morphology of Li3V2（PO4）3 were characterized by X-ray diffractometry （XRD） and scanning electron microscopy （SEM）. Electrochemical performances were characterized by charge/discharge and AC impedance measurements. Li3V2（PO4）3 with smaller grain size shows better performances in terms of the discharge capacity and cycle stability. The improved electrochemical properties of Li3V2（PO4）3 are attributed to the refined grains and enhanced electrical conductivity. AC impedance measurements also show that the Li3V2（PO4）3 synthesized by sol-gel route exhibits significantly decreased charge-transfer resistance and shortened migration distance of lithium ions.Li3V2(PO4)3 samples were synthesized by sol-gel route and high temperature solid-state reaction.The influence of Li3V2(PO4)3 as cathode materials for lithium-ion batteries on electrochemical performances was investigated.The structure of Li3V2(PO4)3 as cathode materials for lithium-ion batteries and morphology of Li3V2(PO4)3 were characterized by X-ray diffractometry(XRD) and scanning electron microscopy(SEM).Electrochemical performances were characterized by charge/discharge and AC impedance measurements.Li3V2(PO4)3 with smaller grain size shows better performances in terms of the discharge capacity and cycle stability.The improved electrochemical properties of Li3V2(PO4)3 are attributed to the refined grains and enhanced electrical conductivity.AC impedance measurements also show that the Li3V2(PO4)3 synthesized by sol-gel route exhibits significantly decreased charge-transfer resistance and shortened migration distance of lithium ions.

关 键 词：lithium ion batteries cathode material Li3V2（PO4）3 sol-gel method 

分 类 号：TM912[电气工程—电力电子与电力传动]