▎ 摘　　要

NOVELTY - Preparation of high-temperature-resistant and low-resistivity lithium-ion battery separator involves adding deionized water and ceramic powder to a planetary mixer, placing the mixer in a ultrasonic vibration plate, simultaneously stirring and ultrasonically vibrating, adding dispersant, stirring, adding graphene, stirring, adding aqueous acrylic emulsion and sodium carboxymethyl cellulose, stirring, evacuating, stirring, screening larger particles from obtained slurry, coating obtained graphene-modified ceramic slurry on pre-treated base film by a micro-gravure coater, and drying. USE - Preparation of high-temperature-resistant and low-resistivity separator used for lithium-ion battery for electric vehicles. ADVANTAGE - The method enables preparation of high-temperature-resistant and low-resistivity lithium-ion battery separator with low shrinkage at high temperature, high safety and rapid battery charging. DETAILED DESCRIPTION - Preparation of high-temperature-resistant and low-resistivity lithium-ion battery separator involves adding deionized water and ceramic powder having particle size of 0.05-1 mu m to a planetary mixer at a weight ratio of 5-30:95-70, placing the mixer in a ultrasonic vibration plate, simultaneously stirring and ultrasonically vibrating at 1000 rpm or more for 0.5-2 hours, adding dispersant in an amount of 0.5-5% with respect to the obtained mixed slurry, stirring at 1000 rpm for more for 0.5-2 hours, adding N-methylpyrrolidone, alcohol, propylene carbonate, glycerol, dimethyl sulfoxide, polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether and/or polyvinyl alcohol in an amount of 0.5-10% with respect to the obtained mixed slurry, stirring at 1000 rpm or less for 0.5-2 hours, adding graphene in an amount of 0.5-2% with respect to the obtained mixed slurry, stirring at 1000 rpm for more for 0.5-2 hours, adding 50% aqueous acrylic emulsion and 2% sodium carboxymethyl cellulose solution in an amount of 0.5-10% and 0.3-5%, respectively with respect to the obtained mixed slurry, stirring at 1000 rpm for more for 0.5-2 hours, terminating ultrasonic vibration process, evacuating, reducing speed to less than 500 rpm, stirring for 0.5-1 hours, screening larger particles from obtained slurry with 150-250-mesh screen, obtaining graphene-modified ceramic slurry, pretreating a base film by corona treatment or ozone air shower with ozone flow rate of 0.5-5 L/minute for 5-120 seconds, coating the graphene-modified ceramic slurry on pre-treated base film by a micro-gravure coater at coating speed of 5-20 m/minute to a thickness of 1-5 mu m, drying and winding.