Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Increase in Discharge Capacity of Li Battery Assembled with Electrochemically Prepared V2O5/polypyrrole-composite-film Cathode

  • Kim, You-Na (Division of Energy Systems Research, Ajou University) ;
  • Kim, Joo-Seong (Division of Energy Systems Research, Ajou University) ;
  • Thieu, Minh-Triet (Division of Energy Systems Research, Ajou University) ;
  • Dinh, Hung-Cuong (Division of Energy Systems Research, Ajou University) ;
  • Yeo, In-Hyeong (Department of Chemistry, Dongguk University) ;
  • Cho, Won-Il (Advanced Battery Center, Korea Institute of Science and Technology) ;
  • Mho, Sun-Il (Division of Energy Systems Research, Ajou University)
  • Received : 2010.07.16
  • Accepted : 2010.09.14
  • Published : 2010.11.20
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Abstract

Flexible composite films of $V_2O_5$ and conductive polypyrrole ($V_2O_5$/PPy) were grown by facile electrochemical polymerization, wherein an anodization potential was applied to the substrate electrode in an electrolyte solution containing pyrrole monomer and dispersed $V_2O_5$ particles. The coating of polypyrrole (PPy) on the surface of $V_2O_5$ particles was induced by the oxidative catalytic action of $V_2O_5$ during the electrochemical polymerization of pyrrole. PPy in the composite film connects the isolated $V_2O_5$ particles. This results in the formation of conductive networks in the composite film cathode, thereby enhancing the Li+ ion diffusion to the surface of the isolated $V_2O_5$ particles and thus increasing the accessibility of the $Li^+$ ions. The specific capacity tests of the Li rechargeable batteries revealed that the discharge capacity of this composite film cathode was higher, i.e., $497\;mAhg^{-1}$, than that of $V_2O_5$/PPy powder or pristine $V_2O_5$.

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