Patent US4584252A successfully refreshed from Google Patents.
US4584252A
Expired / Lapsed
US
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Insertion compounds of graphite with improved performances and electrochemical applications of those compounds
Assignee: Mersen SA
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Filing: 1984-05-21
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Granted: 1986-04-22
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Expires: 2004-05-21
Abstract
Abstract The present invention relates to insertion compounds with improved performances for electrochemical applications. They are characterized in that they are obtained from a graphite with a specific surface area of at least 100 m2/g, and a granulometry at most equal to 4 mu m. The graphite oxide or the graphite-NiCl2 first stage obtained from such a graphite is used as constituting agent of the cathode of a lithium battery and it gives to same excellent characteristics. The graphite oxide performances may further be improved by preparing it by double oxidation of a graphite having any specific surface area and the granulometry is of the order of the mu m, as shown by FIG. 2 which represents the intensiostatic discharge curves of the lithium batteries the cathode of which contains the graphite oxide.
Inventors
- 👤 Philippe Touzain
- 👤 Rachid Yazami
- 👤 Jacques Maire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:01
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/58; H01M4/583; C; C01; C01B; C01B32/00; C01B32/20; C01B32/21; C01B32/23; H01M6/00; H01M6/14; H01M6/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
50 words
An electrochemical generator electrode comprising a graphite oxide mixed with a graphite insertion compound with a chloride of a transition metal, said graphite oxide being obtained from a graphite having a specific surface area of at least 100 m 2 /g, and a granulometry at most equal to 4 microns.
Claim 2
Dependent Claim
50 words
An electrochemical generator electrode comprising a graphite oxide mixed with a graphite insertion compound with a chloride of a transition metal, said graphite oxide being obtained from a graphite having a specific surface area of at least 100 m 2 /g, and a granulometry at most equal to 4 microns.
Claim 3
Dependent Claim
39 words
An electrochemical generator electrode according to claim 1, characterized in that the graphite oxide is obtained by means of two successive oxidations of the graphite which has a specific surface area of at least 100 square meters per gram.
Claim 4
Dependent Claim
29 words
An electrochemical generator electrode according to claim 1, characterized in that the graphite insertion compound with a chloride of a transition metal is the C 7 MnCl 2 compound.
Claim 5
Dependent Claim
53 words
An electrochemical generator electrode comprising a graphite insertion compound of a graphite--NiCl 2 compound of the first stage: C 6 NiCl 2 , said graphite insertion compound being obtained from a graphite having a specific surface area of at least 100 m 2 /g, and a granulometry at most equal to 4 microns.
Claim 6
Dependent Claim
53 words
An electrochemical generator electrode comprising a graphite insertion compound of a graphite--NiCl 2 compound of the first stage: C 6 NiCl 2 , said graphite insertion compound being obtained from a graphite having a specific surface area of at least 100 m 2 /g, and a granulometry at most equal to 4 microns.
Claim 7
Dependent Claim
74 words
An electrochemical generator comprising at least one electrode as claimed in claim 4 and characterized in that its electrochemical chain is of the type: Li/1M LiClO 4 solution in propylene carbonate/graphite-NiCl 2 insertion compound, C 6 NiCl 2 , its threshold voltage during an intentiostatic discharge with a current density of 100 μA/cm 2 is 2.5 V, its theoretical energy density is 700 Wh/kg, its Faradaic efficiency is 95%, its energy efficiency is 85%.
Claim 8
Dependent Claim
20 words
An electrochemical generator characterized in that it comprises at least one electrode such as claimed in claim 1 or 4.
Claim 9
Dependent Claim
97 words
An electrochemical generator comprising at least one electrode containing a graphite insertion compound obtained from a graphite having a specific surface area of at least 100 m 2 /g and a granulometry at most equal to 4 microns, characterized in that its electrochemical chain is of the type: Li/solution 1M of LiClO 4 , in propylene carbonate/graphite oxide mixed with graphite, its threshold voltage during an intensiostatic discharge with a current density of 100 μA/cm 2 , is 2.5 its theoretical energy density is 2365 Wh/kg, V, its Faradaic efficiency is 90%, its energy yield is 75%.
Claim 10
Dependent Claim
97 words
An electrochemical generator comprising at least one electrode containing a graphite insertion compound obtained from a graphite having a specific surface area of at least 100 m 2 /g and a granulometry at most equal to 4 microns, characterized in that its electrochemical chain is of the type: Li/solution 1M of LiClO 4 , in propylene carbonate/graphite oxide mixed with graphite, its threshold voltage during an intensiostatic discharge with a current density of 100 μA/cm 2 , is 2.5 its theoretical energy density is 2365 Wh/kg, V, its Faradaic efficiency is 90%, its energy yield is 75%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |