Rechargeable lithium batteries using polypyrrole-poly(styrenesulfonate) composite as the cathode-active material.

概要

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Polypyrrole–polyelectrolyte composite, obtained by electrochemical polymerization on a vapor-grown carbon fiber (VGCF) electrode, was used as a cathode-active material for a rechargeable lithium battery. Poly(styrensulfonate) ion was suitable as a dopant in terms of rechargeability of the battery. The VGCF, which has a fibrous structure, was effective as a current collector for the polymer electrode. The content of the dopant calculated by the molar ratio of sulfur and nitrogen was ca. 30%. The open-circuit voltage was 3.55 V at the time. A charge–discharge, accompanied by an Li+ deinsertion–insertion of the composite, was observed. The chargedischarge mechanism is similar to that of inorganic cathode-active materials that show Li+ intercalation. The battery was cycled stably beyond 30 times between 3.66 and 1.50 V at a constant current of 0.889 mA cm－2. An experimental capacity of 57 Ah kg－1 was obtained at the largest value on the basis of the weight of the active material. There is a possibility of developing a light-weight rechargeable battery using the polypyrrole–poly(styrenesulfonate) composite.