US4725926A
Expired / Lapsed
US
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Electric double layer capacitor having high capacity
Assignee: Elna Co Ltd
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Filing: 1987-01-15
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Granted: 1988-02-16
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Expires: 2007-01-15
Abstract
Abstract An electric double layer capacitor utilizing an electric double layer formed by the interface of an electrolyte solution and polarizable electrodes, wherein the electrolyte solution comprises a quaternary phosphonium salt of the formula I dissolved in an organic solvent: ##STR1## wherein each of R 1 , R 2 , R 3 and R 4 is a hydrogen atom, an alkyl group having from 1 to 15 carbon atoms or an aryl group having from 6 to 15 carbon atoms, provided that not all of R 1 to R 4 are hydrogen atoms, and X is BF 4 , PF 6 , ClO 4 , AsF 6 , SbF 6 , AlCl 4 or R f SO 3 wherein R f is a fluoroalkyl group having from 1 to 8 carbon atoms.
Inventors
- 👤 Takeshi Morimoto
- 👤 Kazuya Hiratsuka
- 👤 Yasuhiro Sanada
- 👤 Hiroshi Ariga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:21
CPC Classifications
H; H01; H01G; H01G11/00; H01G11/54; H01G11/58; H01G11/60; H01G11/62; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
131 words
An electric double layer capacitor utilizing an electric double layer formed by the interface of an electrolyte solution and polarizable electrodes, wherein the electrolyte solution comprises a quaternary phosphonium salt of the formula I dissolved in an organic solvent: ##STR3## wherein each of R 1 , R 2 , R 3 and R 4 is a hydrogen atom, an alkyl group having from 1 to 15 carbon atoms or an aryl group having from 6 to 15 carbon atoms, provided that not all of R 1 to R 4 are hydrogen atoms, and X is BF 4 , PF 6 , ClO 4 , AsF 6 , SbF 6 , AlCl 4 or R f SO 3 wherein R f is a fluoroalkyl group having from 1 to 8 carbon atoms.
Claim 2
Dependent Claim
131 words
An electric double layer capacitor utilizing an electric double layer formed by the interface of an electrolyte solution and polarizable electrodes, wherein the electrolyte solution comprises a quaternary phosphonium salt of the formula I dissolved in an organic solvent: ##STR3## wherein each of R 1 , R 2 , R 3 and R 4 is a hydrogen atom, an alkyl group having from 1 to 15 carbon atoms or an aryl group having from 6 to 15 carbon atoms, provided that not all of R 1 to R 4 are hydrogen atoms, and X is BF 4 , PF 6 , ClO 4 , AsF 6 , SbF 6 , AlCl 4 or R f SO 3 wherein R f is a fluoroalkyl group having from 1 to 8 carbon atoms.
Claim 3
Dependent Claim
33 words
The capacitor according to claim 1, wherein the quaternary phosphonium salt is of an asymmetrical type wherein at least two different kinds of alkyl or aryl groups are bonded to the phosphorus atom.
Claim 4
Dependent Claim
31 words
The capacitor according to claim 1, wherein the quaternary phosphonium salt is of a symmetrical type wherein the same kind of alkyl or aryl groups are bonded to the phosphorus atom.
Claim 5
Dependent Claim
22 words
The capacitor according to claim 1, wherein the alkyl group is a lower alkyl group having from 1 to 4 carbon atoms.
Claim 6
Dependent Claim
16 words
The capacitor according to claim 1, wherein the aryl group contains one or two benzene rings.
Claim 7
Dependent Claim
20 words
The capacitor according to claim 1, wherein X is R f SO 3 , ClO 4 or BF 4 .
Claim 8
Dependent Claim
19 words
The capacitor according to claim 1, wherein the organic solvent is propylene carbonate, γ-butyrolactone, sulfolane or a mixture thereof.
Claim 9
Dependent Claim
20 words
The capacitor according to claim 1, wherein the solute concentration in the electrolyte solution is from 0.1 to 3 M.
Claim 10
Dependent Claim
116 words
An electrolyte solution for an electric double layer capacitor which comprises a quaternary phosphonium salt of the formula I dissolved in an organic solvent: ##STR4## wherein each of R 1 , R 2 , R 3 and R 4 is a hydrogen atom, an alkyl group having from 1 to 15 carbon atoms or an aryl group having from 6 to 15 carbon atoms, provided that not all of R 1 to R 4 are hydrogen atoms, and X is BF 4 , PF 6 , ClO 4 , AsF 6 , SbF 6 , AlCl 4 or R f SO 3 wherein R f is a fluoroalkyl group having from 1 to 8 carbon atoms.
Claim 11
Dependent Claim
116 words
An electrolyte solution for an electric double layer capacitor which comprises a quaternary phosphonium salt of the formula I dissolved in an organic solvent: ##STR4## wherein each of R 1 , R 2 , R 3 and R 4 is a hydrogen atom, an alkyl group having from 1 to 15 carbon atoms or an aryl group having from 6 to 15 carbon atoms, provided that not all of R 1 to R 4 are hydrogen atoms, and X is BF 4 , PF 6 , ClO 4 , AsF 6 , SbF 6 , AlCl 4 or R f SO 3 wherein R f is a fluoroalkyl group having from 1 to 8 carbon atoms.
References Cited (Backward Citations)
US3223639A
Cited
US4260668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |