| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost hydrogen storage alloy particle configured to improve productivity and discharge capacity, an electrode for an alkaline storage battery having the hydrogen storage alloy particle, and the alkaline storage battery having the electrode.SOLUTION: A hydrogen storage alloy particle is obtained by an alloy which includes a main phase having a body-centered cubic structure and a grain boundary phase including Ti and Ni. A scanning electron microscope observation image is obtained by describing a circle having a diameter of an average grain size Dof the hydrogen storage alloy particle obtained from the alloy on the whole of a scanning electron microscope observation image of the alloy to be obtained before storing hydrogen. When the number of intersections between the grain boundary phase appearing on the scanning electron microscope observation image and the circle is X, and when the number of the circles described on the scanning electron microscope observation image is Y, X/Y≥2.7 is satisfied. The average grain size Dof the hydrogen storage alloy particle is 84 μm or more. An electrode for an alkaline storage battery includes the hydrogen storage alloy. The alkaline storage battery includes the electrode and an alkaline electrolyte. |
