US4496637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode for flowcell
Assignee: Toyobo Co Ltd
•
Filing: 1983-12-22
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Granted: 1985-01-29
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Expires: 2003-12-22
Abstract
Abstract An electrode for an flowcell comprising electrode material made of carbon fiber having average <002> spacing of quasi-graphite crystalline structure of not more than 3.70 Å, and the average C-axis size of crystallite of not less than 9.0 Å and at least 3 % by mole of oxygen atom bound to the fiber surface based on carbon atom, whereby the electrode has remarkable high electrical conductivity, current efficiency handling characteristics and hydrodynamic characteristics, and is adapted to flowcell.
Inventors
- 👤 Masayoshi Shimada
- 👤 Yasuhiro Iizuka
- 👤 Tetuo Hukazu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:44
CPC Classifications
C; C25; C25B; C25B11/00; B; B60; B60L; B60L50/00; B60L50/50; B60L50/60; B60L50/64; B60L58/00; B60L58/10; B60L58/18; B60L58/20; D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/122; D01F11/16; H; H01; H01M; H01M10/00; H01M10/36; H01M4/00; H01M4/86; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50; Y02T; Y02T10/00; Y02T10/60; Y02T10/70
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
58 words
An electrode for a flowcell which comprises an electrode material made of carbon fiber having <002> spacing of quasi-graphite crystalline structure of not more than 3.70 Å, and an average C-axis size of crystallite of not less than 9.0 Å and at least 3% by mole of oxygen atom bound to the fiber surface based on carbon atom.
Claim 2
Dependent Claim
58 words
An electrode for a flowcell which comprises an electrode material made of carbon fiber having <002> spacing of quasi-graphite crystalline structure of not more than 3.70 Å, and an average C-axis size of crystallite of not less than 9.0 Å and at least 3% by mole of oxygen atom bound to the fiber surface based on carbon atom.
Claim 3
Dependent Claim
14 words
The electrode according to claim 1, wherein the carbon fiber constitutes a knitted fabric.
Claim 4
Dependent Claim
32 words
The electrode according to claim 2, wherein the knitted fabric has an observed density of less than 0.35 g/cm 3 and longitudinal and vertical elongation at break of not less than 5%.
Claim 5
Dependent Claim
16 words
The electrode according to claim 1, which is applied to a redox flow type secondary battery.
Claim 6
Dependent Claim
21 words
The electrode according to claim 1, wherein the active material for the positive pole of the electrode produces Fe 3+ .
Claim 7
Dependent Claim
21 words
The electrode according to claim 1, wherein the active material for the negative pole of the electrode produces Cr 2+ .
Claim 8
Dependent Claim
58 words
An electrode for a flowcell which comprises an electrode material made of carbon fiber having <002> spacing of quasi-graphite crystalline structure of not more than 3.70 Å, and an average C-axis size of crystallite of not less than 9.0 Å and at least 7% by mole of oxygen atom bound to the fiber surface based on carbon atom.
Claim 9
Dependent Claim
58 words
An electrode for a flowcell which comprises an electrode material made of carbon fiber having <002> spacing of quasi-graphite crystalline structure of not more than 3.70 Å, and an average C-axis size of crystallite of not less than 9.0 Å and at least 7% by mole of oxygen atom bound to the fiber surface based on carbon atom.
Claim 10
Dependent Claim
14 words
The electrode according to claim 7, wherein the carbon fiber constitutes a knitted fabric.
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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) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |