US5387479A
Expired / Lapsed
US
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Electrodes for rechargeable lithium batteries
Assignee: Valence Technology Inc
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Filing: 1993-06-16
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Granted: 1995-02-07
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Expires: 2013-06-16
Abstract
Abstract In an electrochemical cell having an active metal negative electrode, a positive electrode and a electrolyte separator there is provided a first layer between the negative electrode and the electrolyte separator, the layer comprises a carbon-based material which is a conductor of electrons and a conductor of metal ions of the negative electrode. The layer restricts penetration of electrolytic organic and anionic salt constituents therethrough and prevents degradation of the negative electrode.
Inventors
- 👤 Rene Koksbang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:10
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/052; H01M10/056; H01M10/0564; H01M10/0565; H01M4/00; H01M4/02; H01M4/13; H01M4/36; H01M4/362; H01M4/366; H01M4/38; H01M2004/026; H01M2004/027; H01M2300/00; H01M2300/0017; H01M2300/0025; H01M4/04; H01M4/0402; H01M4/0404; H01M4/40; H01M4/405; H01M4/58; H01M4/583; H01M4/587; H01M4/62; H01M4/621; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
70 words
A battery comprising: a) an electrolyte; b) a negative electrode having an active material consisting essentially of lithium or alloys thereof and being in the form of a solid body having a major surface facing the electrolyte; and c) a layer between the major surface of the electrode and the electrolyte for reducing passivation of the electrode body, said layer comprising particles of carbon retained in a binder matrix material.
Claim 2
Dependent Claim
70 words
A battery comprising: a) an electrolyte; b) a negative electrode having an active material consisting essentially of lithium or alloys thereof and being in the form of a solid body having a major surface facing the electrolyte; and c) a layer between the major surface of the electrode and the electrolyte for reducing passivation of the electrode body, said layer comprising particles of carbon retained in a binder matrix material.
Claim 3
Dependent Claim
17 words
The battery according to claim 1, wherein the particles of carbon are of micron or submicron size.
Claim 4
Dependent Claim
22 words
The battery according to claim 1, wherein the layer comprises submicron size void spaces sufficient for inclusion of (Li + ) ions.
Claim 5
Dependent Claim
31 words
The battery according to claim 3, wherein the carbon and the included lithium are in an atomic ratio of up to about one mole lithium for every six moles of carbon.
Claim 6
Dependent Claim
25 words
The battery according to claim 1, wherein the particles of carbon have pores of a size sufficient for intercalation of lithium (Li + ) ions.
Claim 7
Dependent Claim
20 words
The battery according to claim 1, wherein the layer is a coating carried on the major surface of the electrode.
Claim 8
Dependent Claim
20 words
The battery according to claim 1, wherein the binder is a polymeric conductor of metal ions of the negative electrode.
Claim 9
Dependent Claim
16 words
The battery according to claim 1, wherein the layer at least restricts penetration of the electrolyte.
Claim 10
Dependent Claim
73 words
A battery comprising: a) an electrolyte; b) a negative electrode having an active material consisting essentially of lithium or alloys thereof and being in the form of a solid body having a major surface facing the electrolyte; and c) a layer between the major surface of the electrode and the electrolyte for reducing passivation of the electrode body, said layer being electronically conductive and ionically conductive of metal ions of the negative electrode.
Claim 11
Dependent Claim
73 words
A battery comprising: a) an electrolyte; b) a negative electrode having an active material consisting essentially of lithium or alloys thereof and being in the form of a solid body having a major surface facing the electrolyte; and c) a layer between the major surface of the electrode and the electrolyte for reducing passivation of the electrode body, said layer being electronically conductive and ionically conductive of metal ions of the negative electrode.
Claim 12
Dependent Claim
20 words
The battery according to claim 9, wherein the layer is a coating carried on the major surface of the electrode.
Claim 13
Dependent Claim
34 words
The battery according to claim 9, wherein the layer consists essentially of carbon graphite deposited on the electrode in successive sublayers having interlayers of spacing sufficient for intercalation of lithium (Li + ) ions.
Claim 14
Dependent Claim
82 words
In a battery having a lithium-containing negative electrode body, a positive electrode body, an electrolyte separator in the form of a polymeric network containing an electrolyte solution comprising a metal salt of the negative electrode disposed between the negative and positive electrode bodies, the improvement comprising a layer between the negative electrode body and the polymeric network, said layer comprising carbon-based material being electronically conductive and conductive of metal ions of the negative electrode and capable of restricting penetration of electrolyte therethrough.
Claim 15
Dependent Claim
82 words
In a battery having a lithium-containing negative electrode body, a positive electrode body, an electrolyte separator in the form of a polymeric network containing an electrolyte solution comprising a metal salt of the negative electrode disposed between the negative and positive electrode bodies, the improvement comprising a layer between the negative electrode body and the polymeric network, said layer comprising carbon-based material being electronically conductive and conductive of metal ions of the negative electrode and capable of restricting penetration of electrolyte therethrough.
Claim 16
Dependent Claim
17 words
The battery according to claim 12, wherein the carbon-based material consists essentially of carbon or lithiated carbon.
Claim 17
Dependent Claim
26 words
The battery according to claim 12, wherein the carbon-based material comprises a matrix material and particles of carbon or lithiated carbon retained by the matrix material.
Claim 18
Independent Claim
73 words
A method of making an electrode structure for a lithium battery having metallic lithium or lithium alloy active material comprising: a) forming a mixture of polymeric binder material and carbon particles; and b) applying the mixture onto a major surface of the metallic lithium body and curing the applied mixture for a time sufficient to form an adhered coating of said mixture on the body with said carbon particles retained by the matrix.
Claim 19
Independent Claim
73 words
A method of making an electrode structure for a lithium battery having metallic lithium or lithium alloy active material comprising: a) forming a mixture of polymeric binder material and carbon particles; and b) applying the mixture onto a major surface of the metallic lithium body and curing the applied mixture for a time sufficient to form an adhered coating of said mixture on the body with said carbon particles retained by the matrix.
Claim 20
Dependent Claim
23 words
The method according to claim 15, wherein the curing is by electron beam radiation sufficient to provide cross-linking of the polymeric binder material.
Claim 21
Dependent Claim
14 words
The battery according to claim 1 wherein the layer prevents penetration of the electrolyte.
Claim 22
Dependent Claim
12 words
The battery according to claim 1 wherein the carbon is graphitic carbon.
Claim 23
Dependent Claim
12 words
The battery according to claim 12 wherein the layer comprises graphitic carbon.
Claim 24
Dependent Claim
18 words
The battery according to claim 9 wherein the layer consists essentially of graphitic carbon and lithiated graphitic carbon.
Claim 25
Dependent Claim
27 words
The battery according to claim 9 wherein the carbon based material comprises a polymeric matrix material which is a conductor of metal ions of the negative electrode.
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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) | 1998-02-06 | 1998-08-08 | 1999-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-06 | 2002-08-08 | 2003-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-06 | 2006-08-08 | 2007-02-07 | $7700.00 | Window Closed / Lapsed |