▎ 摘　　要

NOVELTY - Preparation of three-dimensional printed niobium carbide/reduced graphene oxide composite sodium metal negative electrode involves: (1) preparing graphene oxide dispersion liquid, mixing with niobium carbide solution and zinc sulfate heptahydrate solution, stirring, centrifuging, and grinding black gel to obtain niobium carbide/graphene oxide composite ink; (2) transferring to a syringe cylinder, printing a three-dimensional ordered porous structure layer by layer through a needle tip, and freeze-drying niobium carbide/graphene oxide composite three-dimensional ordered porous structure; (3) annealing to obtain a three-dimensional printed niobium carbide/reduced graphene oxide composite aerogel; (4) loading into a CR2032 coin cell battery, and conducting constant current discharge treatment under a preset area current density using a sodium sheet as counter electrode; and (5) disassembling the battery after discharge treatment, and taking out composite aerogel. USE - Preparation of three-dimensional printed niobium carbide/reduced graphene oxide composite sodium metal negative electrode used for rechargeable battery used in mobile phone, notebook computer, and electric or hybrid power vehicle. ADVANTAGE - The method saves raw materials, and reduces cost. DETAILED DESCRIPTION - Preparation of three-dimensional printed niobium carbide/reduced graphene oxide (Nb2CTx/rGO) composite sodium metal negative electrode involves: (1) preparing a graphene oxide dispersion liquid by improved Hummer method, mixing with 20 %mass niobium carbide solution and 0.1-0.8 %mass zinc sulfate heptahydrate solution, stirring, centrifuging at low temperature, and grinding black gel at a bottom of a centrifuge tube to obtain niobium carbide/graphene oxide composite ink; (2) transferring to a syringe cylinder, printing a three-dimensional ordered porous structure layer by layer through a needle tip by direct-writing three-dimensional printing, and freeze-drying niobium carbide/graphene oxide composite three-dimensional ordered porous structure using a freeze dryer; (3) annealing at high temperature in a tubular furnace to obtain a three-dimensional printed niobium carbide/reduced graphene oxide composite aerogel; (4) loading into a CR2032 coin cell battery, and conducting constant current discharge treatment under a preset area current density using a sodium sheet as counter electrode; and (5) disassembling the battery after discharge treatment, and taking out composite aerogel.