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1. WO2007091894 - ADJUSTING THE STABILITY OF COMPLEX METAL HYDRIDES

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[ EN ]

PATENT CLAIMS

1. A material for reversible hydrogen storage, which
comprises a complex hydride based on one or more anions selected among BH4', MgH3', MH4" and MH63" (M = Al, Ga, In), and one or more cations, where the material has gained
amended stability due to partly substitution of anion-hydrogen with halogen in the complex hydride phase itself.

2. The material according to claim 1, wherein halogen has been chosen among fluorine, chlorine and bromine.

3. The material according to claim 1, wherein the cation or the cations is/are selected among alkali metals, alkaline-earth metals, transition metals, lanthanoids, Al and Ga.

4. The material according to claim 3, wherein the cation or the cations is/are selected among alkali metals, alkaline-earth metals, 3d transition metals and Al.

5. The material according to claim 1, wherein the cation is Li.

6. The material according to any of the claims 1 to 5 , which is substituted from 0,01 til 70%.

7. The material according to any of the claims 1 to 6, which comprises one or more combinations of complex ions or of complex ions and interstitial hydrogen.

8. The material according to any of the claims 1 to 7 , which comprises complex ions that are interconnected, so that total composition and charge differ from the isolated complex ions.

9. A Process for preparation of the material according to any of the claims 1 to 8, which comprises to mix metal halogenide with dehydrogenated product followed by rehydrogenation.

10. Use of the material according to any of the claims 1 to 8 for reversible hydrogen storage in hydrogen storage
systems .

11. Use according to claim 10, wherein the hydrogen storage systems are for vehicles .

12. A process for reversible hydrogen storage, wherein a material is used comprising a complex hydride based on one or more anions selected among BH4", MgH3", MH4" and MH63" (M = Al, Ga, In), and one or more cations, where the stability is amended due to partly substitution of anion-hydrogen with halogen in the complex hydride phase itself.

13. The process according to claim 12, where halogen is selected among fluorine, chlorine and bromine.

14. The process according to claim 12, wherein the cation or cations is/are selected among alkali metals, alkaline-earth metals, transition metals, lanthanoids, Al and Ga.

15. The process according to claim 14, where the cation or cations is/are selected among alkali metal, alkaline-earth metals, 3d transition metals and Al.

16. The process according to claim 12, where Li is used as cation.

17. The process according to any of the claims 12 to 16, where the material being used is substituted from 0,01 to 70%.

18. The process according to any of the claims 12 to 17, where the material being used comprises one or more
combinations of complex ions or of complex iones and
interstitial hydrogen.

19. The process according to any of the claims 12 to 18, where the material being used comprises complex ions that are interconnected so that total composition and charge differ from the isolated complex ions.