Abstract: A fluoro material is provided for use as an electrode active material as well as a process tar producing it. The material includes particles of a fluorosulfate which corresponds to formula (I) L1-yFe1-xMnxSO4F (I) in which 0<x?1 and 0?y<1. The material includes a phase of triplite structure and optionally a phase of tavorite structure, the phase of triplite structure representing at least 50% by volume. The material may be obtained from precursors of the elements of which it is constituted, via a ceramic route, via an ionothermal route or via a polymer route.

Abstract: A low-cost positive electrode material for sodium ion secondary batteries has a high redox potential. A sodium ion secondary battery uses this material as a positive electrode active material. The positive electrode active material for sodium ion secondary batteries contains a sulfate represented by NamMn(SO4)3 (in which M represents a transition metal element; m is 2±2x (in which x satisfies 0?x?0.5); and n is 2±y (in which y satisfies 0?y?0.5)).

Abstract: A fluoro material is provided for use as an electrode active material as well as a process for producing it. The material includes particles of a fluorosulfate which corresponds to formula (I) Li1-yFe1-xMnxSO4F (I) in which 0<x?1 and 0?y<1. The material includes a phase of triplite structure and optionally a phase of tavorite structure, the phase of triplite structure representing at least 50% by volume. The material may be obtained from precursors of the elements of which it is constituted, via a ceramic route, via an ionothermal route or via a polymer route.