A liquid component for an electrolytic capacitor includes at least one central atom selected from the group consisting of boron, aluminum, and silicon, and a ligand having a plurality of ligand atoms bonded to the central atom. The ligand atoms are at least one selected from the group consisting of oxygen and nitrogen, and are bonded to a carbon atom having no oxo group.

A liquid component for an electrolytic capacitor includes at least one central atom selected from the group consisting of boron, aluminum, and silicon, and a ligand having a plurality of ligand atoms bonded to the central atom. The ligand atoms are at least one selected from the group consisting of oxygen and nitrogen, and are bonded to a carbon atom having no oxo group.

An electrolytic capacitor includes a capacitor element and electrolytic solution. The capacitor element includes an anode body with an oxide film, and a solid electrolyte contacting the oxide film. The electrolytic solution contains a solvent and a solute. The solvent contains at least one selected from the group consisting of a lactone compound, a glycol compound, and a sulfone compound. The solute includes a first acid component and a base component. The first acid component includes at least one of a benzenedicarboxylic acid and a derivative of the benzenedicarboxylic acid. The base component includes at least one of an amine and an amidine. A concentration of the solute in the electrolytic solution ranges from 15% by mass to 40% by mass, inclusive. A ratio (V/Vw) of a formation voltage V of the oxide film to a rated voltage Vw of the electrolytic capacitor is less than or equal to 1.7.

An electrolytic capacitor includes a capacitor element and electrolytic solution. The capacitor element includes an anode body with an oxide film, and a solid electrolyte contacting the oxide film. The electrolytic solution contains a solvent and a solute. The solvent contains at least one selected from the group consisting of a lactone compound, a glycol compound, and a sulfone compound. The solute includes a first acid component and a base component. The first acid component includes at least one of a benzenedicarboxylic acid and a derivative of the benzenedicarboxylic acid. The base component includes at least one of an amine and an amidine. A concentration of the solute in the electrolytic solution ranges from 15% by mass to 40% by mass, inclusive. A ratio (V/Vw) of a formation voltage V of the oxide film to a rated voltage Vw of the electrolytic capacitor is less than or equal to 1.7.

In an electrolytic capacitor having a capacitor element housed inside a body case where the capacitor element has a first electrode member and a second electrode member wound up with a separator in between and where the capacitor element holding an electrolyte solution, there is provided, between the first and second electrode members, a conductive polymer particle band in which conductive polymer particles of a conductive polymer in a dense state are disposed to extend in the longitudinal direction of the separator, the conductive polymer particle band contains a cellulose derivative, and the conductive polymer particle band is provided to cover, within at least one of regions on opposite sides of the center line of the separator in its lateral direction, one half or more of the region in the lateral direction.

In an electrolytic capacitor having a capacitor element housed inside a body case where the capacitor element has a first electrode member and a second electrode member wound up with a separator in between and where the capacitor element holding an electrolyte solution, there is provided, between the first and second electrode members, a conductive polymer particle band in which conductive polymer particles of a conductive polymer in a dense state are disposed to extend in the longitudinal direction of the separator, the conductive polymer particle band contains a cellulose derivative, and the conductive polymer particle band is provided to cover, within at least one of regions on opposite sides of the center line of the separator in its lateral direction, one half or more of the region in the lateral direction.

Provide is an electrolytic capacitor for a middle-to-high voltage application that is equal to or higher than 100 V which suppresses the total amount of gas to be produced in the electrolytic capacitor. The anode foil of the electrolytic capacitor includes an enlarged surface portion provided with tunnel-shape pits formed from the foil surface in the thickness direction of the foil, and a dielectric oxide film formed on the surface of the enlarged surface portion. The cathode body of the electrolytic capacitor includes a cathode foil formed of a valve acting metal, and a carbon layer formed on the cathode foil.

Provide is an electrolytic capacitor for a middle-to-high voltage application that is equal to or higher than 100 V which suppresses the total amount of gas to be produced in the electrolytic capacitor. The anode foil of the electrolytic capacitor includes an enlarged surface portion provided with tunnel-shape pits formed from the foil surface in the thickness direction of the foil, and a dielectric oxide film formed on the surface of the enlarged surface portion. The cathode body of the electrolytic capacitor includes a cathode foil formed of a valve acting metal, and a carbon layer formed on the cathode foil.

A method for producing an electrolytic capacitor, the electrolytic capacitor including a capacitor element including an anode body and a cathode body each having a foil shape. The anode body includes a dielectric layer on a surface of the anode body. The method includes a step of forming a capacitor element precursor by winding or stacking a separator, the anode body, and the cathode body with the separator interposed between the anode body and the cathode body, a step of impregnating the capacitor element precursor with a treatment liquid containing an acid component, a solvent, and a conductive polymer component, a step of impregnating the capacitor element precursor with a liquid component after the step of impregnating the capacitor element precursor with the treatment liquid, and a step of forming the capacitor element by eluting the acid component into the liquid component.

A method for producing an electrolytic capacitor, the electrolytic capacitor including a capacitor element including an anode body and a cathode body each having a foil shape. The anode body includes a dielectric layer on a surface of the anode body. The method includes a step of forming a capacitor element precursor by winding or stacking a separator, the anode body, and the cathode body with the separator interposed between the anode body and the cathode body, a step of impregnating the capacitor element precursor with a treatment liquid containing an acid component, a solvent, and a conductive polymer component, a step of impregnating the capacitor element precursor with a liquid component after the step of impregnating the capacitor element precursor with the treatment liquid, and a step of forming the capacitor element by eluting the acid component into the liquid component.