Proton exchange membrane electrochemical capacitors
US5136474A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1991 |
| Grant date | Aug 4, 1992 |
| Priority date | — |
| Expiry date | Feb 11, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/13
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.