Patent ID: 8416557

Claim:
A solid electrolytic capacitor comprising: an anode foil; an solid electrolyte provided on the anode foil and made of conductive polymer; and a cathode foil provided on the solid electrolyte and facing the anode foil across the solid electrolyte, wherein the anode foil includes an anode base made of aluminum, a first rough surface layer made of aluminum and provided on a first surface of the anode base, and a first dielectric oxide layer provided on the first rough surface layer and contacting the solid electrolyte, the cathode foil includes a cathode base made of aluminum, and a nickel layer provided on a surface of the cathode base and contacting the solid electrolyte, the nickel layer facing the first dielectric oxide layer of the anode foil across the solid electrolyte, the nickel layer being made of nickel and nickel oxide, the surface of the cathode foil is roughened and has a plurality of pores therein, and the nickel layer is not formed inside the plurality of pores in the surface of the cathode foil.