US5424907A
Expired / Lapsed
US
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Solid electrolytic capacitors and method for manufacturing the same
Assignee: Panasonic Holdings Corp
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Filing: 1993-02-17
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Granted: 1995-06-13
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Expires: 2013-02-17
Abstract
Abstract Solid electrolytic capacitors comprise a valve metal member having a dielectric film, with or without a conductive underlying layer, formed on the member, and a conductive polymer film formed on the layer. The conductive polymer film is formed by electrolytic polymerization of a polymerizable monomer contained in a system which comprises the monomer, a support electrolyte, and at least one member selected from silicic acids and silicates with or without phenol compounds. By this, the life of the capacitor even under high temperature and high humidity conditions is significantly improved. Methods for fabricating such capacitors are also described.
Inventors
- 👤 Toshikuni Kojima
- 👤 Masao Fukuyama
- 👤 Yasuo Kudoh
- 👤 Koichi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:26
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G9/025; H01G11/00; H01G11/54; H01G11/56; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
62 words
A solid electrolytic capacitor which comprises a valve metal member having a dielectric film formed thereon, and a conductive polymer film which is formed on the dielectric film and consists of an electrolytically polymerized product of a electrolytic mixture which comprises at least one compound selected from the group consisting of silicic acids and silicates, an polymerizable monomer and a support electrolyte.
Claim 2
Dependent Claim
62 words
A solid electrolytic capacitor which comprises a valve metal member having a dielectric film formed thereon, and a conductive polymer film which is formed on the dielectric film and consists of an electrolytically polymerized product of a electrolytic mixture which comprises at least one compound selected from the group consisting of silicic acids and silicates, an polymerizable monomer and a support electrolyte.
Claim 3
Dependent Claim
17 words
The solid electrolytic capacitor according to claim 1, wherein said at least one compound is a silicate.
Claim 4
Dependent Claim
14 words
The solid electrolytic capacitor according to claim 2, wherein said silicate is sodium silicate.
Claim 5
Dependent Claim
15 words
The solid electrolytic capacitor according to claim 1, wherein said valve metal member is aluminum.
Claim 6
Dependent Claim
15 words
The solid electrolytic capacitor according to claim 1, wherein said valve metal member is tantalum.
Claim 7
Dependent Claim
24 words
The solid electrolytic capacitor according to claim 1, wherein a conductive underlying layer is provided between said dielectric film and said conductive polymer film.
Claim 8
Dependent Claim
17 words
The solid electrolytic capacitor according to claim 6, wherein said conductive underlying layer consists of manganese oxide.
Claim 9
Dependent Claim
31 words
The solid electrolytic capacitor according to claim 1, wherein tile polymerizable monomer is a member selected from the group consisting of pyrrole, thiophene, derivatives of pyrrole and thiophene and mixtures thereof.
Claim 10
Dependent Claim
16 words
The solid electrolytic capacitor according to claim 1, further comprising a phenol compound in said mixture.
Claim 11
Dependent Claim
14 words
The solid electrolytic capacitor according to claim 9, wherein said phenol compound is nitrophenol.
Claim 12
Dependent Claim
26 words
The solid electrolytic capacitor according to claim 1, wherein said support electrolyte is a naphthalenesulfonate having an alkyl substituent having from 1 to 12 carbon atoms.
Claim 13
Dependent Claim
23 words
The solid electrolytic capacitor according to claim 1, wherein said support electrolyte is an alkyl phosphate having from 2 to 12 carbon atoms.
Claim 14
Independent Claim
73 words
A method for fabricating a solid electrolytic capacitor which comprises: providing a valve metal member having a dielectric film formed thereon; and subjecting the valve metal member to electrolytic polymerization of a polymerizable monomer in an electrolytic polymerization system which comprises, in a liquid medium, the polymerizable monomer, at least one compound selected from silicic acids and silicates, and a support electrolyte, thereby forming a conductive polymer film on the valve metal member.
Claim 15
Independent Claim
73 words
A method for fabricating a solid electrolytic capacitor which comprises: providing a valve metal member having a dielectric film formed thereon; and subjecting the valve metal member to electrolytic polymerization of a polymerizable monomer in an electrolytic polymerization system which comprises, in a liquid medium, the polymerizable monomer, at least one compound selected from silicic acids and silicates, and a support electrolyte, thereby forming a conductive polymer film on the valve metal member.
Claim 16
Dependent Claim
12 words
The method according to claim 13, wherein the liquid medium is water.
Claim 17
Dependent Claim
39 words
The method according to claim 13, wherein said electrolytic polymerization system comprises 0.01 to 1 mole/liter of the monomer, 0.01 to 0.5 moles/liter of support electrolyte, and not less than 1×10 -4 mole/liter of said at least one compound.
Claim 18
Dependent Claim
24 words
The method according to claim 15, wherein said at least one compound is present in an amount of not less than 1×10 -3 mole/liter.
Claim 19
Dependent Claim
28 words
The method according to claim 13, wherein said monomer is a member selected from the group consisting of pyrrole, thiophene, derivatives of pyrrole and thiophene and mixtures thereof.
Claim 20
Dependent Claim
25 words
The method according to claim 13, wherein said support electrolyte consists of a naphthalenesulfonate having an alkyl substituent having from 1 to 12 carbon atoms.
Claim 21
Dependent Claim
22 words
The method according to claim 13, wherein said support electrolyte consists of an alkyl phosphate having from 2 to 12 carbon atoms.
Claim 22
Dependent Claim
25 words
The method according to claim 13, wherein said electrolytic polymerization system further comprises a phenol compound in an amount of from 0.005 to 0.5 moles/liter.
Claim 23
Dependent Claim
12 words
The method according to claim 20, wherein said phenol compound is nitrophenol.
Claim 24
Dependent Claim
22 words
The method according to claim 13, further comprising providing a conductive underlying layer between said dielectric film and said conductive polymer film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-12 | 1998-12-12 | 1999-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-12 | 2002-12-12 | 2003-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-12 | 2006-12-12 | 2007-06-13 | $7700.00 | Window Closed / Lapsed |