A HIGH-RATED-VOLTAGE ALUMINUM SOLID ELECTROLYTIC CAPACITOR WITH AN ELECTROCONDUCTING-POLYMER ELECTROLYTE

This paper deals with a high-rated-voltage specialty polymer capacitor (SPC) which is a kind of aluminum solid electrolytic capacitor using electropolymerized polypyrrole (PPB) as an electrolyte. We found that PPy doped with alkylphosphate (AP) gives a much higher breakdown volta ge to SPC than PPy doped with alkylnaphthalenesulfonate (ANS) which ha s currently been used as the electrolyte. We improved the poor environ mental stability of PPy doped with AP by partial replacing the dopant with ANS. We developed a 35 V-rated-voltage SPC in which PPy doped tog ether with AP and ANS was used as the electrolyte. The SPC had also ex cellent frequency characteristics and reliability.