Electrical conducting polymer, solid electrolytic capacitor and manufacturing method thereof
AssigneeShowa Denko K.K.
InventorsHideki Ohata, Koro Shirane, Ryuji Monden, Atsushi Sakai
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Abstract
The present invention relates to a solid electrolytic capacitor comprising an electrode produced by forming a solid electrolytic layer comprised by a polymer having at least one repeating unit selected from a thiophene-diyl skeleton, an isothianaphthene-diyl skeleton, a pyrrole-diyl skeleton, a furan-diyl skeleton and an iminophenylene skeleton and having a fibril structure on a dielectric film layer of a porous valve-acting metal and its production method, and to a highly electroconductive polymer obtained by chemical oxidative polymerization of a monomer and an oxidizing agent at an interface and its production method.
Claims28
A solid electrolytic capacitor comprising a dielectric film layer on a porous valve-acting metal and a solid electrolytic layer formed on said dielectric film layer, wherein said solid electrolytic layer comprises an electroconductive polymer in layers, said electroconductive polymer having an electroconductivity of from about 0.1 to about 200 S/cm and having a scaly fibrillar structure with an outer diameter in the range of about 3 nm to about 100 nm, the electroconductive polymer layers being formed inside a cathode and on the outer surface of the metal, void spaces partially remaining between adjacent polymer layers.
A method for producing a solid electrolytic capacitor comprising a solid electrolytic layer composed of a polymer in layers, said electroconductive polymer having an electroconductivity of from about 0.1 to about 200 S/cm having a scaly fibrillar structure with an outer diameter in the range of about 3 nm to about 100 nm on a dielectric film layer of a porous valve-acting metal, wherein the polymer layers are formed inside a cathode and on the outer surface of the metal, void spaces partially remaining between adjacent polymer layers, which comprises the step of contacting a polymerizable monomer with a single solution containing an oxidizing agent having a polymerization initiating ability kept in the saturated or supersaturated state or a mixed solution containing the oxidizing agent and an electrolyte having a doping action on said dielectric film, thereby forming a composition in the form of a film of a polymer having a fibril structure on said dielectric film.
A method for producing a solid electrolytic capacitor, comprising a solid electrolytic layer composed of a polymer in layers, said polymer having an electroconductivity of from about 0.1 to about 200 S/cm having a scaly fibrillar structure with an outer diameter in the range of about 3 nm to about 100 nm on a dielectric film layer of a porous valve-acting metal, wherein the polymer layers are formed inside a cathode and on the outer surface of the metal, void spaces partially remaining between adjacent polymer layers, which comprises the step of contacting a solution having dissolved therein a polymerizable monomer alone or together with an electrolyte having a doping action with a single solution containing an oxidizing agent having a polymerization initiating ability kept in the saturated or supersaturated state or a mixed solution containing the oxidizing agent and an electrolyte having a doping action on said dielectric film, thereby forming a composition in the form of a film of a polymer having a fibril structure on said dielectric film.
A method for producing a solid electrolytic capacitor comprising a solid electrolytic layer composed of a polymer having a fibril structure on a dielectric film layer of a porous valve-acting metal, which comprises the step of contacting a polymerizable monomer with a single solution containing an oxidizing agent having a polymerization initiating ability kept in the saturated or supersaturated state or a mixed solution containing the oxidizing agent and an electrolyte having a doping action on said dielectric film, thereby forming a composition in the form of a film of a polymer having a fibril structure on said dielectric film, wherein the oxidizing agent having a polymerization iitiating ability is at least one compound selected from persulfates, bichromates and trivalent iron salts.
A method for producing a solid electrolytic capacitor comprising a solid electrolytic layer composed of a polymer having a fibril structure on a dielectric film layer of a porous valve-acting metal, which comprises the step of contacting a solution having dissolved therein a polymerizable monomer alone or together with an electrolyte having a doping action with a single solution containing an oxidizing agent having a polymerization initiating ability kept in the saturated or supersaturated state or a mixed solution containing the oxidizing agent and an electrolyte having a doping action on said dielectric film, thereby forming a composition in the form of a film of a polymer having a fibril structure on said dielectric film, wherein said oxidizing agent having a polymerization initiating ability is at least one compound selected the group consisting of from persulfates, bichromates and trivalent iron salts.
Dependencies are inferred from the claim text.