Solid electrolytic capacitor and method for manufacturing same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYukifumi Takeda, Tomoko Hosokawa, Masato Ozawa, Shin Yakushiji, Yukihiro Nitta
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Abstract
The solid electrolytic capacitor comprises: dielectric oxide film 2; solid electrolyte 3 composed of a conductive polymer; carbon layer 4; and silver layer 5, formed sequentially on a surface of anode 1 composed of a valve metal. The capacitor has excellent leakage current characteristics and electrical characteristics under hot and humid conditions due to doped naphthalenesulfonic acid compounds in the conductive polymer.
Claims22
A solid electrolytic capacitor comprising:
- an anode composed of a valve metal on that surface a dielectric oxide film is formed;
- a solid electrolyte composed of a conductive polymer formed on the dielectric oxide film;
- and
- a cathode formed on the solid electrolyte,
- wherein the solid electrolyte includes naphthalenesulfonic acid compounds.
A method of manufacturing a solid electrolytic capacitor, the capacitor comprising:
- an anode composed of a valve metal on that surface a dielectric oxide film is formed;
- a solid electrolyte composed of a conductive polymer formed on the oxide film;
- and
- a cathode formed on the solid electrolyte;
- the method comprising:
- immersing the anode into a solution for polymerization containing a monomer forming the conductive polymer, naphthalenesulfonic acid compounds and water;
- and
- forming the solid electrolyte on the oxide film by a electrolytic polymerization or a chemical polymerization.
Dependencies are inferred from the claim text.