Solid electrolytic capacitor and process for producing the same

A process for producing a solid electrolytic capacitor comprising the steps of:

• winding an anode electrode foil and a cathode electrode foil through the medium of a separator to fabricate a capacitor element;
• and allowing the fabricated capacitor element to be impregnated with 3,4-ethylenedioxythiophene and an oxidant to form poly(ethylenedioxythiophene) by chemical polymerization, said process further comprising:
• in the foil winding step, a nonwoven fabric composed chiefly of a synthetic fiber being used as the separator;
• and the steps of:
• dissolving and removing a binder in the separator, by dipping the capacitor element wound by using the separator in water at 80° C. to 100° C. for one to 10 minutes;
• and
• after the binder dissolving and removing step, for the binder-removed capacitor element, the impregnation step with the 3,4-ethylenedioxythiophene and the oxidant is performed.

A process for producing a solid electrolytic capacitor comprising the steps of:

• winding an anode electrode foil and a cathode electrode foil through the medium of a separator to fabricate a capacitor element;
• and allowing the fabricated capacitor element to be impregnated with 3,4-ethylenedioxythiophene and an oxidant to form poly(ethylenedioxythiophene) by chemical polymerization, said process further comprising:
• the impregnation step including the steps of:
• allowing the capacitor element to be impregnated with a monomer 3,4-ethylenedioxythiophene;
• and
• after the monomer impregnation step, allowing the resulting capacitor element to be impregnated with an oxidant.

A process for producing a solid electrolytic capacitor comprising the steps of:

• winding an anode electrode foil and a cathode electrode foil through the medium of a separator to fabricate a capacitor element;
• and allowing the fabricated capacitor element to be impregnated with 3,4-ethylenedioxythiophene and an oxidant to form poly(ethylenedioxythiophene) by chemical polymerization, said process further comprising:
• the impregnation step including the steps of:
• allowing the capacitor element to be impregnated with a monomer solution of a mixture of 3,4-ethylenedioxythiophene and a volatile solvent;
• after the monomer solution impregnation step, subjecting the resulting capacitor element to thermal treatment;
• and
• after the thermal treatment step, allowing the capacitor element to be impregnated with an oxidant solution.