“…The direct synthesis of oxyfluorides can be carried out by solid-state reaction, , metal dissolution in aqueous HF solution following by evaporation, solvothermal methods, , high pressure, and solid–gas reaction under fluorination agents. , Later, the mechanosynthesis route provided a simple and scalable alternative to directly prepare oxyfluorides with three or more 3d transition metals such as for Li 1.3 Mn 2+ 0.1 Co 2+ 0.1 Mn 3+ 0.1 Cr 3+ 0.1 Ti 0.1 Nb 0.2 O 1.7 F 0.3 and Li x (Co 0.2 Cu 0.2 Mg 0.2 Ni 0.2 Zn 0.2 )OF x . Otherwise, it is also possible to prepare some oxyfluorides by an indirect method, consisting of decomposition of a hydroxyl or hydrated fluorides under an inert atmosphere In this way, our group successfully synthesized various multimetallic oxyfluorides from M 2+ M 3+ F 5 (H 2 O) 2 , M 2+ M 3+ 2 F 8 (H 2 O) 2 or M 2+ 3 M 3+ 2 F 12 (H 2 O) 12 (M 2+ = Fe, Co, Ni, Mn, Cu; M 3+ = Al, V, Fe). − More recently, Co 0.5 Fe 0.5 O 0.5 F 1.5 has been obtained by thermal treatment under air of the hydrated fluoride precursor CoFeF 5 (H 2 O) 7 , initially prepared by the evaporation of a HF concentrated solution with Co 2+ and Fe 3+ metallic salts …”