Method for manufacturing electrolytic capacitor and electrolytic capacitor

A method for manufacturing an electrolytic capacitor comprising the steps of:

• forming a capacitor element having a pair of electrode foils wound with a separator interposed therebetween;
• impregnating the capacitor element with a dispersion solution containing particles of an electrically conductive solid or aggregates thereof and a solvent to form a planar electrically conductive solid layer having the particles of the electrically conductive solid or the aggregates thereof on the surfaces of the electrode foils and the separator, in such a manner that an amount of the particles of the electrically conductive solid or the aggregates thereof in the capacitor element is 5 to 55% by volume with respect to the void volume in the inside of the capacitor element and the planar electrically conductive solid layer has a thickness of 12.6 μm or less;
• and
• impregnating the capacitor element having the electrically conductive solid layer with an electrolytic solution.

An electrolytic capacitor comprising:

• a capacitor element having a pair of electrode foils wound with a separator interposed therebetween;
• and
• a planar electrically conductive solid layer containing particles of an electrically conductive solid or aggregates thereof and an electrolytic solution in the capacitor element,
• wherein the planar electrically conductive solid layer is formed on the surfaces of the electrode foils and the separator by impregnating the capacitor element with a dispersion solution containing the particles of the electrically conductive solid or the aggregates thereof and a solvent.