ALKALINE STORAGE BATTERY

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PROBLEM TO BE SOLVED : To provide an alkaline storage battery having excellent initial output characteristics and high endurance so that the output drop during enduring can be inhibited. SOLUTION : An alkaline storage battery 10 in accordance with an embodiment of the present invention comprises an electrode group comprising a negative electrode 12 containing a hydrogen absorbing alloy as a negative electrode active material, a positive electrode 11 containing nickel hydroxide as a main positive electrode active material, and a separator 13 separating the negative electrode and the positive electrode, and an alkaline electrolytic solution in an outer can 16. The hydrogen absorbing alloy is represented by the formula : Lnl-xMgxNiy-a-bAlaMb, where Ln represents at least one kind of element selected from rare earth elements including Y, and Zr and Ti, M represents at least one kind of element selected from V, Nb, Ta, Cr, Mo, Fe, Ga, Zn, Sn, In, Cu, Si, P, and B, 0.05≤x≤0.30, 0.05≤a≤0.30, 0≤b≤0.50, and 2.8≤y≤3.9. The positive electrode 11 contains niobium (Nb). COPYRIGHT : (C)2013, JPO&INPIT