US4340652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ternary compound electrode for lithium cells
Assignee: United States Department of Energy
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Filing: 1980-07-30
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Granted: 1982-07-20
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Expires: 2000-07-30
Abstract
Abstract Lithium-based cells are promising for applications such as electric vehicles and load-leveling for power plants since lithium is very electropositive and of light weight. One type of lithium-based cell utilizes a molten salt electrolyte and normally is operated in the temperature range of about 350 DEG -500 DEG C. Such high temperature operation accelerates corrosion problems. The present invention provides an electrochemical cell in which lithium is the electroactive species. The cell has a positive electrode which includes a ternary compound generally represented as Li-M-O, wherein M is a transition metal. Corrosion of the inventive cell is considerably reduced.
Inventors
- 👤 Ian D. Raistrick
- 👤 Ned A. Godshall
- 👤 Robert A. Huggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:36
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/052; H01M10/36; H01M10/39; H01M10/399; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/485; H01M4/52; H01M4/525; H01M4/13; H01M4/131; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02T; Y02T10/00; Y02T10/60; Y02T10/70
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
63 words
In an electrochemical cell with lithium as the electroactive species thereof, said cell having a positive electrode, a negative electrode and an electrolyte, said electrolyte having a melting point of about 350° C. to about 500° C., the improvement comprising: said positive electrode including a ternary compound represented by Li-M-O wherein Li is lithium, M is a transition metal, and O is oxygen.
Claim 2
Dependent Claim
63 words
In an electrochemical cell with lithium as the electroactive species thereof, said cell having a positive electrode, a negative electrode and an electrolyte, said electrolyte having a melting point of about 350° C. to about 500° C., the improvement comprising: said positive electrode including a ternary compound represented by Li-M-O wherein Li is lithium, M is a transition metal, and O is oxygen.
Claim 3
Dependent Claim
24 words
The electrochemical cell as in claim 1 wherein M of said ternary compound is selected from the group consisting of iron, cobalt and nickel.
Claim 4
Dependent Claim
52 words
In an electrochemical cell with lithium as the electroactive species thereof, said cell having a positive electrode, a negative electrode and an electrolyte, the improvement comprising: said positive electrode having at least one ternary compound in ionic communication with said electrolyte, said at least one ternary compound including lithium, iron and oxygen.
Claim 5
Dependent Claim
52 words
In an electrochemical cell with lithium as the electroactive species thereof, said cell having a positive electrode, a negative electrode and an electrolyte, the improvement comprising: said positive electrode having at least one ternary compound in ionic communication with said electrolyte, said at least one ternary compound including lithium, iron and oxygen.
Claim 6
Dependent Claim
35 words
The electrochemical cell as in claim 3 wherein said at least one ternary compound is a system of compounds including LiFe 5 O 8 , LiFeO 2 , Li 5 FeO 4 and mixtures thereof.
Claim 7
Dependent Claim
52 words
In an electrochemical cell with lithium as the electroactive species thereof, said cell having a positive electrode, a negative electrode and an electrolyte, the improvement comprising: said positive electrode having at least one ternary compound in ionic communication with said electrolyte, said at least one ternary compound including lithium, cobalt and oxygen.
Claim 8
Dependent Claim
52 words
In an electrochemical cell with lithium as the electroactive species thereof, said cell having a positive electrode, a negative electrode and an electrolyte, the improvement comprising: said positive electrode having at least one ternary compound in ionic communication with said electrolyte, said at least one ternary compound including lithium, cobalt and oxygen.
Claim 9
Dependent Claim
23 words
The electrochemical cell as in claim 5 wherein said at least one ternary compound is a system of compounds including LiCoO 2 .
Claim 10
Dependent Claim
52 words
In an electrochemical cell with lithium as the electroactive species thereof, said cell having a positive electrode, a negative electrode and an electrolyte, the improvement comprising: said positive electrode having at least one ternary compound in ionic communication with said electrolyte, said at least one ternary compound including lithium, nickel and oxygen.
Claim 11
Dependent Claim
52 words
In an electrochemical cell with lithium as the electroactive species thereof, said cell having a positive electrode, a negative electrode and an electrolyte, the improvement comprising: said positive electrode having at least one ternary compound in ionic communication with said electrolyte, said at least one ternary compound including lithium, nickel and oxygen.
Claim 12
Dependent Claim
28 words
The electrochemical cell as in claim 7 wherein said at least one ternary compound is a system of compounds including LiNiO 2 and LiNi 4 O 5 .
Claim 13
Dependent Claim
47 words
An electrode comprising: a grid member and outer oxide layer attached to said grid member, said grid member being of a material suitable for collecting and transporting electrons, said layer including a lithium species and another species selected from the group consisting of iron, nickel and cobalt.
Claim 14
Dependent Claim
47 words
An electrode comprising: a grid member and outer oxide layer attached to said grid member, said grid member being of a material suitable for collecting and transporting electrons, said layer including a lithium species and another species selected from the group consisting of iron, nickel and cobalt.
Claim 15
Dependent Claim
18 words
The electrode as in claim 9 wherein said grid member includes iron, nickel, titanium, alloys thereof, or graphite.
Claim 16
Dependent Claim
22 words
The electrode as in claim 9 wherein said layer has a ternary compound therein, said ternary compound including lithium, iron and oxygen.
Claim 17
Dependent Claim
31 words
The electrode as in claim 11 wherein said ternary compound is a system of compounds including LiFe 5 O 8 , LiFeO 2 , Li 5 FeO 4 and mixtures thereof.
Claim 18
Dependent Claim
22 words
The electrode as in claim 9 wherein said layer has a ternary compound therein, said ternary compound including lithium, cobalt and oxygen.
Claim 19
Dependent Claim
19 words
The electrode as in claim 13 wherein said ternary compound is a system of compounds including LiCoO 2 .
Claim 20
Dependent Claim
22 words
The electrode as in claim 9 wherein said layer has a ternary compound therein, said ternary compound including lithium, nickel and oxygen.
Claim 21
Dependent Claim
24 words
The electrode as in claim 15 wherein said ternary compound is a system of compounds including LiNiO 2 and LiNi 4 O 5 .
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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |