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Research on supercapacitor performance of V2O5/graphite composite material

WANG Hong,TANG Zhiyuan,LI Zhongyan,LIU Yong,XIE Hui   

  1. School of Chemical Engineering and Technology,Tianjin University; McNair Technology Co.,Ltd.
  • Online:2008-07-05 Published:2008-07-05

V2O5/石墨复合材料的电容性能

王 虹,唐致远,李中延,柳 勇,谢 辉   

  1. 天津大学化工学院;东莞迈科科技有限公司

Abstract: V2O5 was synthesized by the sol-gel process. Graphite was doped into V2O5 through ball milling. Scanning electron microscopy (SEM),X-ray diffraction (XRD), cyclic voltammetry, and electrochemical impedance spectroscopy indicated that graphite could change the microstructure and composition of V2O5 electrodes. The non-symmetric electrochemical capacitors consisting of V2O5/C composite material and graphite, 1mol/L LiClO4(EC:DEC =1:1)organic solution as electrolyte, reached the specific energy of 18.3wh/kg and the capacity attenuation of 25.68% after cycling 400 times. The specific capacity and cycling performance were dramatically improved as compared with V2O5 without doping.

摘要: 溶胶凝胶法制备V2O5,采用球磨法将V2O5与石墨进行固相混合,经扫描电镜(SEM)、X射线衍射(XRD)、循环伏安、交流阻抗等测试手段分析,得出石墨可改变V2O5电极的微结构和组成;由20%V2O5/C复合材料和石墨组成的非对称电化学电容器,以1 mol/L LiClO4(EC:DEC=1:1)有机溶液为电解液,比能量可达到18.3 W·h/kg,比纯V2O5提高56.8%,循环400次后复合材料的容量衰减为25.68%,比容量和循环性能较掺杂前得到显著提高。

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