US6206937B1
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Solid electrolytic capacitors comprising a conductive layer made of a polymer of pyrrole or its derivative and method for making the same
Assignee: Panasonic Holdings Corp
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Filing: 1998-09-04
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Granted: 2001-03-27
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Expires: 2018-09-04
Abstract
Abstract A solid electrolytic capacitor comprising comprises a pair of electrodes, and a dielectric film provided between the paired electrodes wherein at least one of the paired electrodes comprising a first conductive polymer layer which is made of a polymer of a member selected from the group consisting of pyrrole and derivatives thereof, the first conductive polymer layer being doped with a mixed dopant of a polyvalent anion and a monovalent anion consisting of a sulfonate ion dissociated from an anionic surface active agent. The conductive polymer layer may have a double-layered or a multi-layered structure wherein a second and/or third conductive polymer layer is made of a doped polymer of a thiophene derivative. A method for making the capacitors are also described.
Inventors
- 👤 Yasuo Kudoh
- 👤 Kenji Akami
- 👤 Toshikuni Kojima
- 👤 Yasue Matsuya
- 👤 Hiroshi Shimada
- 👤 Chiharu Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:21
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G9/025; H01G11/00; H01G11/22; H01G11/30; H01G11/48; H01G11/54; H01G11/56; H01G9/0029; H01G9/0036; H01G9/028; H01G9/04; H01G9/042; H01G9/0425; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
95 words
A method for making a solid electrolytic capacitor, which comprises providing an electrode, forming a dielectric film on said electrode, and forming a counter electrode on said dielectric film, wherein said counter electrode comprises a first conductive polymer layer which is formed by chemical polymerization, and is made of a polymer of pyrrole or its derivative doped with a mixed dopant comprising both a polyvalent anion and a monovalent anion comprising a sulfonate anion dissociated from an anionic surface active agent, wherein the mole ratio of polyvalent anion to monovalent anion is 1:9 to 1:999.
Claim 2
Independent Claim
95 words
A method for making a solid electrolytic capacitor, which comprises providing an electrode, forming a dielectric film on said electrode, and forming a counter electrode on said dielectric film, wherein said counter electrode comprises a first conductive polymer layer which is formed by chemical polymerization, and is made of a polymer of pyrrole or its derivative doped with a mixed dopant comprising both a polyvalent anion and a monovalent anion comprising a sulfonate anion dissociated from an anionic surface active agent, wherein the mole ratio of polyvalent anion to monovalent anion is 1:9 to 1:999.
Claim 3
Dependent Claim
71 words
A method according to claim 1 , wherein the chemical polymerization comprises immersing the dielectric film-bearing electrode in a monomer solution comprising pyrrole or its derivative and the anionic surface active agent, further immersing the thus immersed electrode in an oxidant solution comprising the polyvalent anion, and repeating the above steps until the resultant conductive polymer of pyrrole or its derivative is formed on said dielectric film in a given thickness.
Claim 4
Dependent Claim
20 words
A method according to claim 2 , wherein said monomer solution comprises a liquid medium comprising water and an alcohol.
Claim 5
Dependent Claim
30 words
A method according to claim 3 , wherein said alcohol is a member selected from the group consisting of methanol, ethanol, propanol, ethylene glycol, propylene glycol, glycerin and mixtures thereof.
Claim 6
Dependent Claim
16 words
A method according to claim 2 , wherein said monomer solution further comprises a phenolic compound.
Claim 7
Dependent Claim
30 words
A method according to claim 5 , wherein said phenolic compound is a member selected from the group consisting of phenol, nitrophenol, cyanophenol, hydroxybenzoic acid, hydroxyphenol, acetophenol and mixtures thereof.
Claim 8
Dependent Claim
56 words
A method according to claim 1 , wherein the chemical polymerization comprises immersing the dielectric film-bearing electrode in a polymerization system comprising pyrrole or its derivative, the anionic surface active agent and an oxidant capable of yielding the polyvalent anion until the resultant conductive polymer of pyrrole or its derivative is formed in a given thickness.
Claim 9
Dependent Claim
20 words
A method according to claim 7 , wherein said polymerization system comprises a liquid medium comprising water and an alcohol.
Claim 10
Dependent Claim
30 words
A method according to claim 8 , wherein said alcohol is a member selected from the group consisting of methanol, ethanol, propanol, ethylene glycol, propylene glycol, glycerin and mixtures thereof.
Claim 11
Dependent Claim
16 words
A method according to claim 7 , wherein said polymerization system farther comprises a phenolic compound.
Claim 12
Dependent Claim
30 words
A method according to claim 10 , wherein said phenolic compound is a member selected from the group consisting of phenol, nitrophenol, cyanophenol, hydroxybenzoic acid, hydroxyphenol, acetophenol and mixtures thereof.
Claim 13
Dependent Claim
28 words
A method according to claim 1 , wherein said electrode is made of a valve metal and said dielectric film is formed by anodization of said valve metal.
Claim 14
Dependent Claim
23 words
A method according to claim 12 , wherein said valve metal is a member selected from the group consisting of aluminum and tantalum.
Claim 15
Dependent Claim
17 words
A method according to claim 1 , wherein said dielectric film consists of a polymer thin film.
Claim 16
Dependent Claim
23 words
A method according to claim 14 , wherein said polymer thin film is formed by spin coating of a solution of a polymer.
Claim 17
Dependent Claim
15 words
A method according to claim 15 , wherein said polymer is made of a polyimide.
Claim 18
Dependent Claim
21 words
A method according to claim 1 , further comprising forming a manganese dioxide layer after the formation of said dielectric film.
Claim 19
Dependent Claim
21 words
A method according to claim 17 , wherein said manganese dioxide layer is formed by thermal decomposition of a manganese salt.
Claim 20
Dependent Claim
19 words
A method according to claim 17 , wherein said manganese dioxide layer is formed by reduction of a permanganate.
Claim 21
Dependent Claim
54 words
A method according to claim 1 , further comprising forming, prior to the formation of said first conductive polymer layer, a second conductive polymer layer on said dielectric film, said second conductive polymer layer comprising a polymer of a thiophene derivative of the following formula wherein A represents an unsubstituted or substituted alkylene group.
Claim 22
Dependent Claim
18 words
A method according to claim 20 , wherein said second conductive polymer layer is formed by chemical polymerization.
Claim 23
Dependent Claim
58 words
A method according to claim 21 , wherein the chemical polymerization comprises immersing the dielectric film-bearing electrode in a monomer solution comprising the thiophene derivative and an anionic surface active agent, and further immersing the thus immersed electrode in an oxidant solution comprising a sulfate thereby forming a conductive polymer of the thiophene derivative on said dielectric film.
Claim 24
Dependent Claim
14 words
A method according to claim 22 , wherein said sulfate consists of ferric sulfate.
Claim 25
Dependent Claim
17 words
A method according to claim 22 , wherein said anionic surface active agent comprising a sulfonate anion.
Claim 26
Dependent Claim
16 words
A method according to claim 22 , wherein said monomer solution further comprises a phenolic compound.
Claim 27
Dependent Claim
30 words
A method according to claim 25 , wherein said phenolic compound is a member selected from the group consisting of phenol, nitrophenol, cyanophenol, hydroxybenzoic acid, hydroxyphenol, acetophenol and mixtures thereof.
Claim 28
Dependent Claim
61 words
A method according to claim 21 , wherein the chemical polymerization comprises immersing the dielectric film-bearing electrode in a polymerization system comprising the thiophene derivative, an anionic surface active agent capable of yielding a monovalent anion, and an oxidant capable of yielding the polyvalent anion until the resultant conductive polymer of pyrrole or its derivative is formed in a given thickness.
Claim 29
Dependent Claim
31 words
A method according to claim 20 , wherein said second conductive polymer layer is formed by immersing the dielectric film in a solution of a conductive polymer of the thiophene derivative.
Claim 30
Dependent Claim
62 words
A method according to claim 20 , further comprising forming a third conductive polymer layer on said first conductive polymer layer on a side opposite to the side where said second conductive polymer layer has been formed, said third conductive polymer layer comprising a polymer of a thiophene derivative of the following formula wherein A represents an unsubstituted or substituted alkylene group.
Claim 31
Dependent Claim
18 words
A method according to claim 29 , wherein said third conductive polymer layer is formed by chemical polymerization.
Claim 32
Dependent Claim
25 words
A method according to claim 29 , wherein said third conductive polymer layer is formed by immersing the dielectric film in a conductive polymer solution.
Claim 33
Dependent Claim
18 words
A method according to claim 1 , wherein said first conductive polymer layer is formed by electrolytic polymerization.
Claim 34
Dependent Claim
17 words
A method according to claim 32 , wherein said electrolytic polymerization is conducted in an aqueous medium.
Claim 35
Dependent Claim
26 words
A method according to claim 33 , wherein said electrolytic polymerization is conducted in an aqueous solution of pyrrole or its derivative comprising a phenolic compound.
Claim 36
Dependent Claim
30 words
A method according to claim 34 , wherein said phenolic compound is a member selected from the group consisting of phenol, nitrophenol, cyanophenol, hydroxybenzoic acid, hydroxyphenol, acetophenol and mixtures thereof.
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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) | 2004-03-26 | 2004-09-25 | 2005-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-03-26 | 2008-09-25 | 2009-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-03-26 | 2012-09-25 | 2013-03-27 | $7700.00 | Window Closed / Lapsed |