US4559284A
Expired / Lapsed
US
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Secondary battery
Assignee: Hitachi Ltd
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Filing: 1984-10-11
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Granted: 1985-12-17
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Expires: 2004-10-11
Abstract
Abstract A secondary battery having at least one electrode made from a polymer having conjugated double bonds in a main chain such as polyacetylene can be improved remarkably in charge-discharge cycle life by making the electrode surface area of a negative electrode greater than that of a positive electrode.
Inventors
- 👤 Shigeoki Nishimura
- 👤 Kazunori Fujita
- 👤 Hiroyuki Sugimoto
- 👤 Atsuko Tohyama
- 👤 Noboru Ebato
- 👤 Shinpei Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:36
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M4/00; H01M4/02; H01M4/36; H01M4/60; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
In a secondary battery comprising a positive electrode, a negative electrode, and an electrolyte maintained between the electrodes, the electrodes each being made from a polymer having conjugated double bonds in a main chain, the negative electrode being doped with a cation from the electrolyte and the positive electrode being doped with an anion from the electrolyte, the improvement wherein the negative electrode has a larger electrode surface area than the positive electrode.
Claim 2
Dependent Claim
73 words
In a secondary battery comprising a positive electrode, a negative electrode, and an electrolyte maintained between the electrodes, the electrodes each being made from a polymer having conjugated double bonds in a main chain, the negative electrode being doped with a cation from the electrolyte and the positive electrode being doped with an anion from the electrolyte, the improvement wherein the negative electrode has a larger electrode surface area than the positive electrode.
Claim 3
Dependent Claim
15 words
A secondary battery according to claim 1, wherein the polymer is polyacetylene, polyparaphenylene or polyaniline.
Claim 4
Dependent Claim
29 words
A secondary battery according to claim 1, wherein the negative electrode has a larger electrode surface area than the positive electrode in terms of a geometric opposite surface area.
Claim 5
Dependent Claim
29 words
A secondary battery according to claim 1, wherein the negative electrode has a larger electrode surface area than the positive electrode in terms of a gross geometric surface area.
Claim 6
Dependent Claim
38 words
A secondary battery according to claim 1, wherein the negative electrode has a 3 to 20% larger electrode surface area than the positive electrode in terms of a geometric opposite surface area or a gross geometric surface area.
Claim 7
Dependent Claim
35 words
A secondary battery according to claim 1, wherein the negative electrode has a larger electrode surface area than the positive electrode in terms of a specific surface area per unit weight of electrode active material.
Claim 8
Dependent Claim
27 words
A secondary battery according to claim 6, wherein the specific surface area of the negative electrode is 30% or more larger than that of the positive electrode.
Claim 9
Dependent Claim
29 words
A secondary battery according to claim 1, wherein the negative electrode has a larger electrode surface area than the positive electrode in terms of a total specific surface area.
Claim 10
Dependent Claim
28 words
A secondary battery according to claim 8, wherein the total specific surface area of the negative electrode is 20% or less larger than that of the positive electrode.
References Cited (Backward Citations)
US4321114A
Cited
US4442187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |