▎ 摘　　要

NOVELTY - Preparing lithium-sulfur battery anode material comprises (i) configuring oxidized graphene solution into 1-4 mg/ml, (ii) adding deionized water, acrylonitrile and graphene oxide(GO) solution into beaker and stirring, dripping, stirring and reacting, washing and drying, (iii) adding spinning solution into syringe, performing electrostatic spinning, (iv) adding polyacrylonitrile/oxidized graphene fiber into muffle furnace, heating, (v) heating the polyacrylonitrile/graphene oxide fiber, heat processing under nitrogen atmosphere of high temperature, washing, (vi) mixing in-situ nitrogen-doped carbon fiber/reduction-oxidation graphene and nano sulfur, grinding, heating, dripping, (vii) mixing in-situ nitrogen-doped carbon fiber/reduction-oxidation graphene/sulfur cathode material, the conductive agent and the binder polyvinylidene fluoride (PVDF), dripping the N-methylpyrrolidone, drying, rolling and cutting to obtain the lithium-sulfur battery anode material. USE - The method is useful for preparing lithium-sulfur battery anode material. ADVANTAGE - The material has excellent conductivity and polysulfide adsorption capacity. The method improves the electrochemical performance of the lithium-sulfur battery. DETAILED DESCRIPTION - Preparing lithium-sulfur battery anode material comprises (i) configuring oxidized graphene solution into 1-4 mg/ml, (ii) adding deionized water, acrylonitrile and graphene oxide(GO) solution into the beaker and stirring, dripping the concentrated sulfuric acid, sodium thiosulfate solution and potassium persulfate solution, continuously stirring and reacting at 50-100 degrees C for 0.5-1.5 hours, carrying out vacuum filtering, washing the obtained solid by de-ionized water and drying to obtain the polyacrylonitrile (PAN)/GO composite material, where the volume ratio of de-ionized water, acrylonitrile, GO solution, concentrated sulfuric acid, sodium thiosulfate solution, potassium persulfate solution is 50-150:5-20:1-50:0.5-2:1-5:5-25, the concentration of GO solution is 2 mg/ml, the mass percentage of the sodium thiosulfate solution is 1-10%, the mass fraction of potassium persulfate solution is 1-2%, (iii) adding the spinning solution into the syringe, performing electrostatic spinning by the following parameters, where the distance between the needle tip and the receiving barrel is 25 cm, the applied voltage 18KV, injection pump rate is 0.3 ml/hour, collector 500 revolutions/minutes to obtain polyacrylonitrile/graphene oxide fiber, where the spinning liquid is comprises N, N-dimethylformamide and PAN/GO composite material, the mass ratio of PAN/GO: N, N-dimethylformamide is 1: 1-10, (iv) adding polyacrylonitrile/oxidized graphene fiber into the muffle furnace, heating to 200-300 degrees C stable for 1-10 hours, (v) heating the polyacrylonitrile/graphene oxide fiber to 500-1200 degrees C, heat processing under nitrogen atmosphere of high temperature to obtain oxidized polyacrylonitrile/graphene oxide fiber, heat preserving for 1-5 hours, adding the product into sodium hydroxide solution for 1-5 hours, washing the product with distilled water, reducing oxide graphene composite material at 50-120 degrees C for 1-12 hours to obtain the in-situ nitrogen-doped carbon fiber, (vi) mixing in-situ nitrogen-doped carbon fiber/reduction-oxidation graphene and nano sulfur, grinding to not display yellow, drying in the vacuum drying box in an agate mortar for 1-20 minutes, placing argon atmosphere into the reaction kettle, sealing the reaction kettle, heating at 100-160 degrees C for 1-12 hours to obtain the in-situ nitrogen-doped carbon fiber/reduction oxidation graphene/sulfur composite material, where the mass ratio of in-situ nitrogen-doped carbon fiber/reduction-oxidation graphene nano sulfur is 3:1. the total mass of the carbon bisulfide both grinding time interval into two carbon sulfide, dripping is nanophase sulfur is 10-55%, (vii) mixing in-situ nitrogen-doped carbon fiber/reduction-oxidation graphene/sulfur cathode material, the conductive agent and the binder polyvinylidene fluoride (PVDF), dripping the N-methylpyrrolidone to obtain slurry, and coating on the current collector, drying, rolling and cutting to obtain the lithium-sulfur battery anode material, where the ratio of in-situ nitrogen-doped carbon fiber/reduction-oxidation graphene/sulfur composite material: conductive agent: binder is 7-8.5:0.5-2:1.