Electrodes for electrolytic capacitors and method for producing them
AssigneeAcktar Ltd.
InventorsDina Katsir, Uri Zarnitsky
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Abstract
In an anodized electrode which comprises a substrate, a vacuum deposited porous coating thereon comprising at least one substance selected from valve metals, valve metal oxides and mixtures thereof, and at least one ectrolytically produced anodized layer selected from valve metal oxides and mixtures thereof, the effective surface area is increased prior to deposition of the at least one anodized layer, e.g. by oxidizing the surface of the porous layer and removing thus formed oxide, and/or by roughening the surface of substrate mechanically, chemically and/or electrochemically, prior to vapor deposition.
Claims13
A method for preparing an anodized electrode comprising the sequential steps of:
- (1) providing a substrate;
- (2) coating the surface of the substrate by vacuum deposition thereon of a porous coating comprising at least one substance selected from valve metals, valve metal oxides and mixtures thereof;
- (3) increasing the effective surface area of said porous coating;
- and
- (4) producing electrolytically at least one anodized valve oxide layer overlaying the surface of said porous coating;
- and wherein said effective surface area increase of said porous coating is implemented by at least one of the following;
- increasing the total pore volume of said porous coating;
- increasing the average pore width in said porous coating.
Dependencies are inferred from the claim text.