▎ 摘　　要

NOVELTY - Preparing graphene conductive ink comprises e.g. (i) dissolving dispersant in ethanol to obtain an ethanol solution, and adding graphene into the ethanol solution to obtain a graphene primary dispersion and dispersant comprises at least one of methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, cellulose acetate, or nitrocellulose; (ii) performing an ultrasonic dispersion of the graphene primary dispersion in an ice water bath to obtain an ultrasonic dispersion; (iii) adding the target solvent into the primary ultrasonic dispersion, and then performing secondary ultrasonic dispersion to obtain a secondary ultrasonic dispersion, the target solvent comprises at least one of cyclohexanone, terpineol, ethanol, ethylene glycol, isopropanol, ethyl lactate, octyl acetate, or diethylene glycol dimethyl ether; and (iv) heating secondary ultrasonic dispersion under stirring conditions and evaporating excess ethanol to obtain a graphene conductive ink. USE - The graphene conductive ink is useful for blade coating, screen printing, direct writing, inkjet printing and for preparing solid graphene or graphene composite film and pattern. ADVANTAGE - The method: is simple, environmentally-friendly and economical. DETAILED DESCRIPTION - Preparing graphene conductive ink comprises (i) dissolving dispersant in ethanol to obtain an ethanol solution, and adding graphene into the ethanol solution to obtain a graphene primary dispersion, where the concentration of the dispersant is 2.5-50 mg/ml and graphene is 2.5-50 mg/ml and dispersant comprises at least one of methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, cellulose acetate, or nitrocellulose; (ii) performing an ultrasonic dispersion of the graphene primary dispersion in an ice water bath to obtain an ultrasonic dispersion; (iii) adding the target solvent into the primary ultrasonic dispersion, and then performing secondary ultrasonic dispersion to obtain a secondary ultrasonic dispersion, the target solvent comprises at least one of cyclohexanone, terpineol, ethanol, ethylene glycol, isopropanol, ethyl lactate, octyl acetate, or diethylene glycol dimethyl ether and volume ratio of ethanol and target solvent in step (i) is (1-15):1; and (iv) heating secondary ultrasonic dispersion under stirring conditions and evaporating excess ethanol to obtain a graphene conductive ink, where the concentration of graphene is 7.5-150 mg/ml. INDEPENDENT CLAIMS are also included for: (1) graphene conductive ink film, prepared as mentioned above which is set on a base material by blade coating, spin coating, direct writing, screen printing or inkjet printing and annealing to obtain a graphene conductive film, preferably annealing is thermal annealing or laser annealing, where the temperature of the thermal annealing is 180-400 degrees C carried out for 10-120 minutes and the atmosphere of the thermal annealing is air, argon or nitrogen and laser annealing annealing power is 1-50W and carrying out for 1-120 seconds; and (2) graphene conductive ink film composite material film, prepared by mixing graphene conductive ink with a functional material, functional material comprises at least one of nickel-cobalt lithium manganate, lithium cobaltate, lithium ferrophosphate, nickel-cobalt-manganese ternary material, nickel-cobalt-aluminum ternary material, carbon, silicon, sulfur, phosphorus, manganese dioxide, iron oxide, nickel oxide, vanadium oxide, lithium sulfide, molybdenum sulfide, nickel sulfide, titanium carbide, titanium nitride, or vanadium nitride, size of the functional material is micro-scale or nano-scale, where shape of the nano-scale functional material is zero-dimensional, one-dimensional, two-dimensional or three-dimensional, the mixing method is manual grinding, mechanical stirring, ultrasonic vibration, high-speed shearing or ball milling, setting the graphene conductive ink composite material on a base material by means of blade coating, spin coating, direct writing, screen printing or inkjet printing, and annealing the graphene composite material film to obtain a graphene composite material film.