Process for producing an impermeable or substantially...

Details Process for producing an impermeable or substantially... Process for producing an impermeable or substantially...

1999-07-20

2002-08-06

Talbot, Brian K. (Department: 1762)

Coating processes

Electrical product produced

Condenser or capacitor

C427S122000, C427S379000, C427S437000, C427S443100, C029S623500, C029S885000

Reexamination Certificate

active

06428842

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a process for producing an impermeable or substantially impermeable electrode, for example, electrolytic capacitors, supercapacitors or batteries.
It is known in the field of electrolytic capacitors to use metal foils as cathodes. Therein the metal foils are etched chemically or electrochemically. The etching penetrates into the material body of the metal foil whereby the surface and, thus, the specific capacitance, of the. foil is increased. Due to the etching, the electric resistance, for example of an aluminum foil, in comparison to a non-etched foil, is increased by a factor which is a function of the quantity of the metal removed during the. etching process. In addition, the metal foil loses mechanical strength. The natural oxidation which takes place with this treatment yields a capacitance which is a function of the dielectric constant of the metal itself and the treatment performed on the metal foil.
SUMMARY OF THE INVENTION
In contrast, according to the present invention the desired capacitance is attained through the deposition of graphite. In this way neither the electric resistance nor the mechanical strength of the metal foil are impaired.


REFERENCES:
patent: 5158843 (1992-10-01), Batson et al.
patent: 5723232 (1998-03-01), Yamada et al.
patent: 0470563 (1992-02-01), None
patent: 2080678 (1997-05-01), None
Database WPI, Section Ch, Week 199806, Derwent Publications Ltd., London, GB; Class L03, AN 1998-061786, XP002119143 & RU 2 080 678 C (Voron Radio Parts Wks Stock Co), May 27, 1997.

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