US4565751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for high current density and high power density electrochemical cells
Assignee: Ultralife Corp
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Filing: 1984-06-18
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Granted: 1986-01-21
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Expires: 2004-06-18
Abstract
Abstract A cathode comprising a current collector coated with a dispersion of (CFx)n wherein x is equal to or less than 1.2 and n is an indeterminately large number, a current carrier and a binder characterized in that the current collector is a conductive foil, the binder is sufficiently adhesive to adhere the coated dispersion to the conductive foil and the coated dispersion has a porosity greater than 43 percent. The cathodes are useful in electrochemical cells having light metal anodes.
Inventors
- 👤 Marilyn A. Faust
- 👤 Hans W. Osterhoudt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:32
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/661; H01M4/06; H01M4/62; H01M4/621; H01M4/668; H01M4/669; H01M6/00; H01M6/14; H01M6/16; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
71 words
A cathode comprising a current collector coated with a dispersion of (CF x ) n wherein x is equal to or less than 1.2 and n is an indeterminately large number, a current carrier and a binder characterized in that the current collector is a metal foil, the binder is sufficiently adhesive to adhere the coated dispersion to the metal foil and the coated dispersion has a porosity of 57-73 percent.
Claim 2
Dependent Claim
71 words
A cathode comprising a current collector coated with a dispersion of (CF x ) n wherein x is equal to or less than 1.2 and n is an indeterminately large number, a current carrier and a binder characterized in that the current collector is a metal foil, the binder is sufficiently adhesive to adhere the coated dispersion to the metal foil and the coated dispersion has a porosity of 57-73 percent.
Claim 3
Dependent Claim
36 words
The cathode of claim 1 wherein the coated dispersion comprises from 70 to 90 weight percent (CF x ) n , from 5 to 20 weight percent carbon and from 3 to 15 weight percent binder.
Claim 4
Dependent Claim
25 words
The cathode of claim 1 wherein the current collector is a metal foil selected from the group consisting of stainless steel, nickel, aluminum and titanium.
Claim 5
Dependent Claim
36 words
The cathode of claim 1 wherein the binder is selected from the group consisting of poly(vinyl acetate)-based adhesives, polyester- and polyol-based polyurethanes, styrene-butadiene copolymers and terpolymers, ethylene-propylene rubbers, polyolefins, polyamides, polyesters, poly(vinyl halides) and poly(vinylidene halides).
Claim 6
Dependent Claim
11 words
The cathode of claim 1 wherein the current carrier is carbon.
Claim 7
Dependent Claim
48 words
The cathode of claim 1 having a stainless steel foil current collector coated with a dispersion of 75 weight percent (CF x ) n , 10 weight percent carbon and about 15 weight percent poly(vinyl acetate)-based adhesive in which the coated dispersion has a porosity of 57-73 percent.
Claim 8
Dependent Claim
51 words
The cathode of claim 1 having a nickel foil current collector coated with a dispersion of about 75 weight percent of (CF x ) n , about 10 weight percent carbon and about 15 weight percent poly(vinyl acetate)-based adhesive in which the coated dispersion has a porosity of from 57-73 percent.
Claim 9
Dependent Claim
85 words
An electrochemical cell comprising: (a) a light metal anode; (b) an electrolyte; and (c) a cathode comprising a current collector coated with a dispersion of (CF x ) n wherein x is equal to or less than 1.2 and n is an indeterminately large number, a current carrier and a binder characterized in that the current collector is a metal foil, the binder is sufficiently adhesive to adhere the coated dispersion to the metal foil and the coated dispersion has a porosity of 57-73 percent.
Claim 10
Dependent Claim
85 words
An electrochemical cell comprising: (a) a light metal anode; (b) an electrolyte; and (c) a cathode comprising a current collector coated with a dispersion of (CF x ) n wherein x is equal to or less than 1.2 and n is an indeterminately large number, a current carrier and a binder characterized in that the current collector is a metal foil, the binder is sufficiently adhesive to adhere the coated dispersion to the metal foil and the coated dispersion has a porosity of 57-73 percent.
Claim 11
Dependent Claim
10 words
The electrochemical cell of claim 1 comprising a lithium anode.
Claim 12
Dependent Claim
78 words
The electrochemical cell of claim 1 wherein the electrolyte comprises a lithium salt, selected from the group consisting of LiClO 4 and LiBF 4 , dissolved in a solvent blend of (a) at least 40 volume percent of an anhydrous, aprotic organic liquid having a surface tension of less than 25 dynes/cm and a molecular weight of 40-120; and (b) up to 60 volume percent of an anhydrous organic liquid having a dielectric constant of at least 25.
Claim 13
Dependent Claim
45 words
The electrochemical cell of claim 8 or 9 wherein the coated cathode dispersion comprises from about 75 to 95 weight percent (CF x ) n , from about 5 to 10 weight percent carbon and from 3 to 15 weight percent of an adhesive binder.
Claim 14
Dependent Claim
12 words
The electrochemical cell of claim 8 or 9 in a spiral-wound format.
Claim 15
Dependent Claim
28 words
The electrochemical cell of claim 8 or 9 wherein the current collector is a metal foil selected from the group consisting of stainless steel, nickel, aluminum and titanium.
Claim 16
Dependent Claim
17 words
The electrochemical cell of claim 8 or 9 wherein the electrolyte is 1M LiBF 4 in γ-butyrolactone.
Claim 17
Dependent Claim
22 words
The electrochemial cell of claim 8 wherein the electrolyte comprises LiClO 4 dissolved in a 1:1 mixture of propylene carbonate and dimethoxyethane.
Claim 18
Dependent Claim
60 words
The electrochemical cell of claim 8 wherein (a) the electrolyte comprises LiClO 4 dissolved in a 1:1 mixture of propylene carbonate and dimethoxyethane; and (b) the cathode has a nickel foil current collector coated with a dispersion of about 75 weight percent (CF x ) x , about 10 weight percent carbon and about 15 weight percent poly(vinyl acetate)-based adhesive.
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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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |