| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the hydrogen release action of a hydrogen storage alloy since, in the case when the conventional AB<SB POS="POST">5</SB>type rare earth-based alloy represented by LaNi<SB POS="POST">5</SB>or MmNi<SB POS="POST">5</SB>of a CaCu<SB POS="POST">5</SB>type crystal structure is used as the electrode of a nickel-hydrogen storage battery, discharge capacity when a discharge current is increased is easy to be reduced, and to improve rate properties of a secondary battery using the hydrogen storage alloy. <P>SOLUTION: The hydrogen storage alloy has a chemical composition represented by general formula R1<SB POS="POST">v</SB>Ti<SB POS="POST">x</SB>R2<SB POS="POST">y</SB>R3<SB POS="POST">z</SB>(wherein, 0<v, 1≤x≤5, 2≤y≤4.5, 75≤z≤83, v+x+y+z=100 are satisfied; R1 denotes rare earth elements including Y; R2 denotes alkaline-earth metals; and R3 denotes one or more kinds of elements selected from the group composed of Ni, Co, Mn, Al, Cu, Fe, Cr and Si), has a TiNi<SB POS="POST">3</SB>phase or a Ti(NiCo)<SB POS="POST">3</SB>phase, and also has an R1R3<SB POS="POST">5</SB>phase composed of a CaCu<SB POS="POST">5</SB>type crystal structure and an (R1<SB POS="POST">a</SB>Ti<SB POS="POST">b</SB>R2<SB POS="POST">c</SB>)R3<SB POS="POST">3</SB>phase composed of a PuNi<SB POS="POST">3</SB>type crystal structure (wherein, a>0, b>0, c>0, and a+b+c=1). <P>COPYRIGHT: (C)2013,JPO&INPIT |
