A method for forming a capacitor, a capacitor formed thereby and an improved composition for a conductive coating are described. The method includes providing an anode, forming a dielectric on the anode and forming a cathode layer over the dielectric by applying a monoamine, a weak acid and a conductive polymer.

A method for forming a capacitor, a capacitor formed thereby and an improved composition for a conductive coating are described. The method includes providing an anode, forming a dielectric on the anode and forming a cathode layer over the dielectric by applying a monoamine, a weak acid and a conductive polymer.

An electrolytic capacitor includes an anode body having a porous structure, an anode lead partially embedded in the anode body, a dielectric layer formed on a surface of the anode body, and a cathode part that covers at least part of the dielectric layer. The anode body has a first region in which first particles sintered together and a second region in which second particles sintered together. The average particle diameter D1 of the first particles is smaller than the average particle diameter D2 of the second particles. The volume-based pore diameter distribution of the anode body with the dielectric layer has a first peak in a range of less than or equal to 0.5 μm in pore diameter, and a second peak in a range of more than 0.5 μm in pore diameter.

An electrolytic capacitor includes a capacitor element. The capacitor element includes an anode including a dielectric layer thereon and a cathode member including a conductive polymer and in contact with the dielectric layer. The capacitor element is impregnated with a liquid containing at least one of polyalkylene glycol and derivatives of polyalkylene glycol. The liquid further contains an oxidation inhibitor.

An electrolytic capacitor includes a capacitor element. The capacitor element includes an anode including a dielectric layer thereon and a cathode member including a conductive polymer and in contact with the dielectric layer. The capacitor element is impregnated with a liquid containing at least one of polyalkylene glycol and derivatives of polyalkylene glycol. The liquid further contains an oxidation inhibitor.

A capacitor element that has an anode body, a dielectric oxide film layer covering the anode body, and a cathode body formed on the dielectric oxide film layer; an exterior body that covers the capacitor element; a contact layer that is on an anode terminal, which is an end portion of the anode body, and has a surface with a predetermined surface roughness; and an anode-side electrode layer that covers the surface are provided.

A capacitor element that has an anode body, a dielectric oxide film layer covering the anode body, and a cathode body formed on the dielectric oxide film layer; an exterior body that covers the capacitor element; a contact layer that is on an anode terminal, which is an end portion of the anode body, and has a surface with a predetermined surface roughness; and an anode-side electrode layer that covers the surface are provided.

Fabricating an electrode for capacitor includes performing a first set of one or more preliminary oxide formation operations on a sheet of material. The method also includes performing a capacitance test on the sheet of material so as to determine the capacitance of the sheet of material after the one or more preliminary oxide formation operations. The method proceeds on a first path in response to a first result of the capacitance test and on a second path in response to a second result of the capacitance test. The first path includes performing a second set of the one or more preliminary oxide formation operations on the sheet of material so as to reduce the capacitance of the sheet of material below the determined capacitance. The second path excludes performing any preliminary oxide formation operations on the sheet of material.

An electrolytic capacitor includes a capacitor element and a solution containing a solute. The capacitor element includes: an anode foil provided with a dielectric layer on the anode foil; a cathode foil disposed to face the anode foil; and a conductive polymer layer disposed between the anode foil and the cathode foil. The cathode foil is provided with a first layer disposed on the cathode foil, the first layer including at least one selected from the group consisting of carbon, nickel, a nickel compound, titanium, and a titanium compound. The conductive polymer layer includes a conductive polymer in contact with at least a part of a surface of the first layer. The cathode foil has a roughened surface, and the roughened surface of the cathode foil has a surface expansion rate ranging from 1.5 cm.sup.2/cm.sup.2 to 500 cm.sup.2/cm.sup.2, inclusive.

An electrolytic capacitor includes a capacitor element and a solution containing a solute. The capacitor element includes: an anode foil provided with a dielectric layer on the anode foil; a cathode foil disposed to face the anode foil; and a conductive polymer layer disposed between the anode foil and the cathode foil. The cathode foil is provided with a first layer disposed on the cathode foil, the first layer including at least one selected from the group consisting of carbon, nickel, a nickel compound, titanium, and a titanium compound. The conductive polymer layer includes a conductive polymer in contact with at least a part of a surface of the first layer. The cathode foil has a roughened surface, and the roughened surface of the cathode foil has a surface expansion rate ranging from 1.5 cm.sup.2/cm.sup.2 to 500 cm.sup.2/cm.sup.2, inclusive.