Solid electrolyte capacitors and methods of making the same
US4942501A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1988 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | Apr 28, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G9/022
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Compact leak-proof electrolytic capacitors including, between the anode and the cathode, an ultrathin layer of a solid electrolyte, are disclosed. The solid electrolyte comprises a solid solution of (a) an alkali metal salt, a transition metal salt or an ammonium salt of (b) a monobasic, dibasic or tribasic acid other than a haloid acid (c) in a polymer of high solvation power. Preferred salts are the tetrafluoroborates and hexafluoroglutarates of sodium and potassium, and the preferred polymer is a blend of polyethylene oxide with a siloxane-alkylene oxide copolymer. Methods of making such capacitors are also disclosed. Rolled solid electrolyte capacitors of this type are characterized by low volume, absence of electrolyte leakage, and minimum dielectric deformation, and are capable of delivering intense bursts of current on demand, thereby being suitable for use in biomedical electronic devices such as cardiac pacemakers and defibrillators implanted in the human body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.