Zinc alloy powder for alkaline cell and method to produce...

Details Zinc alloy powder for alkaline cell and method to produce... Zinc alloy powder for alkaline cell and method to produce...

C - Chemistry, Metallurgy

22

C

C22C 18/04 (2006.01) H01M 4/42 (2006.01)

Patent

CA 2080762

A non-amalgamated zinc alloy powder for use in an alkaline cell which consists essentially of an elemental component selected from among the following compositions (1) to (4); (1) 0.001 to 0.5 % by weight of aluminum and 0.01 to 0.5 % by weight of bismuth, (2) 0.001 to 0.5 % by weight of aluminum, 0.01 to 0.5 % by weight of bismuth and not more than 1.0 % by weight of indium, (3) 0.001 to 0.5% by weight of aluminum, 0.01 to 0.5 % by weight of bismuth and not more than 0.5 % by weight of lithium, and (4) 0.001 to 0.5 % by weight of aluminum, 0.01 to 0.5 % by weight of bismuth, not more than 1.0 % by weight of indium, and not more than 0.5 % by weight of calcium or not more than 0.5 % by weight of lithium; and the balance being zinc and containing iron as an inevitably accidental impurity in an amount of not more than 1 ppm; and which can greatly suppress the evolution of hydrogen gas and maintain the discharge performance on a practical level: and a method to produce the same.

Divulgation d'une poudre d'alliage de zinc non amalgamée devant être utilisée dans des piles alcalines, comprenant principalement une composante élémentaire choisie parmi les compositions suivantes (1) à (4); (1) de 0,001 à 0,5 %, en poids, d'aluminium et de 0,01 à 0,5 %, en poids, de bismuth; (2) de 0,001 à 0,5 %, en poids, d'aluminium, de 0,01 à 0,5 %, en poids, de bismuth et moins de 1,0 %, en poids, d'indium; (3) de 0,001 à 0,5 %, en poids, d'aluminium, de 0,01 à 0,5 %, en poids, de bismuth et moins de 0,5 %, en poids, de lithium; et (4) de 0,001 à 0,5 %, en poids, d'aluminium, de 0,01 à 0,5 %, en poids, de bismuth, au plus 1,0 %, en poids, d'indium, au plus 0,5 %, en poids, de calcium ou au plus 0,5 %, en poids, de lithium; le restant de ces compositions étant du zinc et des impuretés inévitables de fer, à une teneur inférieure à 1 ppm. Ces compositions peuvent pratiquement éliminer la production d'hydrogène gazeux et maintenir la performance de décharge à un niveau pratique. On divulgue aussi une méthode pour produire ces compositions.

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