US4228224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive electrode for electrical energy storage device
Assignee: Boeing North American Inc
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Filing: 1979-04-12
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Granted: 1980-10-14
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Expires: 1999-04-12
Abstract
Abstract The rechargeable electrical energy storage device including spaced-apart negative electrode and positive electrode structures immersed in an electrolyte which is molten at the operating temperature of the device wherein the positive electrode structure comprises a housing for containing a body of electropositive active material, said housing having at least one open face, an electrolyte permeable member affixed to the housing and covering said open face for retaining said active material in said housing and said housing and electrolyte permeable member comprising material selected from the group consisting of steel, nickel, copper and alloys thereof having at least an 8 μm thick electroless nickel coating thereon. In accordance with the present invention it has been found that such an electroless nickel coating permits the use of relatively inexpensive conductive materials such as steel, nickel, copper and alloys thereof and provides the corrosion resistance required in the molten electrolyte. The present invention is particularly applicable to electrical energy storage devices which utilize a transition metal chalcogenide as a positive electrode active material and a lithium alloy as the negative electrode active material.
Inventors
- 👤 Laszlo A. Heredy
- 👤 Lowell R. McCoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:54
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M10/00; H01M10/36; H01M10/39; H01M10/399; H01M4/661; H01M4/664; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
130 words
In a rechargeable electrical energy storage device including a lithium halide-containing salt electrolyte which is molten at the operating temperature of the device, and electropositive and electronegative electrode structures spaced apart in said electrolyte, the improvement wherein said electropositive electrode structure comprises: a housing for containing a body of electropositive active material, said housing having at least one open face; an electrolyte-permeable member affixed to said housing and covering said open face for retaining said active material in said housing; and said housing and electrolyte-permeable member comprising a material selected from the group consisting of steel, nickel, copper and alloys thereof having at least a 0.3/1000ths of an inch thick electroless nickel coating thereon, said electroless nickel coating being selected from the group consisting of nickel phosphide and nickel boride.
Claim 2
Dependent Claim
130 words
In a rechargeable electrical energy storage device including a lithium halide-containing salt electrolyte which is molten at the operating temperature of the device, and electropositive and electronegative electrode structures spaced apart in said electrolyte, the improvement wherein said electropositive electrode structure comprises: a housing for containing a body of electropositive active material, said housing having at least one open face; an electrolyte-permeable member affixed to said housing and covering said open face for retaining said active material in said housing; and said housing and electrolyte-permeable member comprising a material selected from the group consisting of steel, nickel, copper and alloys thereof having at least a 0.3/1000ths of an inch thick electroless nickel coating thereon, said electroless nickel coating being selected from the group consisting of nickel phosphide and nickel boride.
Claim 3
Dependent Claim
18 words
The electrical energy storage device of claim 1 wherein said electrochemically active material is a transition metal chalcogenide.
Claim 4
Dependent Claim
22 words
The electrical energy storage device of claim 1 wherein said electronegative electrode contains an alkali metal alloy for the electrochemically active material.
Claim 5
Dependent Claim
20 words
The electrical energy storage device of claim 3 wherein the alkali metal alloy comprises an alloy of lithium and silicon.
Claim 6
Dependent Claim
21 words
The electrical energy storage device of claim 4 wherein said nickel coating is from 0.5 to 1.0/1000ths of an inch thick.
Claim 7
Dependent Claim
18 words
The electrical energy storage device of claim 1 wherein said electroless nickel coating is a nickel phosphide coating.
Claim 8
Dependent Claim
17 words
The electrical energy storage device of claim 6 wherein said housing and said electrolyte-permeable members are steel.
Claim 9
Dependent Claim
38 words
The electrical energy storage device of claim 6 wherein said housing and electrolyte-permeable member are copper and provided with an electroless nickel phosphide coating in a thickness within the range of from 0.5 to 1.0/1000ths of an inch.
Claim 10
Dependent Claim
35 words
The electrical energy storage device of claim 1 wherein said electronegative electrode structure contains a lithium alloy as the active material and the electropositive electrode structure contains a transition metal chalcogenide as the active material.
Claim 11
Dependent Claim
53 words
The electrical energy storage device of claim 9 wherein the electropositive electrode structure comprises a metal selected from the group consisting of steel, nickel, copper and alloys thereof covered with a substantially uniform coating of electroless nickel and having a coating thickness within the range of from 0.5 to 1.0/1000ths of an inch.
Claim 12
Dependent Claim
16 words
The electrical energy storage device of claim 10 wherein said electroless nickel coating comprises nickel phosphide.
Claim 13
Dependent Claim
16 words
The electrical energy storage device of claim 11 wherein said transition metal chalcogenide is iron sulfide.
Claim 14
Dependent Claim
19 words
The electrical energy storage device of claim 12 wherein the lithium alloy comprises an alloy of lithium and silicon.
Claim 15
Dependent Claim
19 words
The electrical energy storage device of claim 13 wherein the lithium alloy comprises an alloy of lithium and aluminum.
Claim 16
Dependent Claim
28 words
The electrical energy storage device of claim 14 wherein the electroless nickel coating has a thickness within the range of from about 0.6 to 0.7/1000ths of an inch.
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |