B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
B22F 9/02 (2006.01) B22F 1/00 (2006.01) B22F 9/04 (2006.01) C01B 3/00 (2006.01) H01M 4/38 (2006.01) H01M 8/04 (2006.01) H01M 4/02 (2006.01) H01M 10/34 (2006.01)
Patent
CA 2307134
The invention concerns a method for preparing a nanocomposite based on magnesium and another element or compound known to absorb hydrogen and hardly miscible when ground with magnesium or its hydride, such as vanadium, titanium or niobium. The method is characterised in that it consists in submitting magnesium or a compound based on magnesium known to absorb hydrogen to hydrogenation to obtain the corresponding hydride in powder form. Said resulting powder hydride is then mixed with the other element or compound or a hydride of said other element or compound and the resulting mixture is subjected to intense mechanical grinding until the corresponding nanocomposite is obtained in the form of a hydride. Finally, if necessary, the resulting nanocomposite is subjected to hydrogen desorption. The invention also concerns the resulting nanocomposite based on Mg, which has the advantage of being inexpensive and highly efficient for storing hydrogen owing to its microstructure (that is owing to the nature of its interfaces and the spatial distribution of its constituents) which is extremely fine and provides an excellent synergistic effect between Mg and the other element or compound.
Image L'invention vise un procédé de préparation d'un nanocomposite à base de magnésium et d'un autre élément ou composé connu pour absorber l'hydrogène et être peu miscible au broyage avec le magnésium ou son hydrure, tel le vanadium, le titane ou le nobium. Selon ce procédé, on soumet le magnésium ou un composé à base de magnésium connu pour absorber l'hydrogène à une hydrogénation en vue d'obtenir l'hydrure correspondant sous la forme d'une poudre. On mélange alors la poudre d'hydrure ainsi obtenue avec l'autre élément ou composé ou un hydrure de cet autre élément ou composé et on soumet le mélange ainsi obtenu à un broyage mécanique intense jusqu'à obtention du nanocomposite correspondant sous la forme d'un hydrure. Enfin, si requis, on soumet le nanocomposite ainsi obtenu à une désorption d'hydrogène. L'invention vise aussi le nanocomposite à base de Mg ainsi préparé, qui a l'avantage d'être peu coûteux et d'avoir des performances inégalées pour le stockage de l'hydrogène grâce à sa microstructure (c'est-à-dire à la nature des interfaces et à la distribution spatiale de ses composantes) qui est extrêmement fine et donne lieu à un effet de synergie incroyable entre le Mg et l'autre élément ou composé.
Boily Sabin
Huot Jacques
Lalande Guy
Liang Guoxian
Schulz Robert
Hydro-Quebec
Robic
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