Rechargeable alkaline electrochemical cell

Details Rechargeable alkaline electrochemical cell Rechargeable alkaline electrochemical cell

H - Electricity

01

M

H01M 10/24 (2006.01) H01M 10/26 (2006.01)

Patent

CA 2187984

This invention pertains to rechargeable zinc alkaline electrochemical cells. In cells of the invention, the anode current collector comprises copper, and from about 0.5% by weight to about 11% silicon. Preferred compositions for the anode current collector comprise from about 1% by weight silicon to about 6% by weight silicon. Cells embodying anode current collectors of the invention exhibit reduced current flow under anode polarization in alkaline conditions, and reduced cell expansion under abusive electrical drain conditions. The cells are less susceptible to oxidation of the anode current collector, which is typically irreversible, than known brass anode current collectors. In general, cells of the invention are less susceptible to, and generally do not exhibit as much, irreversible chemical reaction activity, as conventional current collectors, especially oxidation of copper at the anode current collector.

Piles alcalines au zinc rechargeables. Dans ces piles, le collecteur de courant anodique renferme du cuivre et environ 0,5 à 11 % en poids de silicium. Pour le collecteur, on privilégie les compositions contenant environ 1 à 6 % en poids de silicium. Les piles incorporant ces collecteurs présentent un flux de courant moindre sous polarisation anodique dans des conditions alcalines, et une expansion cellulaire réduite en cas de drainage électrique excessif. Les piles sont moins sensibles à l'oxydation du collecteur de courant anodique, généralement irréversible, que les collecteurs de courant anodique connus à base de laiton. De façon générale, les piles de l'invention sont moins sensibles aux réactions chimiques irréversibles et manifestent moins d'activité de cette nature, comparativement aux collecteurs classiques, particulièrement en ce qui concerne l'oxydation du cuivre au collecteur de courant anodique.

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