Solid electrolytic capacitor and fabrication method therefor
AssigneeSanyo Electric Co., Ltd.
InventorsTakahisa IIda, Mutsumi Yano, Mamoru Kimoto, Yasumi Kobayashi, Hiroshi Nonoue
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Abstract
A solid electrolytic capacitor comprising: an anode of valve metals or alloy of which main component is valve metals; a dielectric layer formed by anodizing the anode; and a cathode formed on the dielectric layer, wherein the dielectric layer comprises a first dielectric layer located on the anode side and a second dielectric layer formed on the first dielectric layer, and oxygen concentration of the second dielectric layer is decreased from the first dielectric layer side toward the cathode side.
Claims12
A solid electrolytic capacitor comprising:
- an anode of valve metals or alloy of which main component is valve metals;
- a dielectric layer formed by anodizing said anode;
- and a cathode formed on said dielectric layer;
- wherein the dielectric layer comprises a first dielectric layer located on the anode side and a second dielectric layer formed on said first dielectric layer, and oxygen concentration of said second dielectric layer is decreased from the first dielectric layer side toward the cathode side.
A fabrication method for solid electrolytic capacitor comprising the steps of:
- manufacturing an anode of valve metals or alloy of which main component is valve metals;
- forming a dielectric layer by anodizing said anode;
- forming a cathode on said dielectric layer;
- and
- anodizing the anode in an aqueous electrolyte including hexafluoride ion in the step of forming the dielectric layer.
Dependencies are inferred from the claim text.