High voltage, highly conductive electrolyte for electrolytic capacitors
US6589441B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 2001 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Jul 11, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3956
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention is directed to a high voltage, highly conductive electrolyte for use in electrolytic capacitors and to an electrolytic capacitor impregnated with the electrolyte of the present invention for use in an implantable cardioverter defibrillator (ICD). The electrolyte according to the present invention is composed of a two solvent mixture of ethylene glycol and N-methylformamide; a combination of hypophosphorous acid, boric acid and an aliphatic dicarboxylic acid of carbon chain length from eight to twelve, such as azelaic, sebacic, or brassylic acid; an amine including ammonia, ammonium hydroxide, diethylamine, dimethylamine, triethylamine, or triethanolamine; and a nitro-substituted aromatic compound as a degassing agent, such as 3′-nitroacetophenone. Anhydrous ammonia may also be added to neutralize the solution. In an alternative embodiment of the electrolyte of the present invention, the ethylene glycol/NMF two solvent mixture can be substituted with 1,2-propanediol, using &ggr;-butyrolactone as a cosolvent with or without NMF. The electrolyte of the present invention will allow the construction of multi-anode capacitors with low equivalent series resista…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.