▎ 摘　　要

NOVELTY - Preparation of graphene-based composite sodium metal negative electrode, involves grinding or ultrasonically mixing 1 L ionic liquid with graphene oxide to obtain graphene oxide dispersion, adding the dispersion to carbon nanotubes, or adding a metal source and a sulfur source to the dispersion, mixing, ultrasonically processing to obtain a mixture of graphene oxide composite, transferring the composite to a reactor, reacting at 140-220℃ for 4-24 hours, washing with deionized water, freeze-drying to obtain a black solid, physically attaching the black solid on a current collector, drying, slicing, loading into a button battery in which the counter electrode is a sodium sheet, carrying out constant current discharge treatment, and disassembling the battery. The content of black solid is 2.5-33 wt.%, the content of sodium metal is 2.5-35 wt.%, and the mass ratio of graphene oxide and metal source is 1:1-5:1. USE - Preparation of graphene composite sodium metal negative electrode (claimed) used in sodium metal battery. ADVANTAGE - The graphene composite sodium metal negative electrode has high conductivity and specific surface area, and reduced sodium nucleation potential, and uniform deposition of sodium metal without dendritic crystals, which improves cycle life. The three-dimensional structure provides more sodium storage space, effectively relieving the volume expansion problem of metal sodium. DETAILED DESCRIPTION - Preparation of graphene-based composite sodium metal negative electrode, involves grinding or ultrasonically mixing 1 L ionic liquid with graphene oxide in a mass ratio of 1:1-4:1 to obtain 3-10 mg/ml graphene oxide dispersion, adding the dispersion to carbon nanotubes in a mass ratio of 5:1-10:1, or adding a metal source and a sulfur source in a molar ratio of 1:2-1:4 to the dispersion, mixing, ultrasonically processing to obtain a mixture of graphene oxide composite, transferring the composite to a reactor, reacting at 140-220℃ for 4-24 hours, washing with deionized water, freeze-drying to obtain a black solid (3D-X/reduced graphene oxide, where X is carbon nanotubes or sulfide MxSy, M is metal atom, and x and y are 1-3) (3D-X/rGO), physically attaching the black solid on a current collector, drying, slicing, loading into a button battery in which the counter electrode is a sodium sheet, carrying out constant current discharge treatment, and disassembling the battery. The content of black solid is 2.5-33 wt.%, the content of sodium metal is 2.5-35 wt.%, and the mass ratio of graphene oxide and metal source is 1:1-5:1. An INDEPENDENT CLAIM is included for the negative electrode, which has a porous crosslinked three-dimensional structure and a thickness of 1 nm to 600 µm.