Synthesis of lithium-iron-phosphates

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 25/45 (2006.01) C01B 25/26 (2006.01) H01M 4/00 (2006.01) H01M 4/58 (2010.01) H01M 4/62 (2006.01)

Patent

CA 2755522

The present invention relates to a process for the preparation of compounds of general formula (I) Li a-b M1b Fe1--c M2 c P d-c M3 e O x, wherein Fe has the oxidation state +2 and M1, M2, M3, a, b, c, d, e and x are: M1 : Na, K, Rb and/or Cs, M2: Mn, Mg, Al, Ca, Ti, Co, Ni, Cr, V, M3:Si, S, F a:0.8-1.9, b: 0 - 0.3, c: 0 - 0.9, d: 0.8 - 1.9, e: 0 - 0.5, x: 1.0 - 8,depending on the amount and oxidation state of Li, M1, M2, P, M3, wherein compounds of general formula (I) are neutrally charged, comprising the following steps (A) providing a mixture comprising at least one lithium- comprising compound, at least one iron-comprising compound, in which iron has the oxidation state 0, and at least one M1-comprising compound, if present, and/or at least one M2-comprising compound, if present, and/or least one M3-comprising compound, if present, and at least one compound comprising at least one phosphorous atom in oxidation state +5, and (B) heating the mixture obtained in step (A) at a temperature of 100 to 500 °C and at an autogeneous pressure to obtain a compound of general formula (I).

La présente invention concerne un procédé pour la préparation de composés de formule générale (I) Lia-bM1 bFe1-cM2 cPd-eM3 eOx, où Fe a l'état d'oxydation +2 et M1, M2, M3, a, b, c, d, e et x sont : M1 : Na, K, Rb et/ou Cs, M2 : Mn, Mg, Al, Ca, Ti, Co, Ni, Cr, V, M3 : Si, S, F a : 0,8 à 1,9, b : 0 à 0,3, c : 0 à 0,9, d : 0,8 à 1,9, e : 0 à 0,5, x : 1,0 à 8, suivant la quantité et l'état d'oxydation de Li, M1, M2, P, M3, où les composés de formule générale (I) ont une charge neutre, comprenant les étapes suivantes: (A) la production d'un mélange comprenant au moins un composé comprenant du lithium, au moins un composé comprenant du fer, dans lequel le fer a l'état d'oxydation 0, et au moins un composé comprenant M1, le cas échéant, et/ou au moins un composé comprenant M2, le cas échéant, et/ou au moins un composé comprenant M3, le cas échéant, et au moins un composé comprenant au moins un atome de phosphore dans l'état d'oxydation +5, et (B) le chauffage du mélange obtenu dans l'étape (A) à une température de 100 à 500 °C et à une pression autogène pour obtenir un composé de formule générale (I).

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