Electrolytic capacitor having a high capacitance and a low equivalent series resistance and method for producing the same

An electrolytic capacitor, comprising a capacitor element, wherein

• the capacitor element includes an anode body having a dielectric layer at a surface of the anode body, an electrolyte covering part of the dielectric layer, and a liquid component,
• the electrolyte contains a conjugated polymer, a polymer dopant having an anionic group, and a metal ion,
• the electrolyte includes a first portion on the dielectric layer side, and a second portion covering at least part of the first portion, and
• a content C1 of the metal ion in the first portion and a content C2 of the metal ion in the second portion satisfy C1>C2.

A method for producing an electrolytic capacitor including a capacitor element that includes an anode body having a dielectric layer on a surface of the anode body, and an electrolyte covering part of the dielectric layer, the method comprising:

• a step of preparing a liquid mixture containing a conjugated polymer, a first polymer dopant having an anionic group, and a lithium ion, an amount of the lithium ion being 0.1 equivalents or more and 0.95 equivalents or less, relative to 1 equivalent of the anionic group;
• and
• a step of applying the liquid mixture onto the anode body, to form the electrolyte, wherein
• the step of preparing a liquid mixture includes
• a sub-step of polymerizing a precursor of the conjugated polymer in a presence of the first polymer dopant and an oxidizing agent, to obtain a first mixture containing the conjugated polymer and the first polymer dopant, and
• a sub-step of further mixing the lithium ion with the first mixture, to prepare the liquid mixture as a second mixture.