The present invention is directed to a conductive electrolyte for use in
high voltage electrolytic capacitors and to an electrolytic capacitor
impregnated with the electrolyte of the present invention for use in an
implantable cardioverter defibrillator (ICD). The electrolyte according to
the present invention is composed of a two solvent mixture of ethylene
glycol and a polar organic cosolvent. Dissolved in this mixture is a
combination of: a high dielectric cosolvent, a long chain monocarboxylic
acid and an aliphatic dicarboxylic acid of carbon chain length from eight
to thirteen (C.sub.8 to C.sub.13). The solution is then neutralized with
an amine. A cathode depolarizer, or degassing agent may be added to reduce
the amount of gas produced during capacitor life. Hypophosphorous acid may
be added to enhance the life characteristics of the electrolyte. The water
content may be adjusted with deionized water to achieve a Karl Fischer
titration (water content) measurement of about 1.0% to about 8.0% to
achieve proper age characteristics.
