Patent ID: 8318349
Filing Date: 2012-11-27
Classification: C22C,H01M,Y02E

Abstract:
1. A negative electrode active material for a nickel-metal hydride battery comprising a hydrogen storage alloy, the hydrogen storage alloy containing La, Mg, Ni, Co, Al, and element M, wherein a molar ratio x of Mg to the total of La and Mg is 0.01≦x≦0.5, a molar ratio y of Ni to the total of La and Mg is 2≦y≦3, a molar ratio z of Co to the total of La and Mg is 0.25≦z≦0.75, a molar ratio α of Al to the total of La and Mg is 0.01≦α≦0.05, element M represents at least one selected from the group consisting of Y and Sn, and a content of element M is 0.4 wt % or less of said hydrogen storage alloy.