Method for preparing anode electrode for high voltage electrolytic capacitor
AssigneeKorea Advanced Institute of Science and Technology
InventorsSu Il Pyun, Woo Jin Lee
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Abstract
Disclosed is a method for forming an aluminum oxide film of a large surface area on an electrode for a high voltage electrolytic capacitor. In accordance with the method, an oxide film of a uniform thickness is formed, prior to a process of etching the oxide film. A re-anodization is then partially conducted for an etched portion of the oxide film. The resultant oxide film has an increased surface area. The method of the invention makes it possible to prepare a dielectric oxide film having characteristics of a uniform thickness and a large surface area. In accordance with the invention, it is possible to expect an increase in the capacitance of electrolytic capacitors.
Claims5
A method for preparing an anode electrode of a high voltage electrolytic capacitor, comprising the steps of:
- anodizing an aluminum foil in a boric acid solution, thereby forming an oxide film of a uniform thickness on the aluminum foil;
- partially etching the aluminum foil, formed with the oxide film, in an NaCl solution containing sulfate ions;
- and
- re-anodizing the etched aluminum foil, thereby forming again an oxide film on the etched aluminum foil.
Dependencies are inferred from the claim text.