Process for the preparation of crystalline lithium-,...

C - Chemistry – Metallurgy – 01 – B

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C01B 25/45 (2006.01) H01M 4/58 (2010.01)

Patent

CA 2701145

The present invention relates to a process for the preparation of compounds of general formula (I) Li a-b M1b V2. c M2c(PO4)x (I) With M1: Na, K, Rb and/or Cs, M2: Ti, Zr, Nb, Cr, Mn, Fe, Co, Ni, Al, Mg and/or Sc, a: 1.5 - 4.5, b: 0- 0.6, c: 0--1.98 and x: number to equalize the charge of Li and V and M1 and/or M2, if present, wherein a-b is > 0, by providing an essentially aqueous mixture comprising at least one lithium-comprising compound, at least one vanadium-comprising compound in which vanadium has the oxidation state +5 and/or +4, and at least one M1-comprising compound, if present, and/or at least one M2-comprising compound, if present, and at least one reducing agent which is oxidized to at least one compound comprising at least one phosphorous atom in oxidation state +5, drying and calcining.

La présente invention concerne un procédé de préparation de composés de formule générale (I): Lia-bM1 bV2-cM2 c(PO4)x, dans laquelle M1 représente Na, K, Rb et/ou Cs; M2 représente Ti, Zr, Nb, Cr, Mn, Fe, Co, Ni, Al, Mg et/ou Sc; a représente 1,5 - 4,5; b représente 0 - 0,6; c représente 0 - 1,98 et x représente le nombre destiné à équilibrer la charge de Li et de V et de M1 et/ou de M2, si présents, a-b étant > 0. Le procédé de l'invention met en uvre un mélange sensiblement aqueux qui comprend: au moins un composé au lithium; au moins un composé au vanadium dans lequel le vanadium présente l'état d'oxydation de +5 et/ou +4; et au moins un composé contenant M1, si présent; et/ou au moins un composé contenant M2, si présent; et au moins un agent réducteur oxydé par rapport à au moins un composé comprenant au moins un atome de phosphore dans l'état d'oxydation de +5. Le procédé consiste ensuite à sécher et calciner les matériaux.

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