Hydrogen storage alloy, hydrogen storage alloy electrode, secondary battery, and method for producing hydrogen storage alloy
AssigneesGS Yuasa International Ltd., National Institute of Advanced Industrial Science and Technology
InventorsTadashi Kakeya, Manabu Kanemoto, Minoru Kuzuhara, Tetsuya Ozaki, Masaharu Watada, Tetsuo Sakai
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Abstract
Provided is a hydrogen storage alloy which is characterized in that two or more crystal phases having different crystal structures are layered in a c-axis direction of the crystal structures. The hydrogen storage alloy is further characterized in that a difference between a maximum value and a minimum value of a lattice constant a in the crystal structures of the laminated two or more crystal phases is 0.03 Å or less.
Claims4
A hydrogen storage alloy containing two or more crystal phases having different crystal structures, wherein the two or more crystal phases are layered in the c-axis direction of the crystal structures, and the hydrogen storage alloy has, as a main produced phase, a crystal phase having Ce5Co19 type crystal structure and a composition defined by a general formula LahR6iR7jMgkR8m, wherein R6 is one or more elements selected from the group consisting of rare earth metals including Y and excluding La, wherein R7 is one or more elements selected from the group consisting of Zr, Ti, Zn, and V, wherein R8 is one or more elements selected from the group consisting of Ni, Co, Mn, Al, Cu, Fe, Cr, and Si, and wherein h, j, k and m satisfy 2.6≦i≦5.1;
- 0.2≦j≦0.65;
- 2≦k≦5.5;
- 0.70≦h/(h+i)≦0.85;
- and h+i+j+k+m=100.
Dependencies are inferred from the claim text.