FLUOROSULPHATES USEFUL AS ELECTRODE MATERIALS

摘要

The invention relates to a material made up of particles of an optionally-doped fluorosulphate. The fluorosulphate has a disdtorted Tavorite type structure of formula (A1-aA'a)x(Z1-bZ'b)z(SO4)sFf (I) where A = Li or Na, A' 0 a hole or at least one doping element, Z = at least one element selected from Fe, Co and Ni, Z' = a hole or at least one doping element, the indices a, b, x, z, s, and f are selected to assure the electroneutrality of the compound and a =0, b=0, x=0, z>0, s>0, f>0, the respective quantities a and b of dopant A and Z' being such that the Tavorite type structure is preserved. The material is obtained from the precursors thereof by an ionothermal route or ceramic route in a closed reactor. The material is of particular use as an active electrode material.