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1. (WO2015175640) ALLIAGES DE STOCKAGE D'HYDROGÈNE À PLUSIEURS PHASES
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

Claims

1. A multi-phase hydrogen storage alloy, comprising at least

a hexagonal Ce2Ni7 phase and a hexagonal Pr5Coig phase,

where the Ce2Ni7 phase abundance is > 30 wt% and the Pr5Coig phase abundance is > 8 wt%, based on the total alloy and

where the alloy comprises a mischmetal where Nd in the mischmetal is < 50 at%.

2. An alloy according to claim 1 where the abundance of the Ce2Ni7 phase is from about 30 to about 72 wt%, based on the total alloy and/or where the abundance of the Pr5Co-ig phase is from about 8 to about 30 wt%, based on the total alloy.

3. An alloy according to claims 1 or 2 where the alloy further contains at least one phase selected from the group consisting of hexagonal CeNi3, rhombohedral PuNi3 and rhombohedral CesCoig; or

further contains at least one phase selected from the group consisting of hexagonal MgZn2, hexagonal CeNi3, rhombohedral PuNi3, rhombohedral Pr2Ni7, rhombohedral CesCo-ig and hexagonal CaCus.

4. An alloy according to any of claims 1 to 3 which contains a hexagonal CeNi3 phase and/or a rhombohedral PuNi3 phase, where the combined abundance thereof is from > 0 to about 20 wt%, based on the total alloy.

5. An alloy according to any of claims 1 to 4 comprising a hexagonal MgZn2 phase in an abundance of from 0 to about 2 wt%, a hexagonal CeNi3 phase in an abundance of from about 1 to about 21 wt%, a rhombohedral PuNi3 phase in an abundance of from about 2 to about 10 wt%, a rhombohedral Pr2Ni7 phase in an abundance of from 0 to about 2 wt%, a rhombohedral CesCoig phase in an abundance of from about 3 to about 12 wt% and a hexagonal CaCus phase in an abundance of from 0 to about 16 wt%, based on the total alloy.

6. An alloy according to any of claims 1 to 5 where the mischmetal comprises La, Pr and Nd and/or where the mischmetal contains no Ce.

7. An alloy according to any of claims 1 to 6 comprising from about 17 to about 22 at% mischmetal, from about 3 to about 5 at% Mg, from about 63 to about 81 at% Ni, from about 2 to about 6 at% Al and from 0 to about 4 at% of one or more elements selected from the group consisting of B, Co, Cu, Fe, Cr, Mn, Zn, Si and Zr.

8. An alloy according to any of claims 1 to 7 comprising Mg and Ni; or comprising

i) a mischmetal and Mg and

ii) Ni and one or more elements selected from the group consisting of B, Co, Cu, Fe, Cr, Mn, Zn, Si and Zr,

where the ii) to i) atomic ratio is from about 3.1 to about 3.6.

9. A multi-phase hydrogen storage alloy, comprising

one or more rare earth elements, a hexagonal Ce2Ni7 phase and a hexagonal Pr5Coig phase,

where the Ce2Ni7 phase abundance is from about 30 to about 72 wt% and the Pr5Coig phase abundance is > 8 wt%, based on the total alloy.

10. An alloy according to claim 9 where the abundance of the Ce2Ni7 phase is from about 30 to about 71 wt% and the abundance of the Pr5Coig phase is from about 8 to about 30 wt%, based on the total alloy.

11. An alloy according to claims 9 or 10 where the alloy further contains at least one phase selected from the group consisting of hexagonal CeNi3, rhombohedral PuNi3 and rhombohedral CesCoig.

12. An alloy according to any fo claims 9 to 11 which contains a hexagonal CeNi3 phase and/or a rhombohedral PuNi3 phase, where the combined abundance is from > 0 to about 20 wt%, based on the total alloy.

13. An alloy according to any of claims 9 to 12 comprising a hexagonal MgZn2 phase in an abundance of from 0 to about 2 wt%, a hexagonal CeNi3 phase in an abundance of from about 1 to about 21 wt%, a rhombohedral PuNi3 phase in an abundance of from about 2 to about 10 wt%, a rhombohedral Pr2Ni7 phase in an abundance of from 0 to about 2 wt%, a rhombohedral CesCoig phase in an abundance of from about 3 to about 12 wt% and a hexagonal CaCus phase in an abundance of from 0 to about 16 wt%, based on the total alloy.

14. An alloy according to any of claims 9 to 13 comprising one or more rare earth elements, Mg and Ni.

15. A metal hydride battery, an alkaline fuel cell or a metal hydride air battery comprising an electrode comprising the hydrogen storage alloy according to any of claims 1 to 14.