NICKEL HYDROGEN STORAGE BATTERY

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PROBLEM TO BE SOLVED : To improve a charge/discharge property at high temperatures in a nickel hydrogen storage battery, specifically, to obtain an excellent charge/discharge property at high temperatures after repeated charging/discharging. SOLUTION : In an alkaline storage battery having a positive electrode 1, a negative electrode 2, and an alkaline electrolytic solution, the negative electrode 2 uses a hydrogen storing alloy expressed by a general formula of Ln1-xMgxNia-b-cAlbZc(in the formula, Ln is at least one element selected from a rare-earth element including Y and Zr; Z is at least one element selected from V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Ga, Zn, Sn, In, Cu, Si, P, and B; 0.05≤x≤0.15, 2.8≤a≤3.9, 0.05≤b≤0.30, 0.05≤c≤0.25), and also the positive electrode 1 includes nickel hydroxide particles at which coating layers of high-order cobalt containing alkaline metals are formed, and a compound of at least one element selected from Ca, Sr, Sc, Y, lanthanoid and Bi. COPYRIGHT : (C)2006, JPO&NCIPI