Electrolytic capacitor and manufacturing method therefor

An electrolytic capacitor comprising:

• a cathode comprising a conductive substrate and a conductive polymer layer placed on a surface of the conductive substrate;
• an anode comprising a substrate composed of a valve metal and a dielectric layer composed of an oxide of the valve metal that is placed on a surface of the substrate and is so placed that the dielectric layer and the conductive polymer layer of the cathode face each other through a space;
• and
• an ion-conductive electrolyte filled in the space,
• wherein the conductive substrate of the cathode has a foil shape,
• the conductive polymer layer of the cathode is an electropolymerized film having a thickness of 200 to 2450 nm,
• the substrate of the anode has a foil shape,
• the ion-conductive electrolyte in contact with the conductive polymer layer of the cathode has no electron conductivity, and
• the conductive polymer layer of the cathode that is in contact with the ion-conductive electrolyte expresses a redox capacity when a voltage is applied between the anode and the cathode in using the electrolytic capacitor.