Hydrogen storage alloy, method for preparing the same, hydrogen storage alloy electrode, and nickel-hydrogen battery

摘要

PROBLEM TO BE SOLVED: To provide a hydrogen storage alloy having a high electrochemical capacity and an excellent cycle life, a method for preparing the same, a hydrogen storage alloy electrode using a hydrogen storage alloy as an active substance, and a nickel hydrogen battery. SOLUTION: (LaaRb)1-mMgmNixMy, R is one or several of rare earth elements, Ca, Ti, Zr, Hf, and Nb, and M is Al, Fe, Co, Mn, Zn, One or several kinds of V, Cr, Cu, Mo, and W, and a, b, m, x, and y are a0, b≧0, 0m≦0.3, 0≦y≦. The maximum peak intensity (IA) of 2θ=24° to 35° when X-ray diffraction measurement (Cu-Kα ray) is performed, satisfying the conditions of 1.6 and 3.0≦x+y≦4.15. And the intensity ratio (IA/IB) of the maximum peak intensity (IB) of 2θ=38° to 45° is 0.5 or less. [Selection diagram] Figure 2