Solid electrolytic capacitor and method for producing solid electrolytic capacitor

Abstract

The present disclosure provides a solid electrolytic capacitor and a production method thereof which improve the opportunity to repair defects and reduce leakage current. An electrolytic capacitor includes a capacitor element, a conductive polymer layer, and electrolytic solution. The capacitor element is formed by facing anode foil and a cathode body. The conductive polymer layer is formed by impregnating dispersion including a solvent and particles or powder of a conductive polymer. The electrolytic solution is impregnated in the capacitor element. Here, the cathode body includes cathode foil and a carbon layer. The cathode foil is formed of valve action metal, and an enlarged surface layer is formed on a surface thereof. The carbon layer is laminated on the enlarged surface layer and contacts with the conductive polymer layer at a surface opposite the enlarged surface layer. Also, the amount of the particles or powder of the conductive polymer included in the enlarged surface layer is less than the particles or powder of the conductive polymer included in the carbon layer at the surface-layer side facing the conductive polymer layer.