▎ 摘　　要

NOVELTY - The preparation method of the graphene layered composite material involves using a laser for irradiating a laser-induced graphene substrate, where the wavelength range of the laser is 9.3-10.6 µm, 625-740 nm, 450-480 nm and 1053 nm, the laser-induced graphene substrate surface bearing the laser intensity is 3-40J/cm2, the laser-induced graphene substrate contains cellulose (330) and a precursor, and the thickness of the laser-induced graphene substrate is 0.02-0.5 mm. The precursor comprises biomass-based material, synthetic-based material and/or mineral-based material. USE - Preparation method of the graphene layered composite material. ADVANTAGE - In the preparation process of the graphene laminated composite material, a certain amount of cellulose is added into an LIG substrate, and the power and the wavelength of laser are controlled, so that part of the cellulose entering a graphene functional layer is converted into carbonized cellulose. Part of the cellulose and carbonized cellulose molecules are mutually entangled to form a net structure, and part of laser-induced graphene components are nested in the net structure. These celluloses can be more firm and connect the substrate layer and the graphene functional layer. The problem that the graphene functional layer and the substrate layer are not firm in combination is overcome, so that the graphene and the substrate can be firmly combined and are not easy to fall off, and the characteristics of excellent flexibility and weather resistance are realized. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of a layered laser-induced graphene substrate, which involves: mixing the precursor with cellulose to prepare laser-induced graphene-based material slurry, where the precursor comprises petroleum-based materials and bio-based materials, the petroleum and materials comprise graphene oxide and polyimide, and the bio-based materials comprise lignin, tea polyphenol and/or tannic acid, carrying out hot press molding on the slurry. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of laser-induced graphene nested in cellulose and cellulose carbide structures. 210Laser induced graphene 330Cellulose 340Carbonized cellulose