Electric double layer capacitor and method for producing the same
US6487066B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 1, 1999 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Sep 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/13
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed is an electric double layer capacitor including polarizable electrodes immersed in an organic electrolyte, wherein a carbon material for forming the polarizable electrode is a carbon material including graphite-like microcrystalline carbon produced by effecting a heat treatment together with at least one of an alkali metal and an alkali metal compound at not less than a temperature at which alkali metal vapor is generated, and an electrostatic capacity is expressed by insertion of ions of a solute of the organic electrolyte into a space between microcrystalline carbon layers of the carbon material. Accordingly, it is possible to achieve an electrostatic capacity and a withstand voltage which exceed those of the conventional electric double layer capacitor based on the activated carbon system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.