Hydrogen storage alloy, hydrogen storage alloy electrode using the hydrogen storage alloy, and nickel-hydrogen secondary battery

摘要

PPROBLEM TO BE SOLVED: To provide a rare earth-Mg-Ni hydrogen storing alloy having high hydrogen equilibrium pressure while keeping alkali resistance and hydrogen storing amount; and a hydrogen storing alloy electrode using the hydrogen storing alloy; and a nickel hydrogen secondary battery having high capacity, long cycle life, and high working voltage. PSOLUTION: The nickel hydrogen secondary battery contains hydrogen storing alloy particles 36 in a negative electrode 26, and the hydrogen storing alloy has a composition represented by general formula: (NdSBa/SBDySBb/SBASBc/SB)SB1-w/SBMgSBw/SBNiSBx/SBAlSBy/SBTSBz/SB. In the formula, A and T each represent at least one element selected from the group comprising La, Pr and the like, and the group comprising V, Nb and the like; subscripts a, b, and c each satisfy the relation represented by a0, b0, c0, a+b+c=1; subscripts w, x, and z each are in the range represented by 0w1, 0.05y0.35, 0z0.5, and 3.2x+y+z3.8. PCOPYRIGHT: (C)2009,JPO&INPIT