Low temperature double-layer capacitors

Details Low temperature double-layer capacitors Low temperature double-layer capacitors

2008-06-05

2011-12-20

Ha, Nguyen T (Department: 2835)

Electricity: electrical systems and devices

Electrolytic systems or devices

Solid electrolytic capacitor

C361S517000, C361S519000, C361S525000, C361S528000, C361S529000

Reexamination Certificate

active

08081418

ABSTRACT:
Double-layer capacitors capable of operating at extremely low temperatures (e.g., as low as −75° C.) are disclosed. Electrolyte solutions combining a base solvent (e.g., acetonitrile) and a cosolvent are employed to lower the melting point of the base electrolyte. Example cosolvents include methyl formate, ethyl acetate, methyl acetate, propionitrile, butyronitrile, and 1,3-dioxolane. An optimized concentration (e.g., 0.10 M to 0.75 M) of salt, such as tetraethylammonium tetrafluoroborate, is dissolved into the electrolyte solution. In some cases (e.g., 1,3-dioxolane cosolvent) additives, such as 2% by volume triethylamine, may be included in the solvent mixture to prevent polymerization of the solution. Conventional device form factors and structural elements (e.g., porous carbon electrodes and a polyethylene separator) may be employed.

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