Preparation method of three-dimensional orderly macroporous sodium ferrous fluorophosphate material

The invention relates to a preparation method of a three-dimensional orderly macroporous sodium ferrous fluorophosphate material. The preparation method comprises the steps: on the basis of a colloidal crystal template method, a template is filled with Na2FePO4F precursor solutions with different concentrations, a three-dimensional orderly macroporous Na2FePO4F material is obtained in the sintering process, the diameter of large pores is about 150-180 nm, the pore wall thickness is about 30-50 nm, and pore passages are uniform and orderly. The preparation method is simple in process, the three-dimensional orderly macroporous sodium ferrous fluorophosphate material serves as the cathode material of a sodium-ion battery, because of the special porous structure of the three-dimensional orderly macroporous sodium ferrous fluorophosphate material, the contact area of an electrolyte and an active material can be enlarged, the volume change of sodium ions in the intercalating and removal processes is relieved, and c