Centrifugally atomized zinc alloy powder for alkaline batteries

Details Centrifugally atomized zinc alloy powder for alkaline batteries Centrifugally atomized zinc alloy powder for alkaline batteries

H - Electricity

01

M

H01M 4/42 (2006.01) B22F 9/10 (2006.01) C22C 1/04 (2006.01)

Patent

CA 2359121

This invention relates to centrifugal atomized zinc alloy powders for alkaline batteries consisting of (a) 0.005-2 % by weight of indium, and 0.005-0.2 % by weight of either one of Al and Bi, or (b) 0.005-2 % by weight of indium, and 0.005-0.2 % by weight of Bi, and 0.001-0.5 % of either one or both of Al and Ca, or (c) 0.005-2 % by weight of either one or both of Bi and Al, and 0-0.5 % by weight of Pb, the remainder being zinc. The powder is obtained by centrifugal atomisation in a protective atmosphere, where the oxygen content is less than 4 % by volume. The resistance to corrosion in the electrolyte of the battery, especially after partial discharge, is markedly better than when the same alloys are prepared by the traditional production process. The capacity of batteries containing these powders is very good.

Cette invention a trait à des poudres d'alliage de zinc pulvérisées par centrifugation pour piles alcalines constituées, (a), de 0.005-2 % en poids d'indium et de 0.005-0.2 % en poids de Al ou de Bi ou bien, (b), de 0.005-2 % en poids d'indium, de 0.005-0.2 % en poids de Bi et de 0.001-0.5 % de Al ou de Ca ou des deux ou, (c), de 0.005-2 % de Bi ou de Al ou des deux ainsi que de 0-0.5 % de Pb, le reste étant du zinc. On produit cette poudre par pulvérisation par centrifugation dans une atmosphère protectrice dans laquelle la teneur en oxygène est inférieure à 4 % en volume. La résistance à la corrosion dans l'électrolyte de la pile, notamment après une décharge partielle, est notablement supérieure à celle d'alliages produits de manière classique. La capacité des piles contenant ces poudres est excellente.

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