US4139680A
Expired / Lapsed
US
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Method for preventing dendritic growth in secondary cells
Assignee: Duracell Inc USA
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Filing: 1977-03-09
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Granted: 1979-02-13
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Expires: 1997-03-09
Abstract
Abstract A high conductivity stable clovoborate electrolyte salt is used in alkali and alkaline earth metal non-aqueous secondary cells to prevent dendritic formation of the plated alkali or alkaline earth metal.
Inventors
- 👤 Carl R. Schlaikjer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:09
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/06; C01B35/08; C01B35/10; C01B6/00; H; H01; H01M; H01M10/00; H01M10/05; H01M10/056; H01M10/0561; H01M10/0563; H01M6/00; H01M6/14; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
73 words
A method for preventing dendrite formation in a rechargeable electrochemical cell having an anode comprising at least one metal which is subject to dendrite formation upon charging of said cell, a non-aqueous electrolyte solvent, and a cathode; comprising the steps of dissolving in said solvent an electrolyte salt having a metal cation and a clovoborate anion and charging said cell while in the discharged state whereby said electrolyte salt prevents said dendrite formation.
Claim 2
Independent Claim
73 words
A method for preventing dendrite formation in a rechargeable electrochemical cell having an anode comprising at least one metal which is subject to dendrite formation upon charging of said cell, a non-aqueous electrolyte solvent, and a cathode; comprising the steps of dissolving in said solvent an electrolyte salt having a metal cation and a clovoborate anion and charging said cell while in the discharged state whereby said electrolyte salt prevents said dendrite formation.
Claim 3
Dependent Claim
59 words
The method of claim 1 wherein said clovoborate anion has a formula (B m X n ) -k wherein m, n and k are integers with m ranging from 6-20, n ranging from 6-18 and k ranging from 1-4, B is boron, and X is selected from the group consisting of H,F, Cl, Br, I, OH and combinations thereof.
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein said clovoborate anion has the formula (B 10 Cl 10 ) -- .
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein said non-aqueous electrolyte solvent is inorganic.
Claim 6
Dependent Claim
21 words
The method of claim 4 wherein said inorganic solvent is selected from the group consisting of sulfur dioxide and thionyl chloride.
Claim 7
Dependent Claim
14 words
The method of claim 1 wherein said metal subject to dendrite formation is lithium.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein said metal subject to dendrite formation is lithium.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein said metal subject to dendrite formation is sodium.
Claim 10
Dependent Claim
23 words
The method of claim 1 wherein said metal cation is the same metal as that of at least one metal of said anode.
Claim 11
Dependent Claim
14 words
The method of claim 7 wherein said metal of said metal cation is lithium.
Claim 12
Dependent Claim
19 words
The method of claim 10 wherein said electrolyte salt has the formula Li 2 B 10 Cl 10 .
Claim 13
Dependent Claim
19 words
The method of claim 8 wherein said electrolyte salt has the formula Na 2 B 10 Cl 10 .
Claim 14
Dependent Claim
26 words
The method of claim 1 wherein said metal is selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium and barium.
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) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |