Positive electrode body of solid electrolytic capacitor, solid electrolytic capacitor, method for manufacturing positive electrode body of solid electrolytic capacitor, and method for manufacturing solid electrolytic capacitor

Abstract

Provided are: a positive electrode body of a solid electrolytic capacitor that has a high withstand voltage and a low leakage current; a solid electrolytic capacitor; a method for manufacturing the positive electrode body of the solid electrolytic capacitor; and a method for manufacturing the solid electrolytic capacitor. This positive electrode body comprises: a valve action metal substrate; and a dielectric oxide film on the valve action metal substrate. The dielectric oxide film comprises: a void layer on a surface layer side of the dielectric oxide film; and a void repair layer on the side of the dielectric oxide film that interfaces with the valve action metal substrate. This positive electrode body is formed by first chemical conversion processing, void introduction processing, and second chemical conversion processing. In the first chemical conversion processing, a prescribed chemical conversion voltage is applied to the valve action metal substrate. In the void introduction processing, the positive electrode body is immersed in one or more of an acidic solution, an alkaline solution, and pure water. In the second chemical conversion processing, a chemical conversion voltage lower than that of the first chemical conversion treatment is applied.