US4352768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber reinforced cathode for electrochemical cell
Assignee: Yardney Technical Products Inc
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Filing: 1979-11-13
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Granted: 1982-10-05
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Expires: 1999-11-13
Abstract
Abstract An improved preformed cathode is described for use in a primary electrochemical cell. The novel cathode of the present invention is a self-supporting member having a configuration which is determined by the spatial limitations of the particular primary electrochemical cell in which the cathode is to be utilized. The cathode is formed from about 65 to 94 weight percent of carbon black, at least 1 weight percent of a mechanical binder which is inert in the primary electrochemical cell, 1 to 10 weight percent of a fibrous material such as carbon, glass, ceramic fluoropolymer, and/or metallic fibers, and any remainder thereof is graphite powder. The preformed cathode is formed by mixing the individual components together with a quantity of a suitable liquid to form a uniform mixture which is sheeted to a self-supporting structure of the desired thickness. Thereafter, the preformed cathode is dried, cured for a period of time sufficient to remove substantially all of the liquid and to stabilize the mechanical binder, and cut into discs for assembly into cells.
Inventors
- 👤 James Epstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:26
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/663; H01M4/86; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
A method for forming a preformed cathode for a primary electrochemical cell comprising the steps of: mixing a quantity of carbon black particles with from 1 to 10 weight percent of the mixture of a fibrous additive and an effective amount of suitable liquid to form a uniform slurry; adding a quantity of a mechanical binder which is inert in the primary electrochemical cell to the slurry, the quantity of mechanical binder being at least 1 percent by weight of the resulting preformed cathode; remixing the slurry to disperse uniformly the binder through the slurry; sheeting the slurry; drying the sheeted slurry; and curing the preformed cathode for a time sufficient to remove substantially all of the liquid and to stabilize the mechanical binder thereby producing a self-supporting reinforced member for insertion into a primary electrochemical cell.
Claim 2
Independent Claim
137 words
A method for forming a preformed cathode for a primary electrochemical cell comprising the steps of: mixing a quantity of carbon black particles with from 1 to 10 weight percent of the mixture of a fibrous additive and an effective amount of suitable liquid to form a uniform slurry; adding a quantity of a mechanical binder which is inert in the primary electrochemical cell to the slurry, the quantity of mechanical binder being at least 1 percent by weight of the resulting preformed cathode; remixing the slurry to disperse uniformly the binder through the slurry; sheeting the slurry; drying the sheeted slurry; and curing the preformed cathode for a time sufficient to remove substantially all of the liquid and to stabilize the mechanical binder thereby producing a self-supporting reinforced member for insertion into a primary electrochemical cell.
Claim 3
Dependent Claim
50 words
A method according to claim 1 including, subsequent to remixing the slurry, the steps of dispersing the slurry onto a flat surface; spreading the slurry out in a layer of uniform thickness; rolling the layer to the desired thickness; and subsequently drying the sheeted slurry and curing the preformed cathode.
Claim 4
Independent Claim
154 words
A method for forming a preformed cathode for a primary electrochemical cell comprising the steps of: mixing a quantity of carbon black particles with a quantity of graphite powder and an effective amount of suitable liquid for forming a uniform slurry; adding a quantity of a mechanical binder which is inert in the primary electrochemical cell to the slurry, the quantity of mechanical binder being at least 1 percent by weight of the resulting preformed cathode; remixing the slurry to disperse uniformly the binder through the slurry and while remixing adding a fibrous additive in an amount of from 1 to 10 weight percent of the mixture of carbon black and graphite; sheeting the slurry; drying the sheeted slurry; and curing the preformed cathode for a time sufficient to remove substantially all of the liquid and to stabilize the mechanical binder thereby producing a self-supporting reinforced member, for insertion into the primary electrochemical cell.
Claim 5
Independent Claim
154 words
A method for forming a preformed cathode for a primary electrochemical cell comprising the steps of: mixing a quantity of carbon black particles with a quantity of graphite powder and an effective amount of suitable liquid for forming a uniform slurry; adding a quantity of a mechanical binder which is inert in the primary electrochemical cell to the slurry, the quantity of mechanical binder being at least 1 percent by weight of the resulting preformed cathode; remixing the slurry to disperse uniformly the binder through the slurry and while remixing adding a fibrous additive in an amount of from 1 to 10 weight percent of the mixture of carbon black and graphite; sheeting the slurry; drying the sheeted slurry; and curing the preformed cathode for a time sufficient to remove substantially all of the liquid and to stabilize the mechanical binder thereby producing a self-supporting reinforced member, for insertion into the primary electrochemical cell.
Claim 6
Dependent Claim
50 words
A method according to claim 3 including, subsequent to remixing the slurry, the steps of dispersing the slurry onto a flat surface; spreading the slurry out in a layer of uniform thickness; rolling the layer to the desired thickness; and subsequently drying the sheeted slurry and curing the preformed cathode.
Claim 7
Dependent Claim
29 words
A method according to claim 4 wherein the quantities of carbon black and graphite are initially dry mixed to assure a uniform distribution of carbon black and graphite particles.
Claim 8
Dependent Claim
13 words
A method according to claim 5 wherein the mechanical binder is fluorocarbon polymer.
Claim 9
Independent Claim
158 words
A method for forming a preformed cathode for a primary electrochemical cell comprising the steps of: mixing a quantity of carbon black particles with a quantity of graphite powder and an effective amount of suitable liquid for forming a uniform slurry; adding a quantity of a mechanical binder which is inert in the primary electrochemical cell to the slurry, the quantity of mechanical binder being at least 1 percent by weight of the resulting preformed cathode; remixing the slurry to disperse uniformly the binder through the slurry; adding a fibrous additive in an amount of from 1 to 10 weight percent of the mixture of carbon black and graphite; remixing the slurry to blend the materials; sheeting the slurry; drying the sheeted slurry; and curing the preformed cathode for a time sufficient to remove substantially all of the liquid and to stabilize the mechanical binder thereby producing a self-supporting reinforced member, for insertion into the primary electrochemical cell.
Claim 10
Independent Claim
158 words
A method for forming a preformed cathode for a primary electrochemical cell comprising the steps of: mixing a quantity of carbon black particles with a quantity of graphite powder and an effective amount of suitable liquid for forming a uniform slurry; adding a quantity of a mechanical binder which is inert in the primary electrochemical cell to the slurry, the quantity of mechanical binder being at least 1 percent by weight of the resulting preformed cathode; remixing the slurry to disperse uniformly the binder through the slurry; adding a fibrous additive in an amount of from 1 to 10 weight percent of the mixture of carbon black and graphite; remixing the slurry to blend the materials; sheeting the slurry; drying the sheeted slurry; and curing the preformed cathode for a time sufficient to remove substantially all of the liquid and to stabilize the mechanical binder thereby producing a self-supporting reinforced member, for insertion into the primary electrochemical cell.
Claim 11
Dependent Claim
54 words
A method according to claim 7 including, subsequent to remixing the slurry to blend the materials, the steps of dispersing the slurry onto a flat surface; spreading the slurry out in a layer of uniform thickness; rolling the layer to the desired thickness; and subsequently drying the sheeted slurry and curing the preformed cathode.
References Cited (Backward Citations)
US2799053A
Cited
US3658976A
Cited
US3838188A
Cited
US4102960A
Cited
US4127634A
Cited
US4161063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |