Hydrogen storage alloy
AssigneeMitsui Kinzoku Company, Limited
InventorsKeisuke Miyanohara, Kyohei Yamaguchi
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Abstract
An ABs-type hydrogen storage alloy is provided that has a low Co amount and uses Mm composed of La and Ce, which is capable of preventing a decrease in lifetime characteristics. The hydrogen storage alloy has an ABx composition constituted with an A-site composed of an Mm and a B-site composed of Ni, Co, Mn, and Al, or Ni, Mn, and Al, wherein Mm is composed of La and Ce; the molar ratio of Co is 0.0 or more and 0.11 or less when the molar ratio of Mm is 1.00; the ratio (Al/Mn) of the molar ratio of Al to the molar ratio of Mn is 0.35 to 1.10; and the ratio of the c-axis length to the a-axis length in the CaCu5-type crystal structure is 0.8092 or more.
Claims6
A hydrogen storage alloy comprising a parent phase having a CaCu5-type, that is, an AB5-type crystal structure, the hydrogen storage alloy comprising an ABx composition constituted with an A-site consisting of a misch metal (referred to as “Mm”) and a B-site consisting of Ni, Co, Mn, and Al, or Ni, Mn, and Al,
- wherein Mm consists of La and Ce;
- a molar ratio of Co is 0.0 or more and 0.11 or less when a molar ratio of Mm is 1.00;
- a ratio (Al/Mn) of a molar ratio of Al to a molar ratio of Mn is 0.35 to 1.10;
- a ratio of a c-axis length to an a-axis length in the CaCu5-type crystal structure is 0.8092 or more;
- and
- the hydrogen storage alloy is allowed to contain impurities at an amount of 0.05% by mass or less.
Dependencies are inferred from the claim text.