Investigations on the synthesis and electrochemical performance of LiVPO4F/C by different methods
(0) LiVPO4F/C samples were synthesized by one-step solid-state reaction and two-step solid-state reaction methods,respectively.The structure and morphology of LiVPO4F /C samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).Electrochemical performances were characterized by charge/discharge,cyclic voltammetry and AC impedance measurements.XRD results show that the LiVPO4F/C sample prepared by one-step solid-state reaction method had the same triclinic structure (space group) as that synthesized by conventional two-step solid-state reaction.SEM image exhibits that the particle size of LiVPO4F /C prepared by one-step solid-state reaction method is smaller than that synthesized by two-step solid-state reaction.LiVPO4F/C with smaller grain size shows better performances in terms of the discharge capacity and cycle stability.The improved electrochemical properties of the LiVPO4F /C are attributed to the depressed grain size and enhanced electrical conductivity produced via one-step solid-state reaction method using oxalic acid as both reduction agent and carbon sources.AC impedance measurements also show that the LiVPO4F/C synthesized by one-step solid-state reaction route significantly decreased the charge-transfer resistance.
Lithium-ion batteries Cathode material LiVPO4F Cyclic voltammogram (CV)
Liu Jiequn Zhong Shengkui Wu Ling Wan Kang
Shagang School of Iron and Steel, Soochow University, Suzhou 215021 Shagang School of Iron and Steel, Soochow University, Suzhou 215021; College of Chemistry and Chemic
国际会议
上海
英文
114-114
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）