Electrochemically stabilized CaNi5 alloys and electrodes
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United States of America Patent
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Feb 25, 2003
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app pub date -
May 19, 1999
filing date -
May 19, 1999
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Abstract
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 (Ca.sub.1-x-y M.sub.x Ni.sub.2y)Ni.sub.5-z Q.sub.z, 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 form the group consisting of Si, Al, Ge, Sn, In, Cu, Zn, Co, and mixtures thereof, x ranges between about 0.02 and 0.2, y ranges between about 0.02 and 0.4, and z ranges from about 0.05 to about 1.00.
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