Solid electrolytic capacitor, and method of manufacturing same

Claim 1

A solid electrolytic capacitor having a capacitor element comprising: a metal plate capable of having a dielectric oxidation layer formed thereon; a dielectric oxidation layer formed on a surface of said metal plate; a conductive polymer layer formed on said dielectric oxidation layer which is a polymer layer of a heterocyclic compound selected from the group consisting of pyrrole, furan and thiopene formed by electrochemical polymerization in an electrolyte solution containing said heterocyclic compound and supporting electrolyte which either comprises boric acid and any one of the following organic compounds: (1) an aliphatic or aromatic carboxylic acid, or a salt thereof; (2) an aliphatic or aromatic compound having two or more carbonyl radicals, or a salt thereof; (3) an aliphatic or aromatic compound having at least one hydroxyl radical and at least one carboxylic radical, or a salt thereof; and (4) an aliphatic or aromatic compound having at least one amine radical and at least one carboxylic radical, or a salt thereof; or comprises a boron compound obtained by chemically combining boric acid and any of the compounds (1) to (4); a conductive layer formed on said conductive polymer layer, wherein said conductive polymer layer near a defect interface of said dielectric oxidation layer is converted into an insulator; and terminals provided on each of said plate and conductive layer.