| 简介 |
PROBLEM TO BE SOLVED : To provide a novel CaCu5 type hydrogen absorbing alloy containing misch metal (referred to as Mm), in which the content percentages of Nd and Pr in the Mm can be decreased while life characteristics thereof can be maintained.
SOLUTION : In a CaCu5 type hydrogen absorbing alloy, i.e. a hydrogen absorbing alloy having a parent phase of an AB5-type crystal structure, the A site of the AB5 type comprises Mm in which La and Ce occupy 90-100 mass% of the entire Mm, and the B site of the AB5 type comprises any one of Ni, Al, Mn, Co, Fe, Ti, V, Zr and or the like, or a combination of two or more thereof. Crystallite size (by the Lorentzian method) obtained by X-ray diffraction measurement of the hydrogen storage alloy is larger than 466 nm and strain (by the Lorentzian method) is 0.18 or lower.
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