Patent US5158722A successfully refreshed from Google Patents.
US5158722A
Expired / Lapsed
US
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Process for the production of a positive electrode in ribbon form for primary and secondary cells
Assignee: VARTA Microbattery GmbH
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Filing: 1991-05-06
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Granted: 1992-10-27
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Expires: 2011-05-06
Abstract
Abstract Positive ribbon electrodes for primary and secondary cells are produced in a dry process wherein two strips of active material in powder form, preferably comprised of MnO 2 , FeS 2 , CuO, α-Cu 2 V 2 O 7 , and Li x MnO y , are simultaneously rolled and then fed into the gap of a roller mechanism, on opposite sides of an interposed metal net or mesh, to roll coat both sides of the lattice-like carrier strip. After excess mass is stripped off, the finished electrode ribbon has a thickness of less than 0.45 mm and a porosity of more than 24% which, because of its large active surface, is advantageously used in wound batteries incorporating Li or H 2 electrodes.
Inventors
- 👤 Dejan Ilic
- 👤 Hans Sauer
- 👤 Dirk Neumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:26
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; H01M4/505; H01M4/04; H01M4/0402; H01M4/0404; H01M4/043; H01M4/0435; H01M4/58; H01M4/581; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
A process for producing a positive electrode in the form of a ribbon for primary and secondary cells, comprising the steps of: simultaneously rolling two strips of a dry powder mixture of an electrochemically active material and a binder; introducing a current collector formed of a metal net or mesh, and the strips, into a gap defined by a pair of rollers so that the current collector enters between the rollers with the strips positioned on opposite sides thereof; and compressing the strips against the current collector, coating both sides of the current collector with the dry powder mixture of the strips and filling interstices of the metal net or mesh.
Claim 2
Dependent Claim
111 words
A process for producing a positive electrode in the form of a ribbon for primary and secondary cells, comprising the steps of: simultaneously rolling two strips of a dry powder mixture of an electrochemically active material and a binder; introducing a current collector formed of a metal net or mesh, and the strips, into a gap defined by a pair of rollers so that the current collector enters between the rollers with the strips positioned on opposite sides thereof; and compressing the strips against the current collector, coating both sides of the current collector with the dry powder mixture of the strips and filling interstices of the metal net or mesh.
Claim 3
Dependent Claim
19 words
The process of claim 1 which further comprises the step of stripping excess material from the coated electrode ribbon.
Claim 4
Dependent Claim
18 words
The process of claim 2 which further comprises the step of winding the coated electrode ribbon for storage.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the electrode ribbon is rolled to a final thickness of at most 2.0 mm.
Claim 6
Dependent Claim
17 words
The process of claim 4 wherein the final thickness is from about 0.2 to about 0.4 mm.
Claim 7
Dependent Claim
16 words
The process of claim 4 wherein the electrode ribbon has a porosity of at least 24%.
Claim 8
Dependent Claim
15 words
The process of claim 6 wherein the porosity is from about 28 to about 30%.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein the electrochemically active material of the electrode is selected from the group consisting of MnO 2 , FeS 2 or CuO.
Claim 10
Dependent Claim
30 words
The process of claim 1 wherein the electrochemically active material of the electrode is α-Cu 2 V 2 O 7 or Li x MnO y wherein 1.5<x<2 and 2.5<y <3.
Claim 11
Dependent Claim
18 words
The process of claim 1 which further comprises the step of regulating the final thickness of the electrode.
Claim 12
Dependent Claim
24 words
The process of claim 10 wherein said regulating includes the step of measuring and metering the dry powder mixture before the strips are rolled.
Claim 13
Dependent Claim
21 words
The process of claim 10 wherein said regulating includes the step of adjusting the gap defined by the pair of rollers.
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) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |