US4968527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of pyrolytic graphite with high crystallinity and electrodes with the same for rechargeable batteries
Assignee: Sharp Corp
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Filing: 1988-10-31
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Granted: 1990-11-06
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Expires: 2008-10-31
Abstract
Abstract A method for the manufacture of a pyrolytic graphite with high crystallinity comprising the deposition of graphite directly onto a crystalline catalytic substrate by thermal decomposition of a carbon-containing material at a temperature of 1000° C. or less, the pyrolytic graphite having interlayer spacing in a limited range and a c-axis orientation of carbon layers perpendicular to the surface of the substrate. An electrode with graphite as an active material and a crystalline metal electrode substrate as a current collector unified, the graphite being pyrolytic graphite that is deposited on the crystalline metal electrode substrate with catalytic properties so as to cover the crystalline metal electrode substrate by the above-mentioned method.
Inventors
- 👤 Yoshikazu Yoshimoto
- 👤 Tomonari Suzuki
- 👤 Hiroshi Wada
- 👤 Masaru Yoshida
- 👤 Shigeo Nakajima
- 👤 Yoshimitsu Tajima
- 👤 Nobuhiro Yanagisawa
- 👤 Motoo Mohri
- 👤 Michiyo Kasahara
- 👤 Hideaki Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:06
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/13; H01M4/133; B; B82; B82Y; B82Y30/00; C; C01; C01B; C01B32/00; C01B32/20; C01B32/205; C01B32/21; C01B32/22; C23; C23C; C23C16/00; C23C16/22; C23C16/26; D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/127; D01F9/1271; D01F9/1272; D01F9/1273; D01F9/1275; D01F9/1276; D01F9/133; H01M10/00; H01M10/05; H01M10/052; H01M10/0525; H01M4/36; H01M4/58; H01M4/583; H01M4/86; H01M4/96; C01P; C01P2002/00; C01P2002/70; C01P2002/78; H01M4/587; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A method for the manufacture of a pyrolytic graphite comprising the deposition of graphite directly onto a crystalline catalytic substrate by thermal decomposition of a carbon-containing material at a temperature of 1000° C. or less, said pyrolytic graphite having interlayer spacing in the range of 3.35 to 3.55 Å and a c-axis orientation of carbon layers perpendicular to the surface of said substrate.
Claim 2
Independent Claim
63 words
A method for the manufacture of a pyrolytic graphite comprising the deposition of graphite directly onto a crystalline catalytic substrate by thermal decomposition of a carbon-containing material at a temperature of 1000° C. or less, said pyrolytic graphite having interlayer spacing in the range of 3.35 to 3.55 Å and a c-axis orientation of carbon layers perpendicular to the surface of said substrate.
Claim 3
Dependent Claim
43 words
A method according to claim 1, wherein said carbon-containing material is at least one compound selected from the group consisting of acetylene, diphenyl-acetylene, acrylonitrile, 1,2-dibromo-ethylene, 2-butyne, benzene, toluene, pyridine, aniline, phenol, diphenyl, anthracene, pyrene, hexamethylbenzene, styrene, allylbenzene, cyclohexane, n-hexane, propane, pyrrole, and thiophene.
Claim 4
Dependent Claim
23 words
A method according to claim 1, wherein said crystalline catalytic substrate is made of iron, cobalt, nickel, or an alloy of these metals.
Claim 5
Dependent Claim
52 words
An electrode with graphite as an active material and a crystalline metal electrode substrate as a current collector unified, said graphite being pyrolytic graphite that is deposited on said crystalline metal electrode substrate with catalytic properties so as to cover said crystalline metal electrode substrate by the method according to claim 1.
Claim 6
Dependent Claim
24 words
An electrode according to claim 4, wherein said crystalline metal electrode substrate is made of iron, cobalt, nickel, or an alloy of these metals.
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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) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |