Electrolytic solution for electrolytic capacitor
US9111685B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2011 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | Jan 3, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G9/035
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A hydrophobic film is formed on the electrode foil surface by adding a straight-chain saturated dicarboxylic acid represented by the general formula: HOOC(CH2)nCOOH (wherein n indicates an integer from 9 to 11) to the electrolytic solution for medium/high-voltage electrolytic capacitor. Addition of a large amount of water to the electrolytic solution is allowed since this hydrophobic film suppresses the hydration reaction between the electrode foil and water. Further, it is possible to retain good lifespan property of the electrolytic capacitor in a medium/high-voltage electrolytic solution by having low specific resistance property and by suppressing the hydration decomposition of the electrode foil, wherein the electrolytic solution is azelaic acid, sebacic acid, 1-methyl-azelaic acid, 1,6-decanedicarboxylic acid, or a salt thereof dissolved in a solvent having ethylene glycol as the main component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.