Patent ID: 10790098

Abstract:
An electrolytic capacitor includes a capacitor element and an electrolyte solution. The capacitor element includes an anode foil, a cathode foil opposite to the anode foil, and a conductive polymer layer disposed between the anode foil and the cathode foil. A dielectric layer is formed on the anode foil. An inorganic layer is formed on the cathode foil. The conductive polymer layer includes a conductive polymer. The inorganic layer has a surface having projections and recesses. The projections form a region where the inorganic layer is in contact with the conductive polymer layer and the recesses form a region where the inorganic layer is not in contact with the conductive polymer layer. A proportion of water in the electrolyte solution ranges from 0.1% by mass to 6.0% by mass, inclusive.