US5518841A
Expired / Lapsed
US
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Composite cathode
Assignee: Panasonic Holdings Corp
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Filing: 1994-02-03
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Granted: 1996-05-21
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Expires: 2014-02-03
Abstract
Abstract A composite cathode for a battery is disclosed. In addition, a method is disclosed for producing said composite cathode which can be configured in a battery. The method comprises steps or (1) preparing a solution or an organic disulfide compound in 2-pyrrolidone or its derivative, (2) adding polyaniline to the solution to dissolve, thereby obtaining a homogeneous liquid, and then (3) removing at least a part of the 2-pyrrolidone or its derivative from the homogeneous liquid to obtain a solid product wherein the organic disulfide compound and the polyaniline are homogeneously mixed.
Inventors
- 👤 Tadashi Sotomura
- 👤 Hiroshi Uemachi
- 👤 Yoshiko Miyamoto
- 👤 Kenichi Takeyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:20
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/362; H01M4/364; H01M4/60; H01M10/00; H01M10/34; H01M10/345; H01M2004/026; H01M2004/028; H01M2300/00; H01M2300/0017; H01M2300/0025; H01M4/48; H01M4/485; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49115
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
74 words
A composite electrode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized, N-alkyl-2-pyrrolidone or 2-pyrrolidone represented by the formula: ##STR2## where R represents a hydrogen atom or an alkyl group, and polyaniline.
Claim 2
Dependent Claim
74 words
A composite electrode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized, N-alkyl-2-pyrrolidone or 2-pyrrolidone represented by the formula: ##STR2## where R represents a hydrogen atom or an alkyl group, and polyaniline.
Claim 3
Dependent Claim
67 words
The composite electrode according to claim 1, wherein said organic disulfide compound is at least one selected from the group consisting of dithioglycol (HSCH 2 CH 2 SH), 2,5-dimercapto-1,3,4-thiadiazole (C 2 N 2 S(SH) 2 ), s-triazine-2,4,6-trithiol (C 3 H 3 N 3 S 3 ), 7-methyl-2,6,8-trimercaptopurine (C 6 H 6 N 4 S 3 ), and 4,5-diamino-2,6-dimercaptopyrimidine (C 4 H 6 N 4 S 2 ).
Claim 4
Dependent Claim
78 words
A composite electrode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized, N-alkyl-2-pyrrolidone or 2-pyrrolidone represented by the formula: ##STR3## where R represents a hydrogen atom or an alkyl group, polyaniline, and a metal oxide powder.
Claim 5
Dependent Claim
78 words
A composite electrode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized, N-alkyl-2-pyrrolidone or 2-pyrrolidone represented by the formula: ##STR3## where R represents a hydrogen atom or an alkyl group, polyaniline, and a metal oxide powder.
Claim 6
Dependent Claim
20 words
The composite electrode according to claim 1 or 3, wherein said polyaniline is a polyaniline of de-doped and reduced state.
Claim 7
Dependent Claim
46 words
The composite electrode according to claim 4, wherein said metal oxide is at least one of transition metal oxide selected from the group consisting of LiCoO 2 , V 6 O 13 , LiMn 2 O 4 , V 2 O 5 and LiNiO 2 .
Claim 8
Dependent Claim
72 words
A composite electrode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized, polyaniline, and a metal oxide powder which is homogeneously mixed with said organic disulfide compound and said polyaniline.
Claim 9
Dependent Claim
72 words
A composite electrode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized, polyaniline, and a metal oxide powder which is homogeneously mixed with said organic disulfide compound and said polyaniline.
Claim 10
Dependent Claim
18 words
The composite electrode according to claim 6, wherein said polyaniline is a polyaniline of de-doped and reduced state.
Claim 11
Dependent Claim
46 words
The composite electrode according to claim 6, wherein said metal oxide is at least one of transition metal oxide selected from the group consisting of LiCoO 2 , V 6 O 13 , LiMn 2 O 4 , V 2 O 5 and LiNiO 2 .
Claim 12
Dependent Claim
95 words
A lithium secondary battery comprising: an electrolyte; an anode; and a composite cathode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized; polyaniline, wherein said organic disulfide compound and said polyaniline are homogeneously mixed; and N-alkyl-2-pyrrolidone or 2-polyrrolidone represented by the formula: ##STR4## where R represents a hydrogen atom or an alkyl atom.
Claim 13
Dependent Claim
95 words
A lithium secondary battery comprising: an electrolyte; an anode; and a composite cathode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized; polyaniline, wherein said organic disulfide compound and said polyaniline are homogeneously mixed; and N-alkyl-2-pyrrolidone or 2-polyrrolidone represented by the formula: ##STR4## where R represents a hydrogen atom or an alkyl atom.
Claim 14
Dependent Claim
89 words
The lithium secondary battery comprising a cathode, an electrolyte and an anode, wherein the cathode is a composite electrode, which comprises: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized; polyaniline; and a metal oxide powder which is homogeneously mixed with said organic disulfide compound and said polyaniline.
Claim 15
Dependent Claim
89 words
The lithium secondary battery comprising a cathode, an electrolyte and an anode, wherein the cathode is a composite electrode, which comprises: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized; polyaniline; and a metal oxide powder which is homogeneously mixed with said organic disulfide compound and said polyaniline.
Claim 16
Dependent Claim
46 words
The composite electrode according to claim 10, wherein said metal oxide is at least one of transition metal oxide selected from the group consisting of LiCoO 2 , V 6 O 13 , LiMn 2 O 4 , V 2 O 5 and LiNiO 2 .
Claim 17
Dependent Claim
101 words
A composite electrode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized, and polyaniline which is homogeneously mixed with said organic disulfide compound, said polyaniline and said organic disulfide being homogeneously mixed by the process comprising the steps of: dissolving said organic disulfide compound and said polyaniline in a solvent; and removing said solvent to obtain said homogenous mixture.
Claim 18
Dependent Claim
101 words
A composite electrode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized, and polyaniline which is homogeneously mixed with said organic disulfide compound, said polyaniline and said organic disulfide being homogeneously mixed by the process comprising the steps of: dissolving said organic disulfide compound and said polyaniline in a solvent; and removing said solvent to obtain said homogenous mixture.
Claim 19
Dependent Claim
117 words
A lithium secondary battery comprising a cathode, an electrolyte, and an anode, wherein said cathode is a composite electrode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized, and polyaniline which is homogeneously mixed with said organic disulfide compound, said polyaniline and said organic disulfide being homogeneously mixed by the process comprising the steps of: dissolving said organic disulfide compound and said polyaniline in a solvent; and removing said solvent to obtain said homogenous mixture.
Claim 20
Dependent Claim
117 words
A lithium secondary battery comprising a cathode, an electrolyte, and an anode, wherein said cathode is a composite electrode comprising: an organic disulfide compound which contains at least one sulfur-sulfur bond or at least two thiolate or thiol groups, wherein said sulfur-sulfur bond is cleaved when electrolytically reduced to form thiolate groups or thiol groups and said sulfur-sulfur bond is regenerated when said thiolate or thiol groups are electrolytically oxidized, and polyaniline which is homogeneously mixed with said organic disulfide compound, said polyaniline and said organic disulfide being homogeneously mixed by the process comprising the steps of: dissolving said organic disulfide compound and said polyaniline in a solvent; and removing said solvent to obtain said homogenous mixture.
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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) | 1999-05-21 | 1999-11-20 | 2000-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-21 | 2003-11-20 | 2004-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-21 | 2007-11-20 | 2008-05-21 | $7700.00 | Window Closed / Lapsed |