Claims
- 1. A nickel zinc alkaline cell having a zinc oxide negative electrode supported on a conductive substrate, an alkaline electrolyte, and a positive electrode having nickel hydroxide supported on a conductive substrate;wherein said positive electrode further comprises 0.01% to 1% by weight of a fluoride salt and a conductivity enhancement additive selected from the group consisting of nickel metal powder, cobalt metal powder, and mixtures thereof; and wherein said fluoride salt is a salt of a metal selected from the group consisting of: potassium, sodium, lithium, rubidium, caesium, a group II metal, a group III metal, a d-block transition metal, an f-block lanthanide, and mixtures thereof.
- 2. The nickel zinc alkaline cell of claim 1, wherein said fluoride salt is potassium fluoride.
- 3. The nickel zinc alkaline cell of claim 2, wherein said alkaline electrolyte comprises a mixture of sodium hydroxide, potassium hydroxide, lithium hydroxide, and an acid selected from the group consisting of: boric acid, phosphoric acid, and mixtures thereof,wherein when boric acid is present, it has a concentration of 0.6 to 1.3 moles per litre; wherein the stoichiometric excess of alkali hydroxide is between 2.0 mole and 4.0 moles; and wherein the electrolyte contains lithium hydroxide.
- 4. The nickel zinc alkaline cell of claim 2, wherein said fluoride salt is potassium fluoride in the amount of 0.1% by weight of said nickel hydroxide.
- 5. The nickel zinc alkaline cell of claim 1, wherein said alkaline electrolyte comprises a mixture of sodium hydroxide, potassium hydroxide, lithium hydroxide, and an acid selected from the group consisting of: boric acid, phosphoric acid, and mixtures thereof;wherein when boric acid is present, it has a concentration of 0.6 to 1.3 moles per litre; wherein the stoichiometric excess of alkali hydroxide is between 2.0 mole and 4.0 moles; and wherein the electrolyte contains lithium hydroxide.
- 6. The nickel zinc cell of claim 1, wherein said alkaline electrolyte comprises boric acid, phosphoric acid, or a mixture thereof.
- 7. The nickel zinc cell of claim 1, wherein said electrolyte comprises boric acid in concentration of 0.6 to 1.3 moles per litre.
- 8. The nickel zinc cell of claim 1, wherein said alkaline electrolyte comprises lithium hydroxide.
- 9. The nickel zinc cell of claim 1, wherein the negative electrode comprises bismuth
Parent Case Info
This application claims benefit of provisional application Ser. No. 60/276,291 filed Mar. 15, 2001.
US Referenced Citations (12)
Foreign Referenced Citations (8)
Number |
Date |
Country |
0833397 |
Apr 1976 |
EP |
0457354 |
Nov 1991 |
EP |
0697746 |
Feb 1996 |
EP |
52-25240 |
Feb 1977 |
JP |
52908540 |
Nov 1993 |
JP |
11007949 |
Jan 1999 |
JP |
11-345613 |
Dec 1999 |
JP |
2000-173614 |
Jun 2000 |
JP |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/276291 |
Mar 2001 |
US |