Method for manufacturing a solid electrolytic capacitor

1. A method for manufacturing a solid electrolytic capacitor, the method comprising:

mixing valve metal powders with organic binder for granulation;

press-molding granulated powders embedded with a valve metal lead to provide a compact;

sintering the compact in a vacuum to produce a sintered body;

cathode-electrolytic cleaning the sintered body to produce a cleaned sintered body; and

anodizing the cleaned sintered body to form a dielectric oxide film layer thereon;

wherein the cathode-electrolytic cleaning of the sintered body is performed before forming the dielectric oxide film layer.

2. A method for manufacturing a solid electrolytic capacitor according to claim 1 , wherein the cathode-electrolytic cleaning is performed in an acid solution.

3. A method for manufacturing a solid electrolytic capacitor according to claim 2 , wherein the acid solution is a mixed acid solution of hydrofluoric acid, nitric acid, and sulfuric acid.

4. A method for manufacturing a solid electrolytic capacitor according to claim 2 , wherein the acid solution is a mixed acid solution of nitric acid and sulfuric acid.

5. A method for manufacturing a solid electrolytic capacitor according to claim 1 , wherein the cathode-electrolytic cleaning is performed in a sodium hydrate aqueous solution.

6. A method for manufacturing a solid electrolytic capacitor according to claim 1 , wherein the valve metal powders comprise tantalum powders.

7. A method for manufacturing a solid electrolytic capacitor according to claim 1 , further comprising:

forming a cathode layer including an electrolytic layer on the dielectric oxide film layer;

connecting the cathode layer to a cathode terminal with conductive adhesives;

connecting the anode lead to an anode terminal; and

molding an entire element with resin with the anode terminal and the cathode terminal exposed at the bottom of the capacitor.

8. A method for manufacturing a solid electrolytic capacitor according to claim 7 , wherein forming the cathode layer comprises:

forming a graphite layer on the electrolytic layer;

and forming a silver layer on the graphite layer.

9. A solid electrolytic capacitor manufactured according to claim 1 , wherein the solid electrolytic capacitor comprises a solid electrolytic tantalum capacitor.

10. A method for manufacturing an anode body for use in a solid electrolytic capacitor, the method comprising:

mixing valve metal powders with organic binder for granulation;

press-molding granulated powders embedded with a valve metal lead to provide a compact;

sintering the compact in a vacuum to produce a sintered body;

cathode-electrolytic cleaning the sintered body; and

anodizing the sintered body to form a dielectric oxide film layer thereon;

wherein the cathode-electrolytic cleaning of the sintered body is performed before forming the dielectric oxide film layer.

11. A method for manufacturing an anode body for use in a solid electrolytic capacitor according to claim 10 , wherein the cathode-electrolytic cleaning is performed in an acid solution.

12. A method for manufacturing an anode body for use in a solid electrolytic capacitor according to claim 11 ,

wherein the acid solution is a mixed acid solution of hydrofluoric acid, nitric acid, and sulfuric acid.

13. A method for manufacturing an anode body for use in a solid electrolytic capacitor according to claim 11 , wherein the acid solution is a mixed acid solution of nitric acid and sulfuric acid.