▎ 摘　　要

NOVELTY - Preparation of three-dimensional porous microsphere graphene composite, involves mixing graphene or graphene oxide with deionized water, adding adhesive, stirring, carrying out electrostatic spraying and wet collection process to obtain graphene or graphene oxide microspheres, adding into polyvinyl alcohol (PVA) aqueous solution, stirring, dripping crosslinking agent, stirring, ultrasonically maintaining, removing air bubbles, quick-freezing using liquid nitrogen solution, freeze-drying to obtain PVA film containing graphene microspheres and carrying out heat treatment. USE - Preparation of three-dimensional porous microsphere graphene composite for use in preparation of sodium ion battery. ADVANTAGE - The three-dimensional porous microsphere graphene composite has a stable structure, rich hierarchical pore structure, bulk density and other characteristics. The sodium ion battery prepared by the graphite microsphere composite material has high capacity, excellent electrical conductivity, excellent cycle performance and high packing density. DETAILED DESCRIPTION - Preparation of three-dimensional porous microsphere graphene composite, involves mixing graphene or graphene oxide with deionized water where liquid to solid ratio of deionized water and graphene or graphene oxide is 1:(0.1-0.5) mL/g, then adding adhesive where the mass ratio of adhesive and graphene or graphene oxide is (1-10):1, stirring as a solution, carrying out electrostatic spraying and wet collection process to obtain graphene or graphene oxide microspheres, adding polyvinyl alcohol to deionized water, stirring at 60-80 degrees C until completely dissolved to obtain polyvinyl alcohol aqueous solution having concentration of 5-15%, then adding the obtained microspheres directly into the PVA aqueous solution in a mass ratio of 1:1-5, stirring for 3-5 hours, dripping crosslinking agent having concentration of 0.5-1%, continually stirring for 1-2 hours, then ultrasonically maintaining, and removing air bubbles in the solution, quick freezing using liquid nitrogen solution, then freeze-drying at below -80 degrees C for 48-72 hours to obtain PVA film containing graphene microspheres, placing the PVA film containing graphene microspheres in a tubular furnace and finally carrying out heat treatment in an inert gas atmosphere.