Patent ID: 9216912
Filing Date: 2015-12-22
Classification: C01D,C01G,C01P,H01M,Y02E

Abstract:
1. A method for preparing a material having particles of a compound that has a structure of the tavorite type and that corresponds to the formula (I): (A 1-a A′ a ) x (Z 1-b Z′ b ) z (SO 4 ) s F f , in which: A represents Li or Na; A′ represents a vacancy or at least one doping element; Z represents at least one 3d element selected from Fe, Co, and Ni; Z′ represents a vacancy or at least one doping element; the subscripts a, b, x, z, s and f are selected so as to ensure electroneutrality of the compound, and a≧0, b≧0, x≧0, z>0, s>0, f>0; and the respective amounts “a” and “b” of dopant A and Z′ are such that the structure of the tavorite type is preserved, said method comprising the steps of: a 1st step consisting of preparing a mixture of precursors containing a hydrated sulfate of the element or elements Z, the fluoride of the element or elements A, a precursor of the element or elements Z′ when b>0 and a precursor of the element or elements A′ when a>0; a 2nd step consisting of contacting the mixture obtained in the 1st step, with a solid substrate; a 3rd step consisting of bringing the mixture obtained at the end of the 2nd step up to the reaction temperature of the precursors mixed during the 1st step, and maintaining said temperature until the end of the reaction; a 4th step consisting of removing the solid substrate; wherein the solid substrate is a polymer that is solid at room temperature, that has a melting point below the reaction temperature of the precursors and that is stable at least up to the reaction temperature of the precursors, said polymer being soluble in an organic solvent.