Cyclic process for wet-chemically producing lithium metal...

C - Chemistry – Metallurgy – 01 – B

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C01B 25/08 (2006.01) C01B 25/00 (2006.01) C01B 25/37 (2006.01) C01B 25/45 (2006.01)

Patent

CA 2599481

The invention relates to a method for producing lithium metal phosphates of a formula LiMPO4, wherein M is at least one type of bivalent metal, preferably selected from the first transition metal range. The inventive method consists in reacting a lithium phosphate with a metal salt and an acid phosphate source in a polar solvent for converting into a corresponding M-containing phosphate, in adding a basic lithium source for obtaining a precursor mixture for a desired lithium metal phosphate, in converting and separating the thus obtained mixture, preferably in hydrothermal conditions, in such a way that a desired final product is obtained, thereby receiving a lithium-containing filtrate. The addition of the basic lithium source initiates a lithium ion precipitation in the form of a lithium phosphate. The thus obtainable lithium phosphate can be reused in the form of a raw material, whereby said cycle enables lithium to be highly reusable.

L'invention concerne un procédé pour produire des phosphates métalliques de lithium de formule LiMPO4, M signifiant au moins un métal bivalent, de préférence de la première série des métaux de transition. Selon l'invention, un phosphate de lithium est d'abord mis à réagir avec un sel métallique et une source de phosphate acide dans un solvant polaire pour se transformer en un phosphate correspondant contenant M. L'addition d'une source de lithium basique permet d'obtenir un mélange précurseur pour le phosphate métallique de lithium souhaité, ce mélange étant ensuite, de préférence dans des conditions hydrothermiques, transformé et séparé pour donner le produit fini souhaité. On obtient alors un filtrat contenant du lithium. L'addition d'une source de phosphate basique provoque la précipitation des ions de lithium sous forme de phosphate de lithium. Le phosphate de lithium obtenu peut à nouveau servir de matière première, le cycle permettant ainsi une exploitation élevée du lithium.

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