Abstract: A hydrogen storage alloy that is used for an alkaline storage battery, and that has a main phase combining crystal structures of an A2B7-type structure, an A5B19-type structure, or an AB3-type structure and is represented by General Formula (1): (La1-a-bYaRb)1-cMgcNidAleCrfFeg (where R and the suffixes a, b, c, d, e, f, and g are as follows: R is one or both of Sm and Ce, 0<a?0.12, 0?b?0.12, 0.13?c?0.27, 3.20?d+e+f+g?3.75, 0?e?0.14, 0?f?0.05, and 0?g?5 0.35); an alkaline storage battery that uses this alloy for a negative electrode; and a vehicle that has this alkaline storage battery as a source of electricity to be supplied to a motor.

Abstract: The present disclosure provides a negative electrode active material for a nickel-metal hydride battery containing a hydrogen-absorbing alloy that contains Ti, Zr, Cr, Mn, and Ni, and further contains one or more elements selected from the group consisting of La and Ce, wherein a total content proportion of the one or more elements selected from the group consisting of La and Ce based on the entire hydrogen-absorbing alloy is 8 at % or less, and a method for producing the same.

Abstract: A production method for a negative electrode active material in the present disclosure includes: obtaining a thin piece by cooling molten metal of a hydrogen absorbing alloy containing Ti, Zr, Cr, Mn, and Ni, at a speed of 1×102° C./second to 1×104° C./second, at least to lower than 500° C.; and performing heat treatment of the thin piece at 500° C. to 900° C. for 1 hour to 10 hours in a vacuum or an inert gas atmosphere. The negative electrode active material obtained by the production method includes hydrogen absorbing alloy including a plurality of main phases and a grain boundary phase that exists between mutually adjacent main phases of the main phases, each of the main phases include an AB2 alloy phase, the grain boundary phase includes an AB alloy phase, and the average distance between the mutually adjacent main phases is 1.0 ?m or less.

Abstract: A hydrogen absorbing alloy suitable for a negative electrode of an alkaline storage battery is used for an alkaline storage battery, and this hydrogen absorbing alloy is an alloy that is composed mainly of crystal phases of an A5B19 phase and an A2B7 phase and is represented by the following General Formula (A): (La1-a-bCeaSmb)1-cMgcNidMeTf??(A), where M, T, and suffixes a, b, c, d, e, and f in Formula (A) meet the following conditions: M: at least one element selected from Al, Zn, Sn, and Si; T: at least one element selected from Cr, Mo, and V; 0<a?0.10; 0?b<0.15; 0.08?c?0.24; 0.03?e?0.14; 0?f?0.05; and 3.55?d+e+f?3.80.

Abstract: A hydrogen storage alloy suitable for a negative electrode of an on-board alkaline storage battery, an alkaline storage battery using this hydrogen storage alloy, and a vehicle; wherein a fine-grained hydrogen storage alloy is used for an alkaline storage battery that has a crystal structure of an A2B7-type structure as a main phase and is represented by a general formula: (La1-aSma)1-bMgbNicAldCre (where suffixes a, b, c, d, and e meet the following conditions: 0?a?0.35, 0.15?b?0.30, 0.02?d?0.10, 0?e?0.10, 3.20?c+d+e?3.50, and 0<a+e), and an alkaline storage battery using this hydrogen storage alloy for a negative electrode. A vehicle also includes this alkaline storage battery as an electricity supply source for a motor.

Abstract: A hydrogen storage alloy suitable for a negative electrode of an alkaline storage battery is provided. The hydrogen storage alloy provided is a hydrogen storage alloy used for an alkaline storage battery that has, as a main phase, one or two crystal structures selected from an A2B7-type structure and an AB3-type structure, and that is represented by a general formula: (La1?a?bCeaSmb)1?cMgcNidAleCrf (where suffixes a, b, c, d, e, and f in this formula (1) meet the following conditions: 0<a?0.15; 0?b?0.15; 0.17?c?0.32; 0.02?e?0.10; 0?f?0.05; and 2.95?d+e+f?3.50.

Abstract: A hydrogen storage alloy suitable for a negative electrode of an alkaline storage battery is provided. The hydrogen storage alloy provided is a hydrogen storage alloy used for an alkaline storage battery that has, as a main phase, one or two crystal structures selected from an A2B7-type structure and an AB3-type structure, and that is represented by a general formula: (La1-a-bCeaSmb)1-cMgcNidAleCrf (where suffixes a, b, c, d, e, and f in this formula (1) meet the following conditions: 0<a?0.15; 0?b?0.15; 0.17?c?0.32; 0.02?e?0.10; 0?f?0.05; and 2.95?d+e+f?3.50.

Abstract: A hydrogen storage alloy suitable for a negative electrode of an on-board alkaline storage battery, an alkaline storage battery using this hydrogen storage alloy, and a vehicle; wherein a fine-grained hydrogen storage alloy is used for an alkaline storage battery that has a crystal structure of an A2B7-type structure as a main phase and is represented by a general formula: (La1-aSma)1-bMgbNicAldCre (where suffixes a, b, c, d, and e meet the following conditions: 0?a?0.35, 0.15?b?0.30, 0.02?d?0.10, 0?e?0.10, 3.20?c+d+e?3.50, and 0<a+e), and an alkaline storage battery using this hydrogen storage alloy for a negative electrode. A vehicle also includes this alkaline storage battery as an electricity supply source for a motor.