The hydrogen storage alloy and an electrode using the same

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PROBLEM TO BE SOLVED : To provide a new rare earth based hydrogen storage alloy which has a Co content lower than that in the conventional one, is excellent in stability at a low temperature and a high temperature, can sufficiently be activated at a reduced charging-discharging cycle, and is suitable as a negative electrode active substance for a low-cost nickel hydrogen storage battery of high output. SOLUTION : In the hydrogen storage alloy containing misch metal including La of 60-90 wt.%, Mg, Ni, Co, Mn and Al, wherein the content of Mg is 2 to 6 atomic% based on the total content of misch metal and Mg, at least one segregated phase is allowed to exist in a matrix phase, and the concentration of Mg in the segregated phase is made higher than that in the matrix phase. COPYRIGHT : (C)2004, JPO&NCIPI