NEW ELECTROLYTIC CAPACITORS WITH A POLYPY RROLE COUNTERELECTRODE

In this paper we describe the characteristics of new solid electrolyti c capacitors (aluminum or tantalum type) in which the conventional cou nterelectrode is replaced by conducting polymer A thick layer of polyp yrrole is directly deposited on the dielectric surface by chemical oxi dative polycondensation. By a precise control of the deposit condition s of the polymer we obtain a high specific capacitance value (approxim ately 2muFV/mm3). The final capacitor device has excellent impedance-f requency characteristics comparable to the ceramic capacitors. We demo nstrate that the stability of the capacitors is a function of the dopi ng ion.