Electrochemically stabilized cani5 alloys and electrodes

Details Electrochemically stabilized cani5 alloys and electrodes Electrochemically stabilized cani5 alloys and electrodes

H - Electricity

01

M

H01M 4/58 (2006.01) C22C 19/03 (2006.01) H01M 4/02 (2006.01) H01M 4/32 (2006.01) H01M 4/38 (2006.01) H01M 4/52 (2006.01) H01M 10/34 (2006.01)

Patent

CA 2374011

An electrochemically stabilized Ca-Ni hydrogen storage alloy material for use as the active negative electrode material of an alkaline electrochemical cell. The alloy material includes at least one modifier element which stabilizes the alloy material from degradation during electrochemical cycling in an alkaline cell, by protecting calcium within the alloy and preventing dissolution of calcium into the alkaline electrolyte. The alloy has the formula (Ca1-x- yMxNi2y)Ni5-zQz, where M is at least one element selected from the group consisting of misch metal, rare earth metals, zirconium and mixtures of Zr with Ti or V, Q is at least one element selected from the group consisting of Si, Al, Ge, Sn, In, Cu, Zn, Co, and mixtures thereof, x ranges between about o.o2 and o.2, y ranges between about 0.02 and 0.4, and z ranges from about 0.05 to about 1.00.

Cette invention concerne un matériau d'alliage au Ca-Ni à stockage d'hydrogène utilisé comme matériau actif pour électrode négative de pile électrochimique alcaline. Le matériau d'alliage comprend au moins un élément modificateur qui le stabilise contre la dégradation pendant le cycle électrochimique d'une cellule alcaline, protège le calcium de l'alliage et l'empêche de se dissoudre dans l'électrolyte alcaline. La formule de l'alliage est Ca¿1-x-y?M¿x?Ni¿2y?)Ni¿5-z?Q¿z?, dans laquelle M représente au moins un élément pris dans le groupe composé de mischmétal, de métaux de terres rares, de zirconium et de mélanges de Zr avec Ti ou V, Q est au moins un élément pris dans le groupe composé de Si, Al, Ge, Sn, In, Cu, Zn, Co, et de mélanges de ces éléments, x est compris entre 0,02 et 0,2 environ, y est compris entre 0,02 and 0,4 environ et z est compris entre 0,05 et 1,00 environ.

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