中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 No. 8 August 2010 |
optimized sol-gel synthesis routine
（1. Department of Biological and Chemical Engineering, Guangxi University of Technology, Liuzhou 545006, China;
2. Guangxi Key Laboratory of Environmental Engineering, Protection and Assessment,
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China;
3. Department of Material and Chemical Engineering, Guilin University of Technology, Guilin 541004, China;
4. Hunan Institute of Humanities, Science and Technology, Loudi 417000, China）
Abstract: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.
Key words: lithium ion batteries; cathode material; Li3V2(PO4)3; sol-gel method
