▎ 摘　　要

NOVELTY - The method involves selecting a conductive material with a specific morphology as a template and uniformly dispersing in a solution of arylmethylene halide and polyimidazole compound. The solid powder is washed with dimethylformamide and ethanol. The conductive material coated with the imidazole-based ionic polymer is added to the aqueous solution of sodium metavanadate. The conductive material coated with the metavanadate ion polymer is in a porcelain boat, sealed in a quartz tube, pyrolyzed at a specific temperature. The conductive material refers to carbon nanotubes, graphene oxide, carbides, nitride and sulfide. The arylmethylene halide refers to aryl benzyl bromide, alkyl bromide, and aromatic benzyl chloride and alkyl chloride. The polyimidazole compound refers to a polyimidazole aryl compound and polyimidazolidinyl compound. The mixed solvents are bin any ratio among organic solvents such as acetonitrile and tetrahydrofuran. The inert atmosphere is nitrogen or argon. USE - Preparation method of vanadium nitride nanoparticle composite material for lithium-sulfur batteries. ADVANTAGE - The preparation method has easy-to-obtain raw materials and convenient operation. The imidazole-based ions are effectively inhibit the agglomeration and sintering of in-situ generated nanoparticles. The nanoparticles increase the number of active sites for polysulfide adsorption and catalytic conversion. The method has good general applicability and is extended to the preparation of various ultrafine metal nanomaterials. The hierarchical pore structure of carbon materials promote mass transfer and increase the loading of active sulfur. The carbon material and the vanadium nitride reduce the interface steric hindrance and promote electron transport, thus, increasing the kinetic rate of the sulfide redox reaction. The vanadium nitride nanoparticle composite material effectively inhibits the shuttle effect of polysulfides, promotes the utilization efficiency of sulfur, and obtains high energy density and cycle stability. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a transmission electron microscope diagram of the vanadium nitride nanoparticle composite material.