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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYasuo Kudoh, Masao Fukuyama, Toshikuni Kojima, Norishige Nanai
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Solid electrolytic capacitors comprise a valve metal member having a dielectric oxide film and a conductive underlying layer formed on the member in this order, and a conductive polymer film formed on the layer. The conductive polymer film is formed by electrolytic polymerization of a polymerizable monomer contained in a system containing the monomer and a support electrolyte consisting of a compound having at least one nitro group. By this, high temperature stability of the capacitor is significantly improved. Alternatively, the electrolytic polymerization may be effected in a system which comprises a monomer, a support electrolyte and a phenol or phenoxide derivative having at least one nitro group. Methods for fabricating such capacitors are also described.
A solid electrolytic capacitor which comprises a valve metal member having a dielectric oxide film and a conductive underlying layer formed thereon in this order, and a conductive polymer film which is formed on the conductive underlying layer and is obtained by electrolytic polymerization of a polymerizable monomer, the electrolytic polymerization being effected in an electrolytic polymerization system which comprises, in a liquid medium, the polymerizable monomer and a support electrolyte which consists essentially of a compound having at least one nitro group.
A method for fabricating the solid electrolytic capacitor which comprises providing a valve metal member having a dielectric oxide film and a conductive underlying layer formed thereon, and subjecting the valve metal member tp electrolytic polymerization of a polymerizable monomer in a system which comprises, in a liquid medium, the polymerizable monomer and a support electrolyte consisting essentially of a compound having at least one nitro group, thereby forming a conductive polymer film on the conductive underlying layer.
A solid electrolytic capacitor which comprises a valve metal member having a dielectric oxide film and a conductive underlying layer formed thereon in this order, and a conductive polymer film which is formed on the conductive underlying layer and is obtained by electrolytic polymerization of a polymerizable monomer, the electrolytic polymerization being effected in an electrolytic polymerization system which comprises, in a liquid medium, the polymerizable monomer, a support electrolyte, and a compound selected from group consisting of phenol derivatives and phenoxide derivatives having at least one nitro group, thereby forming the conductive polymer film on the conductive underlaying layer.
A method for fabricating the solid electrolytic capacitor which comprises providing a valve metal member having a dielectric oxide film and a conductive underlying layer formed thereon, and subjecting the valve metal member to electrolytic polymerization of a polymerizable monomer in a system which comprises, in a liquid medium, the polymerizable monomer, a support electrolyte and a compound selected from phenol derivatives and phenoxide derivatives having at least one nitro group, thereby forming a conductive polymer film on the conductive underlaying layer.
Dependencies are inferred from the claim text.