▎ 摘　　要

NOVELTY - Nano-scale graphene material dispersion process involves (i) wetting graphene composite conductive powder with n-butanol, adding surfactant to disperse, and ultrasonically shaking, (ii) taking graphene composite conductive powder and dimethylformamide, and adding organic solvent to completely dissolve, (iii) adding wetted graphene composite conductive powder to dissolved dimethylformamide, heating, and ultrasonically squeezing out bubbles to obtain preliminary modified graphene composite conductive powder, (iv) compounding pre-modified graphene composite conductive powder with non-ionic polymer to inhibit stacking of graphene composite conductive powder, (v) placing graphene composite conductive powder compounded in step (iv) in a mixer for dry mixing, and stirring with main positive electrode material, (vi) subjecting to secondary wetting, adding stirring solvent, and (vii) adding glue solution, and stirring to prepare lithium iron phosphate positive electrode slurry. USE - Nano-scale graphene material dispersion process. ADVANTAGE - The process ensures excellent dispersion effect of the graphene-based composite conductive material, which can meet the usage requirements of the positive and negative electrodes of the graphene composite modified lithium ion battery, and ensures that the battery has excellent charge acceptance. DETAILED DESCRIPTION - Nano-scale graphene material dispersion process involves (i) wetting graphene composite conductive powder with n-butanol, adding sodium dodecylbenzenesulfonate (SDBS) surfactant to disperse, placing in an ultrasonic cleaner and ultrasonically shaking for 1-3 hours before taking out, (ii) taking dimethylformamide and the graphene composite conductive powder at a mass ratio of 1:2, and adding organic solvent to completely dissolve, (iii) adding the wetted graphene composite conductive powder to the dissolved dimethylformamide, stirring and ultrasonically processing for 30-40 minutes, heating to volatilize the organic solvent, using ethylenediamine as a curing agent, completely stirring and ultrasonically squeezing out the bubbles to obtain a preliminary modified graphene composite conductive powder, (iv) performing pre-treatment by compounding the pre-modified graphene composite conductive powder with non-ionic polymer polyvinylpyrrolidone (PVP) to inhibit the stacking of the graphene composite conductive powder, (v) placing the graphene composite conductive powder compounded in step (iv) in a mixer for dry mixing, and stirring the graphene composite conductive powder with main positive electrode material to form a uniform mixture of the conductive agent and the main material in the state of particles, (vi) subjecting the graphene composite conductive powder after stirring in step (v) to secondary wetting, adding a stirring solvent to the graphene composite conductive powder to promote the powder to complete the solvent during the wetting process, and after the powder particles expand uniformly, stop wetting, and (vii) performing high-viscosity stirring, adding glue solution to the graphene composite conductive powder after wetting and swelling, turning on the stirring in a high-viscosity state, and stirring to prepare lithium iron phosphate positive electrode slurry.