Electrolytic capacitor comprising an electrically-conductive polymer compound and method for producing the same

A method for manufacturing an electrolytic capacitor, comprising:

• forming a capacitor element by superposing and winding an anode foil and a cathode foil via a separator, wherein the anode foil has an oxide film formed on the surface thereof and the cathode foil is optionally treated with an etching process;
• impregnating the capacitor element with an aqueous solution or dispersion of an electrically-conductive polymer compound, in order to form a solid electrolyte phase in a gap between the anode foil and the cathode foil;
• and
• after the formation of the solid electrolyte phase, impregnating the capacitor element with a liquid material phase comprising a liquid material,
• characterized in that:
• the liquid material phase comprises an aromatic nitro compound in an amount of 1.0% by mass or more,
• the liquid material is polyethylene glycol and
• in the polyethylene glycol, the proportion of polyethylene glycol which is pentaethylene glycol or larger is 30% by mass or less.