Carbonaceous material, polarizable electrode for electrical double-layer capacitor, and electrical double-layer capacitor
US6574092B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 16, 2001 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Oct 16, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/13
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A carbonaceous material having a pore size distribution, as determined from a nitrogen adsorption isotherm, in which pores with a radius of up to 10 å account for at most 70% of the total pore volume, and having a specific surface area, as measured by the nitrogen adsorption BET method, of 1-500 m2/g is optimized for the penetration of non-aqueous electrolyte solution to the interior thereof and the surface adsorption of ionic molecules so as to form an electrical double layer thereon. Electrical double-layer capacitors assembled using polarizable electrodes made with the carbonaceous material have a high voltage, a high energy density, a high capacitance, a long cycle life, and are amenable to miniaturization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.