PURPOSE: To increase energy density by immersing a current collector and a conductor in an electrolytic polymerization solution and passing constant current between them for electrolytic polymerization.
CONSTITUTION: A thin film of conductive polymer is formed by electrolytic polymerization on the surface of a current collector 12 comprising conductive material such as aluminium and used as a positive electrode for a plastic battery. At the same time, lithium is deposited on the each surface of conductors 14, 16 and is used as a negative electrode. For this purpose, the current collector 12 is connected to the positive electrode side of a power source and the conductors 14, 16 facing the current collector 12 are connected to the negative electrode side of the power source. The current collector 12 and the conductors 14, 16 are immersed in an electrolyte 18, and constant current is passed between them at 5°C or less for electrolytic polymerization. Thereby, deterioration of negative electrode is prevented and energy density is increased.
YOKOISHI SHOJI
ONISHI TORU
