Proton exchange membrane electrochemical capacitors

Details Proton exchange membrane electrochemical capacitors Proton exchange membrane electrochemical capacitors

1991-02-11

1992-08-04

Griffin, Donald A.

Electricity: electrical systems and devices

Electrolytic systems or devices

Double layer electrolytic capacitor

29 2503, 252 622, H01G 900, B01J 1700

Patent

active

051364743

ABSTRACT:
Disclosed is a high-energy-density all-solid ionomer electrochemical capacitor, completely free of liquid electrolyte. The capacitor includes 1) a three-dimensional metal oxide-particulate-ionomer composite electrode structure, whereby the ionomer coats the individual particles and provides a mechanism for continuous proton transport throughout the composite structure and 2) a unitized repeating cell element that includes this three-dimensional composite electrode structure. The composite electrode structures are bonded to opposite sides of a thin sheet of a solid proton-conducting ionomer membrane and form an integrally bonded membrane and electrode assembly (MEA). The composite electrodes of the MEA are pressed against thin electrically conductive current collectors to form a repeating element in a bipolar cell capacitor arrangement. Energy storage and discharge are achieved by utilizing double-layer and reversible redox processes. High-energy-density is achieved by utilizing select high-surface-area conductive metal oxide powders wherein the individual particles are in intimate contact with a film of a highly ionically conducting solid polymer ionomer.

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