The invention relates to the field of
sodium ion battery positive
electrode materials, in particular to an rGO-coated Mn-Ti co-doped
sodium ferric fluorophosphate material as well as a preparation method and application of the rGO-coated Mn-Ti co-doped
sodium ferric fluorophosphate material. The
chemical formula of the catalyst is Na2FexMnyTizPO4F (at) rGO, wherein 0.05 < = y < = 0.10, 0.02 < = z < = 0.05, and x + y + z = 1; by optimizing the
raw material proportion and
sintering conditions and adopting the two-time
sintering process of low-temperature pre-
sintering-ball milling in the
inert atmosphere-secondary sintering, the raw materials are uniformly mixed on the premise that the raw materials are not oxidized and deteriorated by air, the contact area is increased, efficient
ion migration and lattice formation among reactants are facilitated, and the purity of the product is improved. The anion F with strong
electronegativity is successfully introduced to form a relatively
strong binding force with a
phosphate group, so that the generation of
pyrophosphoric acid is inhibited, and the
crystal structure is optimized; through Mn-Ti co-
doping, the stability of a
voltage platform and a
material structure is effectively improved, so that the material has relatively
high energy density and relatively long cycle life; meanwhile, a stable
interface layer can be formed on the surface of the material through two-dimensional rGO
coating, interface side reactions are reduced, and the
cycling stability is improved.