Capacitor tantalum surface for use as a counterelectrode device

Details Capacitor tantalum surface for use as a counterelectrode device Capacitor tantalum surface for use as a counterelectrode device

1988-12-12

1990-07-17

Griffin, Donald A.

Electricity: electrical systems and devices

Electrolytic systems or devices

Liquid electrolytic capacitor

29 2503, H01G 900

Patent

active

049425005

ABSTRACT:
A counterelectrode and a method for providing the counterelectrode wherein an inherently high effective capacitance surface is formed on tantalum. The oxide forming ability of the tantalum surface is destroyed by removing existing oxide from the surface, depositing on the surface a layer of a platinum family metal, and alloying the deposited metal with the tantalum thereby forming an alloy layer. A second layer of metal, also selected from the platinum family, may then be deposited over the alloy layer. Alternately the platinum family metal may be sputtered or clad onto the surface of the tantalum with or without an alloying step. The second deposition produces a spongy layer and is accomplished by conventional electrolytic techniques.

REFERENCES:
patent: 2908849 (1959-10-01), Taylor
patent: 3628103 (1971-12-01), Booe
patent: 4020401 (1977-04-01), Cannon et al.
patent: 4523556 (1985-06-01), Rogers
patent: 4780797 (1988-10-01), Libby et al.

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