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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 11
BKCSDE 31(11)
November 20, 2010

Title	Increase in Discharge Capacity of Li Battery Assembled with Electrochemically Prepared V₂O₅/polypyrrole-composite-film Cathode
Author	Youna Kim, Joo Seong Kim, Minh Triet Thieu, Hung Cuong Dinh, In Hyeong Yeo, Won Il Cho, Sun il Mho*
Keywords	Inorganic-organic composite film, Electrochemical preparation, Conducting polymer film, Li battery
Abstract	Flexible composite films of V₂O₅ and conductive polypyrrole (V₂O₅/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 V₂O₅ particles. The coating of polypyrrole (PPy) on the surface of V₂O₅ particles was induced by the oxidative catalytic action of V₂O₅ during the electrochemical polymerization of pyrrole. PPy in the composite film connects the isolated V₂O₅ 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 V₂O₅ 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 V₂O₅/PPy powder or pristine V₂O₅.
Page	3109 - 3114
Full Text	PDF

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