Process for the preparation of porous crystalline lithium-, vanadium and phosphate-comprising materials

A process for the preparation of a mixture comprising at least one compound according to general formula (I)

• Lia−bM1bV2-cM2c(PO4)x (I)
• wherein M1, M2, a, b, c and x have the following meanings:
• 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,
• and at least one electrically conducting material, said process comprising
• (D) providing an essentially aqueous mixture comprising at least one electrically conducting material, and as substrates at least one lithium-containing compound, at least one vanadium-containing compound in which vanadium has the oxidation state +5 and/or +4, and at least one M1-containing compound, if present, and/or at least one M2-containing compound, if present, at least one reducing agent which is oxidized to at least one compound comprising at least one phosphorous atom in oxidation state +5 and optionally at least one compound being able to generate at least one gaseous compound and/or at least one precursor of a gaseous compound,
• (E) drying the mixture provided in (D), in order to obtain a solid compound and
• (F) calcining the solid compound obtained from (E) at a temperature of 300 to 950° C.,
• wherein at least one of the substrates generates at least one gaseous compound and/or at least one precursor of a gaseous compound and the at least one gaseous compound and/or the gaseous compound generated from the at least one precursor of a gaseous compound is liberated in (E) and/or (F).