Hydrogen storage alloy and alkaline storage battery employing hydrogen storage alloy as negative ele

文件类型：PDF文档
文件大小：376K
A hydrogen storage alloy of the present invention includes component A including a rare earth element represented by Ln and magnesium and component B including elements containing at least nickel and aluminum, wherein a primary alloy phase of a hydrogen storage alloy represents an A 5 B 19 type structure; a general formula is represented as Ln 1-x Mg x Ni y-a-b Al a M b (wherein M represents at least one element selected from Co, Mn, and Zn; and 0.1 ‰¤ x ‰¤ 0.2, 3.6 ‰¤ y ‰¤ 3.9, 0.1 ‰¤ a ‰¤ 0.2, and 0 ‰¤ b ‰¤ 0.1); a rare earth element Ln includes maximally two elements containing at least La; and absorption hydrogen equilibrium pressure (Pa) is 0.03-0.17 MPa when the hydrogen amount absorbed in the hydrogen storage alloy (H/M (atomic ratio)) at 40°C is 0.5.