| abstract |
An object of the present invention is to provide a high performance and downsized aluminum electrolytic capacitor with excellent corrosion resistance by improving the capacitance of the cathode foil and reducing the potential difference between the lead wire and the cathode foil. To do. A capacitor element 19 in which an anode foil 11 and a cathode foil 12 are wound together with a separator 13, and a driving electrolyte solution 14 is impregnated in the capacitor element 19 and incorporated in a bottomed cylindrical metal case 18, In the aluminum electrolytic capacitor in which the opening of the metal case 18 is sealed with the sealing plate 17, the surface of the cathode foil is covered with a porous carbon layer having a specific surface area of 50 m 2 / g or more. [Selection] Figure 1 |