| 简介 |
PROBLEM TO BE SOLVED : To provide an alkaline storage battery having excellent discharge characteristics and life characteristics although its negative electrode contains a rare eath-Mg-Ni based hydrogen storage alloy.
SOLUTION : The negative electrode 4 of this alkaline storage battery contains a conductive substrate 20 having a plurality of holes 20a, and hydrogen storage alloy particles 20 formed by applying paste containing material powder of the hydrogen storage alloy to the conductive substrate 20 and applying a rolling treatment to it after drying it and allowed to be retained in the substrate. The arithmetic average roughness Ra of the conductive substrate 20 after the rolling treatment is 3.0 μm or more, and the composition of the hydrogen storage alloy particle 22 is expressed by a general formula : ((PrND)αLn1-α)1-βMgβNiγ-δ-εALδTε. The average particle diameter D50 of the material powder of the hydrogen storage alloy is within a range of not less than 6 μm and not more than 40 μm, and the coefficient of variation σ/D50 obtained by dividing standard deviation σ in the particle size distribution of the material powder of the hydrogen storage alloy by the average particle diameter D50 is not more than 1.5.
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