Patent US4902589A successfully refreshed from Google Patents.
US4902589A
Expired / Lapsed
US
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Electrochemical cells, electrodes and methods of manufacture
Assignee: Moli Energy Ltd
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Filing: 1988-06-08
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Granted: 1990-02-20
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Expires: 2008-06-08
Abstract
Abstract An electrode precursor for lithium batteries includes a layer of an electrochemically active particulate material and a binder. The binder is soluble in the cell electrolyte so that the electrolyte extracts the binder from the particulate material after assembly, leaving a particulate layer substantially devoid of binder. Thus, the binder does not significantly decrease electrical conductivity of the layer in the cell and does not impede the ionic access to the layer. The soluble binder may be present in the electrode precursor in an amount sufficient to protect particulate which would otherwise react with the atmosphere.
Inventors
- 👤 Jeffery R. Dahn
- 👤 David Wainwright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:58
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M4/00; H01M4/02; H01M4/36; H01M4/58; H01M4/581; H01M4/62; H01M4/621; H01M6/00; H01M6/04; H01M6/06; H01M6/10; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49114
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
An electrochemical cell including: a first electrode having a convoluted substantially internally non-coherent layer of a particulate, electrochemically active material, substantially devoid of interstitial binder connecting the particles of said active material to one another, overlying a convoluted sheet-like metallic foil support; a counterelectrode space from said layer; an electrolyte in contact with said layer and said counterelectrode; and means for maintaining a compressive load on said substantially internally non-coherent layer of particulate materials; wherein said compressive load maintains said particulate material in a coherent layer.
Claim 2
Dependent Claim
86 words
An electrochemical cell including: a first electrode having a convoluted substantially internally non-coherent layer of a particulate, electrochemically active material, substantially devoid of interstitial binder connecting the particles of said active material to one another, overlying a convoluted sheet-like metallic foil support; a counterelectrode space from said layer; an electrolyte in contact with said layer and said counterelectrode; and means for maintaining a compressive load on said substantially internally non-coherent layer of particulate materials; wherein said compressive load maintains said particulate material in a coherent layer.
Claim 3
Dependent Claim
28 words
A cell according to claim 1 wherein said layer is juxtaposed with a sheetlike porous separator so that said layer is disposed between said support and said separator.
Claim 4
Dependent Claim
39 words
A cell according to claim 2 wherein said counterelectrode includes a sheetlike counter structure, and the separator is disposed between the counter structure and the layer so that said counter structure, separator, layer and support form a sandwich structure.
Claim 5
Dependent Claim
16 words
A cell according to claim 3 further comprising means for maintaining said sandwich structure under compression.
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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) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |