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Nickel hydroxide positive electrode material exhibiting improved conductivity and engineered activation energy
| Details |
Inventors: Ovshinsky, Stanford R.; Venkatesan, Srinivasan; Aladjov, Boyko; Dhar, Subhash; Young, Rosa;
Assignee: Ovonic Battery Company (Troy, MI)
Primary Examiner: Nuzzolillo; Maria
Assistant Examiner: Chaney; Carol
Attorney, Agent or Firm: Schlazer; Philip H., Siskind; Marvin S., Schumaker; David W.
A positive electrode active material mixture comprising: a nickel hydroxide material, and an additive material comprising at least one element selected from the group consisting of calcium cobalt oxide, calcium titanium oxide, calcium molybdenum oxide, lithium cobalt oxide, and mixtures thereof. A nickel positive electrode comprising this active material mixture. A nickel-based, alkaline electrochemical cell comprising this positive electrode. |
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DETAILED DESCRIPTION OF THE INVENTION Disclosed herein is a positive electrode active material mixture for use in a paste for fabricating positive electrodes.
The active material mixture comprises a nickel hydroxide material and an additive material.
The additive material is one or more materials selected from the group consisting of calcium cobalt oxide, calcium titanium oxide, calcium molybdenum oxide, and lithium cobalt oxide.
Mixtures of calcium cobalt oxide, calcium titanium oxide, calcium molybdenum oxide, and lithium cobalt oxide may also be used.
In a first embodiment, the additive is calcium cobalt oxide.
In a second embodiment, the additive is calcium titanium oxide.
In a third embodiment the additive is calcium molybdenum oxide.
In a fourth embodiment, the additive is lithium cobalt oxide.
Preferably, the additive is calcium molybdenum oxide.
Preferably, the additive is between about 1% and 10% by weight of the positive electrode material.
More preferably, the additive is between about 2% and 6% by weight of the positive electrode material.
Most preferably, the additive is about 3% by weight of the positive electrode material.
The nickel hydroxide material may be any nickel hydroxide material known in the art.
It is within the spirit and intent of this invention that any and all kinds of nickel hyroxide materials may be used.
Examples of possible nickel hydroxide materials are provided in U.
S.
Pat.
Nos.
5,348,822 and 5,637,423, the contents of which are incorporated by reference herein.
Also disclosed herein is a nickel positive electrode for use in an alkaline electrochemical cell.
The nickel positive electrode comprises the active material mixture described above.
An electrically conductive substrate is used as a support for the active material.
The additive materials are mixed with the nickel hydroxide material.
Preferably, a binder, such as polyvinyl alcohol, is also added to the mixture to form a paste.
The paste is affixed to the electrically conductive substrate to form an electrode
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***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST*** *** NO IMAGES AVAILABLE***
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