| abstract |
The present invention relates to a Process for the preparation of compounds of general formula (I), Li a-b M 1 bFe 1-c M 2 c P d-e M 3 e O x , wherein M 1 , M 2 , M 3 , a, b, c, d and e: M 1 : Na, K, Rb and/or Cs, M 2 : Mn, Mg, Ca, Ti, Co, Ni, Cr, V, M 3 : Si, S, 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, M 1 , Fe, M 2 , P, M 3 , 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 +3, and at least one M 1 -comprising compound, if present, and/or at least one M 2 -comprising compound, if present, and/or least one M 3 -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, (B) optionally drying the mixture provided in step (A), in order to obtain a solid compound and (C) calcining the solid compound obtained from step (A) or (B) at a temperature of 300 to 1000° C. |