CPC H01G 9/0425 (2013.01) [H01G 9/042 (2013.01); H01G 9/055 (2013.01)] | 19 Claims |
1. An electrode body used for a cathode of an electrolytic capacitor, comprising:
a cathode foil made of a valve acting metal, having an enlarged surface layer formed on a surface; and
a carbon layer formed on the enlarged surface layer,
wherein
an interface between the enlarged surface layer and the carbon layer has an uneven shape;
the enlarged surface layer is formed by digging a plurality of etching pits;
a diameter of the etching pit is 0.12 μm or more and 0.43 μm or less near a surface layer;
a depth of the etching pit is 1.5 μm or more and 5.0 μm or less;
in the uneven shape, a distance between both ends in a cross section obtained by cutting a convex region along a height direction is 1.5 μm or more and 8.0 μm or less; and
the uneven shape has the convex region height of 0.15 μm or more and 0.80 μm or less.
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