High capacitance anode and system and method for making same

Details High capacitance anode and system and method for making same High capacitance anode and system and method for making same

2005-02-22

2005-02-22

Nicolas, Wesley A. (Department: 1742)

Electrolysis: processes, compositions used therein, and methods

Electrolytic erosion of a workpiece for shape or surface...

Electrolyte composition or defined electrolyte

C205S640000, C205S675000, C205S684000, C205S682000, C205S324000, C205S325000, C205S326000, C205S328000, C205S329000

Reexamination Certificate

active

06858126

ABSTRACT:
A method of producing electrodes for electrolytic capacitors by etching metal foil in a low pH etching electrolyte is disclosed. The low pH electrolyte is an aqueous solution, which comprises hydrochloric acid, glycerol, sodium perchlorate or perchloric acid, sodium persulfate and titanium (111) chloride. Anode foils etched according to the method of the invention maintain high capacitance gains, electrical porosity and strength. The electrical porosity of the etched foils is sufficiently high such that the overall Equivalent Series Resistance (ESR) is not increased in multilayer anodes configurations. Also described is a low pH electrolyte bath composition. Anode foils etched according to the present invention and electrolytic capacitors incorporating the etched anode foils are also disclosed.

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