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Cyclic Stability of Electrochemically Embedded Nanobeam V[sub 2]O[sub 5] in Polypyrrole Films for Li Battery Cathodes

2010; Institute of Physics; Volume: 158; Issue: 2 Linguagem: Inglês

10.1149/1.3523315

1945-7111

Youna Kim, Quang-Thao Ta, Hung‐Cuong Dinh, Paul K. Aum, In-Hyeong Yeo, Won Il Cho, Sun‐il Mho,

Conducting polymers and applications

By utilizing a hydrothermal method, crystalline powder of nanosized beam shape—termed nanobeam —was synthesized from a xerogel. Then, using an electrochemical polymerization method, a composite film of nanobeam embedded in a conductive polypyrrole—termed electrochemically embedded /polypyrrole —was grown on anodes from an electrolyte solution containing pyrrole and dispersed nanobeam . Due to the oxidative catalytic action of for the polymerization of pyrrole, a thorough polypyrrole coating simultaneously grew on all the nanobeam particles. Both electrochemically and catalytically polymerized polypyrrole can embed and connect the isolated nanobeam particles, providing mechanical flexibility during the expanding/shrinking cycles of discharge/charge. The cathode film with loading of had a specific capacity of at , which is 99.6% of the theoretical capacity for 2 equiv. of Li intercalation, and had a specific capacity of at . With of loading, the system revealed superior cyclic stability, with a degradation rate of 2.1% and a specific capacity of , after 40 battery cycles at the rate of . The cathode performed excellently in terms of both cyclic stability and specific capacity.