▎ 摘　　要

NOVELTY - Preparing nitrogen-doped fluorinated modified graphene cathode material comprises dispersing the expanded graphite in deionized water, cutting, peeling by high speed homogenizer to obtain graphene, uniformly mixing the graphene and the fluorine source, performing low-temperature gas fluorination, filtering deionized water, drying to obtain fluorinated modified graphene, placing the fluorinated modified graphene and nitrogen source in a polytetrafluoroethylene lined reaction kettle, reacting, dispersing in ethanol after washing with water, filtering, washing and drying to obtain nitrogen-doped fluorinated modified graphene cathode material, where the size of the N-layer graphene is 1-50 μm, the mass ratio of the graphene to the fluorine source is 1-3:1, the mass ratio of the fluorinated modified graphene to the nitrogen source is 2-4:1 and in the nitrogen-doped fluorinated modified graphene cathode material, the fluorine content is 3-4% and the nitrogen content is 15-22%. USE - The method is useful for preparing nitrogen-doped fluorinated modified graphene cathode material. ADVANTAGE - The method enables the fluorine to modify the surface of graphene and assists in increasing the doping content of nitrogen atoms and reduces the diffusion barrier of potassium ions. DETAILED DESCRIPTION - Preparing nitrogen-doped fluorinated modified graphene cathode material comprises dispersing the expanded graphite in deionized water, cutting, peeling by high speed homogenizer to obtain graphene, uniformly mixing the graphene and the fluorine source, performing low-temperature gas fluorination, filtering deionized water, drying to obtain fluorinated modified graphene, placing the fluorinated modified graphene and nitrogen source in a polytetrafluoroethylene lined reaction kettle, reacting, dispersing in ethanol after washing with water, filtering, washing and drying to obtain nitrogen-doped fluorinated modified graphene cathode material, where the size of the N-layer graphene is 1-50 μm, N = 3-10, N is a positive integer, the mass ratio of the graphene to the fluorine source is 1-3:1, the mass ratio of the fluorinated modified graphene to the nitrogen source is 2-4:1 and in the nitrogen-doped fluorinated modified graphene cathode material, the fluorine content is 3-4% and the nitrogen content is 15-22%. An INDEPENDENT CLAIM is also included for a potassium/nitrogen doped fluorinated modified graphene battery.