| 简介 |
PROBLEM TO BE SOLVED : To suppress the raw material cost of a Mm-containing CaCu5 type hydrogen-absorbable alloy while maintaining the life property of a negative electrode including the Mm-containing CaCu5 type hydrogen-absorbable alloy as an active material.
SOLUTION : A hydrogen-absorbable alloy according to the present invention comprises : a matrix phase of CaCu5 type crystal structure. The matrix phase is expressed by : MmNiaMnbAlcCod (where Mm is a misch metal; 3.45≤a≤4.40, 0.30≤b≤0.50, 0.20≤c≤0.50, 0.15≤d≤0.80, and 4.90≤a+b+c+d≤5.40). In the misch metal Mm, a combination of La and Ce accounts for a percentage within a range of 90-100 mass% to the total mass of Mm. As to the hydrogen-absorbable alloy, a crystallite size determined from X-ray diffraction measurement according to Lorentzian method is within a range of over 466Å to 1954Å; and a strain determined by Lorentzian method is 0.18% or less.
SELECTED DRAWING : None
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