Electrode foil for electrolytic capacitor, electrolytic capacitor, and methods for manufacturing same

An electrode foil for an electrolytic capacitor, the electrode foil comprising:

• an anode electrode body including a base material part having a porous body portion;
• and
• a dielectric layer disposed on a surface of the porous body portion,
• wherein:
• the anode electrode body has a first main surface in which pores of the porous body portion are opened, a second main surface opposite to the first main surface, and an end surface connecting the first main surface and the second main surface,
• the base material part further has a core material portion that is not porous, the core material portion being disposed consecutively with the porous body portion,
• the dielectric layer is formed on the end surface in the porous body portion and on an end surface of the core material portion,
• the dielectric layer includes a first dielectric layer and a second dielectric layer, the first dielectric layer being in contact with the surface of the porous body portion, the second dielectric layer being disposed on the end surface and on the first dielectric layer, and
• in the porous body portion, a first film thickness of the second dielectric layer in an end surface vicinity region is larger than a second film thickness of the second dielectric layer in a deep inner region, the end surface vicinity region being a region within a predetermined distance from the end surface, the deep inner region being a region located away from the first main surface and at a central portion in a direction parallel to the first main surface.