Depolarizers for hybrid capacitors

Details Depolarizers for hybrid capacitors Depolarizers for hybrid capacitors

H - Electricity

01

G

H01G 9/035 (2006.01) H01G 9/02 (2006.01)

Patent

CA 2411765

The present invention is directed to a water based electrolyte used in a hybrid-type capacitor. The hybrid-type capacitor has an electrolytic anode and an electrochemical cathode. The difference resides in the electrolyte for this type of capacitor. The electrolyte has water, a water soluble inorganic and/or organic acid and/or salt, and a water soluble nitro-aromatic compound. Such a hybrid capacitor (1) improves energy density by significantly reducing volume of the separator and cathod material often used in conventional electrolytic capacitors and (2) has an electrochemical cathode that undergoes an electrochemical reduction without generating gassing. For example, ruthenium oxide, RuO2, is reduced to ruthenium hydroxide, Ru(OH)2, when passing a cathodic current. However, the present invention discovered that without the present electrolyte, the RuO2 cathode does generate gassing if it is sufficiently depleted. The gassing degrades capacitor performance and even casuse failure, which is decreased with the present electrolyte solution.

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