Separator for polymer electrolyte fuel cells and processes for production thereof
US6242124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1999 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Aug 16, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49108
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides: PA1 a separator for a polymer electrolyte fuel cell, interposed between the gas diffusion electrodes of the fuel cell and having, in at least one side, a groove for supply of an oxidizing agent or a fuel gas, which separator is made of a carbon composite material comprising (a) 100 parts by weight of an expanded graphite powder and (b) 10-45 parts by weight of a thermosetting resin dispersed in the expanded graphite powder (a), wherein the expanded graphite powder has an average particle diameter of 5-12 .mu.m and at least 80% of the total particles of the expanded graphite powder have particle diameters of 0.1-20 .mu.m. The separator for polymer electrolyte fuel cells according to the present invention is lightweight, can be grooved precisely and easily, and has a high gas barrier property, strength and electroconductivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.