▎ 摘　　要

NOVELTY - Fluorinated phosphoric acid iron sodiumpyrophosphate /carbon (C)/reduced graphene oxide (RGO) composite material comprises reduced graphene oxide, and active carbon particles composited on its surface in situ, where the active carbon particles are coated by fluorinated phosphoric acid iron sodium pyrophosphate that has linear formula of Na4Fe3PO4P2O7F3. USE - The fluorinated phosphoric acid iron sodiumpyrophosphate/C/RGO composite material is used for making anode material of sodium ion battery (claimed). ADVANTAGE - The fluorinated phosphoric acid iron sodium pyrophosphate/C/RGO composite material has high theoretical quantity, high voltage, stable circulation and low raw material cost, good industrialization prospects, novel active component and innovative double carbon in situ composite morphology that can effectively solve the technical problems of the phase transition, poor stability and poor electrical performance of the existing iron-based anode material. It effectively increases the voltage, capacity, rate and cycle stability of the material. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing fluorinated phosphoric acid iron sodium pyrophosphate/C/RGO composite material, which involves mixing phosphorus source, sodium source, iron source, fluorine source, RGO, and complexing agent in water, adjusting the pH of the obtained solution to 3-4, and then volatilizing and drying the contents to obtain a precursor, and placing the precursor in a protective atmosphere and heating at 500-650 degrees C to obtain the required product; and (2) application of fluorinated phosphoric acid iron sodium pyrophosphate/C/RGO composite material, which involves using it as anode active material of sodium ion battery, mixing it with binder and conductive agent, coating on current collector, and solidifying to obtain anode material of sodium ion battery.