Hydrogen-absorbing alloy, electrode and alkaline secondary battery
AssigneeKabushiki Kaisha Toshiba
InventorsTatsuoki Kohno, Motoya Kanda, Shinji Tsuruta
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Abstract
A hydrogen-absorbing alloy which comprises a first region comprising 50 to 75 mole % of Mg and not more than 50 mole % of Ni, and at least two regions selected from the group consisting of a second region comprising less than 50 mole % (including 0 mole %) of Mg and less than 75 mole % of Ni, a third region comprising not less than 75 mole % of Mg, and a fourth region comprising not less than 75 mole % of Ni.
Claims29
A hydrogen-absorbing alloy which comprises:
- a first region comprising 50 to 75 mole % of Mg, and not more than 50 mole % of Ni;
- and
- at least two regions selected from the group consisting of a second region comprising less than 50 mole % (including 0 mole %) of Mg and less than 75 mole % of Ni, a third region comprising not less than 75 mole % of Mg, and a fourth region comprising not less than 75 mole % of Ni.
A electrode, which comprises a hydrogen-absorbing alloy comprising:
- a first region comprising 50 to 75 mole % of Mg and not more than 50 mole % of Ni;
- and
- at least two regions selected from the group consisting of a second region comprising less than 50 mole % (including 0 mole %) of Mg and less than 75 mole % of Ni, a third region comprising not less than 75 mole % of Mg, and a fourth region comprising not less than 75 mole % of Ni.
An alkaline secondary battery with a negative electrode comprising a hydrogen-absorbing alloy which comprises:
- a first region comprising 50 to 75 mole % of Mg and not more than 50 mole % of Ni;
- and
- at least two regions selected from the group consisting of a second region comprising less than 50 mole % (including 0 mole %) of Mg and less than 75 mole % of Ni, a third region comprising not less than 75 mole % of Mg, and a fourth region comprising not less than 75 mole % of Ni.
Dependencies are inferred from the claim text.