US5554462A
Expired / Lapsed
US
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Carbon anode for a lithium rechargeable electrochemical cell and a process for its production
Assignee: SAFT Societe des Accumulateurs Fixes et de Traction SA
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Filing: 1994-12-21
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Granted: 1996-09-10
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Expires: 2014-12-21
Abstract
Abstract The present invention concerns a carbon anode for a lithium rechargeable electrochemical cell, comprising a graphite-containing carbon-containing material which includes, prior to electrical cycling, at least a first phase constituted by graphite having a rhombohedral crystal structure and comprising a fraction of more than 10%.
Inventors
- 👤 Serge Flandrois
- 👤 Annie Fevrier
- 👤 Philippe Biensan
- 👤 Bernard Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:30
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/58; H01M4/583; H01M4/587; C; C01; C01B; C01B32/00; C01B32/20; C01B32/21; C01P; C01P2006/00; C01P2006/40; H01M10/00; H01M10/05; H01M10/052; H01M10/0525; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
A carbon anode for a lithium rechargeable electrochemical cell that also includes a cathode and an electrolyte, the anode comprising a graphite-containing carbon-containing material, wherein said material includes, prior to electrical cycling, at least a first rhombohedral phase constituted by graphite having a rhombohedral crystal structure, wherein the rhombohedral phase comprises a fraction of more than 10% of the graphite-containing carbon-containing material.
Claim 2
Dependent Claim
62 words
A carbon anode for a lithium rechargeable electrochemical cell that also includes a cathode and an electrolyte, the anode comprising a graphite-containing carbon-containing material, wherein said material includes, prior to electrical cycling, at least a first rhombohedral phase constituted by graphite having a rhombohedral crystal structure, wherein the rhombohedral phase comprises a fraction of more than 10% of the graphite-containing carbon-containing material.
Claim 3
Dependent Claim
26 words
An anode according to claim 1, in which said material includes said first phase in a fraction of more than 14% of the graphite-containing carbon-containing material.
Claim 4
Dependent Claim
23 words
An anode according to claim 1, in which said material further includes a second phase constituted by graphite having a hexagonal crystal structure.
Claim 5
Dependent Claim
39 words
An anode according to claim 1, also containing a binder selected from the group consisting of fluorine-containing polymers and copolymers thereof, fluorine-containing elastomers, ethylene-propylene-diene terpolymers with a methylene main chain, carboxymethylcellulose, copolymers of styrene and butadiene, and mixtures thereof.
Claim 6
Dependent Claim
87 words
A process for the production of a carbon-containing graphite-containing material including at least one phase constituted by a rhombohedral crystal structure graphite and in a fraction of more than 10% of the carbon-containing graphite-containing material, said process comprising the following steps: (a) introducing graphite into a liquid which is chemically inert to said graphite; (b) generating ultrasound waves in said liquid by vibrating an element which is in contact with said liquid; (c) separating said carbon-containing graphite-containing material from the liquid, then drying the carbon-containing graphite-containing material.
Claim 7
Dependent Claim
87 words
A process for the production of a carbon-containing graphite-containing material including at least one phase constituted by a rhombohedral crystal structure graphite and in a fraction of more than 10% of the carbon-containing graphite-containing material, said process comprising the following steps: (a) introducing graphite into a liquid which is chemically inert to said graphite; (b) generating ultrasound waves in said liquid by vibrating an element which is in contact with said liquid; (c) separating said carbon-containing graphite-containing material from the liquid, then drying the carbon-containing graphite-containing material.
Claim 8
Dependent Claim
38 words
A process according to claim 5, wherein said liquid is selected from the group consisting of acetonitrile, water and an aqueous mixture containing a compound selected from the group consisting of an alcohol, a ketone and a salt.
Claim 9
Dependent Claim
48 words
A process according to claim 6, wherein in generating step (b) the ultrasound waves have an amplitude greater than 80 μm, the liquid has a temperature between the freezing point of said liquid and 20° C., and the ultrasound waves have a period of at least 10 minutes.
Claim 10
Dependent Claim
12 words
A lithium rechargeable electrochemical cell comprising an anode according to claim 1.
Claim 11
Dependent Claim
38 words
A lithium rechargeable electrochemical cell according to claim 8, comprising a cathode containing a transition metal oxide selected from the group consisting of vanadium oxide, lithium-containing manganese oxides, and oxides of nickel, cobalt, iron, titanium and mixtures thereof.
References Cited (Backward Citations)
JPS57208079A
Cited
US4749514A
Cited
EP0239410A2
Cited
US4980250A
Cited
JPS63102166A
Cited
EP0267791A2
Cited
US4945014A
Cited
JPH04280068A
Cited
US5288438A
Cited
EP0573266A1
Cited
US5415957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-10 | 2000-03-11 | 2000-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-10 | 2004-03-11 | 2004-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-10 | 2008-03-11 | 2008-09-10 | $7700.00 | Window Closed / Lapsed |