Pseudo-capacitor device for aqueous electrolytes

Details Pseudo-capacitor device for aqueous electrolytes Pseudo-capacitor device for aqueous electrolytes

1997-06-03

1998-11-24

Ledynh, Bot L.

Electricity: electrical systems and devices

Electrolytic systems or devices

Double layer electrolytic capacitor

361303, 361305, H01G 900

Patent

active

058416277

ABSTRACT:
A pseudo-capacitor having a high energy storage capacity develops a double layer capacitance as well as a Faradaic or battery-like redox reaction, also referred to as pseudo-capacitance. The Faradaic reaction gives rise to a capacitance much greater than that of the typical ruthenate oxide ultracapacitor which develops only charge separation-based double layer capacitance. The capacitor employs a lead and/or bismuth/ruthenate and/or where A=Pb, Bi, and B=Ru, Ir, and O<x.ltoreq.1 and O<y<0.5 and limits the amount of ruthenate and/or iridium in the electrodes while increasing the energy storage capacity. The ruthenate can be synthesized at low temperatures (40.degree.-80.degree. C.) to form a compound with a high surface area and high electronic conductivity which, in combination with the increased pseudo-capacitance, affords high energy/power density in the pseudo-capacitor. The amount of expensive ruthenate and iridium can be substantially reduced in the pseudo-capacitor by increasing the lead content while improving energy storage capacity.

REFERENCES:
patent: 4124530 (1978-11-01), Horowitz et al.
Article entitled Oxygen Electrocatalysis on Some Oxide Pyrochlores, by H.S. Horowitz et al., for Exxon Research and Engineering Company, Corporate Research Labrotories, Linden, New Jersey 07036, published in Journal of the Electrochemical Society: Electrochemical Science and Technology, vol. 130, Sep. 1983.

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