Importance

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Abstract

A solid electrolytic capacitor element included in a solid electrolytic capacitor includes an anode foil that contains element Al and includes a porous part at least in a surface layer of the anode foil, a dielectric layer that covers at least a portion of a surface of the anode foil, and a solid electrolyte that covers at least a portion of the dielectric layer. The solid electrolyte contains element S, and the solid electrolyte has a first part filled in voids in the porous part in the anode foil having the dielectric layer and a second part that protrudes from the main surface of the anode foil having the dielectric layer. In elemental mapping of a cross section of the porous part using an electron probe microanalyzer, the presence ratio of the element S is 0.5% or more when the presence ratio of the element Al is taken as 100%.

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First Claim