US5772702A
Expired / Lapsed
US
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Method of preparing electrochemical cells
Assignee: Valence Technology Inc
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Filing: 1996-04-10
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Granted: 1998-06-30
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Expires: 2016-04-10
Abstract
Abstract A method of fabricating electrochemical cells wherein precursors thereof can be stored for extended periods of time following extraction of plasticizer therefrom to form porous structures in the polymeric layer and the polymer binder materials of the anode and cathode is provided. Electrochemical cells are produced when the precursors are activated by the addition of an electrolyte solvent and salt.
Inventors
- 👤 Jeremy Barker
- 👤 J. Lee Morris
- 👤 Frederik Flemming
- 👤 Wade W. Guindy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:45
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/13; H01M4/137; H01M10/00; H01M10/05; H01M10/058; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49112; Y10T29/49115
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
146 words
A method of preparing an electrochemical cell comprising the steps of: (a) preparing an anode precursor by forming an anode film comprising a carbon, a first polymeric binder, and a first plasticizer and thereafter extracting said first plasticizer; (b) preparing a cathode precursor by forming a cathode film comprising a cathodic material, a second polymeric binder, and a second plasticizer and thereafter extracting said second plasticizer; (c) preparing an polymeric electrolyte precursor by forming a polymeric matrix comprising a third plasticizer and thereafter extracting said third plasticizer; (d) following steps a-c, storing said anode precursor, said cathode precursor, and said polymeric electrolyte precursor for a period of time from 24 hours to about 4 weeks prior to activation; and (e) activating said anode precursor, said cathode precursor, and said polymeric electrolyte precursor, wherein said polymeric precursor is interposed between said anode precursor and said cathode precursor.
Claim 2
Independent Claim
146 words
A method of preparing an electrochemical cell comprising the steps of: (a) preparing an anode precursor by forming an anode film comprising a carbon, a first polymeric binder, and a first plasticizer and thereafter extracting said first plasticizer; (b) preparing a cathode precursor by forming a cathode film comprising a cathodic material, a second polymeric binder, and a second plasticizer and thereafter extracting said second plasticizer; (c) preparing an polymeric electrolyte precursor by forming a polymeric matrix comprising a third plasticizer and thereafter extracting said third plasticizer; (d) following steps a-c, storing said anode precursor, said cathode precursor, and said polymeric electrolyte precursor for a period of time from 24 hours to about 4 weeks prior to activation; and (e) activating said anode precursor, said cathode precursor, and said polymeric electrolyte precursor, wherein said polymeric precursor is interposed between said anode precursor and said cathode precursor.
Claim 3
Independent Claim
106 words
A method of preparing an electrochemical cell comprising the steps of: (a) forming an anode film comprising a polymeric matrix and a first plasticizer; (b) forming a cathode film comprising a polymeric binder and a second plasticizer; (c) forming a polymeric layer comprising a third plasticizer; (d) interposing said polymeric layer between said anode film and said cathode film; (e) extracting said plasticizers therefrom to form an electrochemical cell precursor; (f) following steps a-e, storing said electrochemical cell precursor for a period of time from 24 hours to about 4 weeks prior to activation; and (g) activating said electrochemical cell precursor to form an electrochemical cell.
Claim 4
Independent Claim
106 words
A method of preparing an electrochemical cell comprising the steps of: (a) forming an anode film comprising a polymeric matrix and a first plasticizer; (b) forming a cathode film comprising a polymeric binder and a second plasticizer; (c) forming a polymeric layer comprising a third plasticizer; (d) interposing said polymeric layer between said anode film and said cathode film; (e) extracting said plasticizers therefrom to form an electrochemical cell precursor; (f) following steps a-e, storing said electrochemical cell precursor for a period of time from 24 hours to about 4 weeks prior to activation; and (g) activating said electrochemical cell precursor to form an electrochemical cell.
Claim 5
Independent Claim
145 words
A method of preparing an electrochemical cell comprising the steps of: (a) preparing an anode precursor by forming an anode film comprising a carbon, a first polymeric binder, and a first plasticizer and thereafter extracting said first plasticizer; (b) preparing a cathode precursor by forming a cathode film comprising a cathodic material, a second polymeric binder and a second plasticizer and thereafter extracting said second plasticizer; (c) preparing an polymeric electrolyte precursor by forming a polymeric matrix comprising a third plasticizer and thereafter extracting said third plasticizer; and (d) activating said anode precursor, said cathode precursor, and said polymeric electrolyte precursor, wherein the polymeric electrolyte is interposed between said anode precursor and said cathode precursor and wherein said anode precursor, said cathode precursor, or polymeric electrolyte precursor was stored for a period of time from 24 hours to about 4 weeks prior to being activated.
Claim 6
Independent Claim
145 words
A method of preparing an electrochemical cell comprising the steps of: (a) preparing an anode precursor by forming an anode film comprising a carbon, a first polymeric binder, and a first plasticizer and thereafter extracting said first plasticizer; (b) preparing a cathode precursor by forming a cathode film comprising a cathodic material, a second polymeric binder and a second plasticizer and thereafter extracting said second plasticizer; (c) preparing an polymeric electrolyte precursor by forming a polymeric matrix comprising a third plasticizer and thereafter extracting said third plasticizer; and (d) activating said anode precursor, said cathode precursor, and said polymeric electrolyte precursor, wherein the polymeric electrolyte is interposed between said anode precursor and said cathode precursor and wherein said anode precursor, said cathode precursor, or polymeric electrolyte precursor was stored for a period of time from 24 hours to about 4 weeks prior to being activated.
Claim 7
Dependent Claim
28 words
The method of claim 1 further comprising the step of fusing said polymeric electrolyte precursor to said anode precursor and to said cathode precursor prior to step (e).
Claim 8
Dependent Claim
28 words
The method of claim 2 further comprising the step of laminating said polymeric electrolyte precursor to said anode precursor and to said cathode precursor prior to step (e).
Claim 9
Dependent Claim
28 words
The method of claim 3 further comprising the step of fusing said polymeric electrolyte precursor to said anode precursor and to said cathode precursor prior to step (d).
Claim 10
Dependent Claim
34 words
The method of claim 1 wherein said anode film is laminated onto a surface of an anode current collector and wherein said cathode film is laminated onto a surface of a cathode current collector.
Claim 11
Dependent Claim
34 words
The method of claim 2 wherein said anode film is laminated onto a surface of an anode current collector and wherein said cathode film is laminated onto a surface of a cathode current collector.
Claim 12
Dependent Claim
34 words
The method of claim 3 wherein said anode film is laminated onto a surface of an anode current collector and wherein said cathode film is laminated onto a surface of a cathode current collector.
Claim 13
Dependent Claim
38 words
The method of claim 7 wherein said anode current collector surface was etched prior to being laminated with said anode film and wherein said cathode current collector surface was etched prior to being laminated with said cathode film.
Claim 14
Dependent Claim
38 words
The method of claim 8 wherein said anode current collector surface was etched prior to being laminated with said anode film and wherein said cathode current collector surface was etched prior to being laminated with said cathode film.
Claim 15
Dependent Claim
38 words
The method of claim 9 wherein said anode current collector surface was etched prior to being laminated with said anode film and wherein said cathode current collector surface was etched prior to being laminated with said cathode film.
Claim 16
Dependent Claim
15 words
The method of claim 1 wherein said first, second, and third plasticizers comprise dibutyl phthalate.
Claim 17
Dependent Claim
15 words
The method of claim 2 wherein said first, second, and third plasticizers comprise dibutyl phthalate.
Claim 18
Dependent Claim
15 words
The method of claim 3 wherein said first, second, and third plasticizers comprise dibutyl phthalate.
Claim 19
Dependent Claim
23 words
The method of claim 1 wherein said polymeric matrix and said first and second polymeric binders comprise a copolymer of vinylidenedifluoride and hexafluoropropylene.
Claim 20
Dependent Claim
23 words
The method of claim 2 wherein said polymeric matrix and said first and second polymeric binders comprise a copolymer of vinylidenedifluoride and hexafluoropropylene.
Claim 21
Dependent Claim
23 words
The method of claim 3 wherein said polymeric matrix and said first and second polymeric binders comprise a copolymer of vinylidenedifluoride and hexafluoropropylene.
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) | 2001-06-29 | 2001-12-29 | 2002-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-29 | 2005-12-29 | 2006-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-29 | 2009-12-29 | 2010-06-30 | $7700.00 | Window Closed / Lapsed |