Coated cathode for rechargeable metal battery
US5432022A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1993 |
| Grant date | Jul 11, 1995 |
| Priority date | — |
| Expiry date | Nov 12, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved cathode is described which comprises an air-permeable, top coat deposited on the face of the cathode current collector screen. The top coat contains a CO.sub.2 absorber such as magnesium hydroxide which absorbs CO.sub.2 from the air and prevents CO.sub.2 from reacting with or neutralizing the electrolyte. The layer is composed of a dispersion of metal hydroxide in a hydrophobic binder such as polytetrafluoroethylene. The top coat is preferably formed of a first, outer gas flow limiting layer of hydrophobic material absent any CO.sub.2 absorber and a second, inner layer adjacent the current collector of hydrophobic binder containing a CO.sub.2 absorber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.