▎ 摘　　要

NOVELTY - Preparing graft-doped graphene-polyethylene glycol-based electrolyte coating film involves heating the mixture of polyethylene glycol-based polymer and pore-forming agent, cyclodextrin-based molecule and end-capped polymer respectively, and dissolving them in a liquid solvent, to obtain three kinds of liquid solutions. The three kinds of liquid solutions are mixed, then stirred for 12-14 hours, added the graft-doped graphene additive, and continue to heat and stirred for 5-48 hours to prepare a mixed solution. The surface of the polyolefin film is put under corona discharge, low temperature plasma discharge, atmospheric pressure glow discharge or sub-atmospheric pressure glow discharge for 10 seconds to 5 minutes, and used the steam of organic solvent for 3 seconds to 15 minutes. The mixed solution is coated on the steam-treated polyolefin film to obtain a coating film. USE - Method for preparing graft-doped graphene-polyethylene glycol-based electrolyte coating film. ADVANTAGE - The method improves the liquid absorption and liquid retention capacity, high temperature resistance performance, ionic conductivity, surface impedance and battery compatibility of the polymer film. DETAILED DESCRIPTION - Preparing graft-doped graphene-polyethylene glycol-based electrolyte coating film involves heating the mixture of polyethylene glycol-based polymer and pore-forming agent, cyclodextrin-based molecule and end-capped polymer respectively, and dissolving them in a liquid solvent, to obtain three kinds of liquid solutions. The three kinds of liquid solutions are mixed, then stirred for 12-14 hours, added the graft-doped graphene additive, and continue to heat and stirred for 5-48 hours to prepare a mixed solution. The surface of the polyolefin film is put under corona discharge, low temperature plasma discharge, atmospheric pressure glow discharge or sub-atmospheric pressure glow discharge for 10 seconds to 5 minutes, and used the steam of organic solvent for 3 seconds to 15 minutes. The mixed solution is coated on the steam-treated polyolefin film to obtain a coating film. The coating film is placed in the conversion solution, and ultrasonically treated at a temperature range of 40-62℃ for 1-24 hours to form a conversion film, performed ultrasonic treatment, dissolved pore-forming agent in the conversion film in the conversion liquid to obtain a porous conversion film. The porous conversion film is vacuum dried in the temperature range of 70-125℃ to obtain a dry porous conversion film. The dry porous conversion film is vacuumed in a vacuum drying oven to remove volatile substances, sprayed an electrolyte solution containing lithium salt or sodium salt, and cooled to room temperature to obtain an electrolyte coating film.