▎ 摘　　要

NOVELTY - Preparation of aluminum foil involves adding graphite powder, potassium persulfate and phosphorus pentoxide to concentrated sulfuric acid, heating, stirring, cooling, washing, drying to obtain pre-oxidized graphite powder, adding pre-oxidized graphite powder to concentrated sulfuric acid, stirring, adding potassium permanganate, deionized water and hydrogen peroxide, oxidizing, filtering, removing the metal ions, centrifuging the mixture to obtain graphene oxide, adding graphene dispersant to graphene oxide, ultrasonically mixing in water to obtain graphene dispersion liquid, mixing graphene dispersion liquid with carbon black, ultrasonically dispersing to obtain graphene slurry, adding acrylic resin to dispersed graphene slurry, ultrasonically stirring to obtain graphene coating solution, immersing the aluminum foil in graphene coating solution, vacuum-drying to obtain semi-finished graphene-coated aluminum foil and annealing the semi-finished product. USE - Preparation of aluminum foil for lithium ion battery. ADVANTAGE - The method produces aluminum foil utilizing graphene oxide which is highly dispersed and evenly attached to the aluminum foil. The aluminum foil utilizes carbon black which is added to the graphene dispersion as a conductive medium to further enhance its conductive properties and utilizes polypropylene resin solution which enhances the adhesion of graphene and carbon black on aluminum foil, improves the adhesion performance of graphene coating and aluminum foil and overcomes the expansion and separation phenomenon of existing carbon materials. The aluminum foil has good processing performance and economically improves the overall performance of the lithium ion battery and utilizes coating solution having coating thickness of 0.2-2 mu m to improve the conductivity of the electrode and to provide large capacity for the battery without losing energy density. DETAILED DESCRIPTION - Preparation of aluminum foil involves adding 2.5-3.5 pts. wt. graphite powder, 2-3 pts. wt. potassium persulfate and 2-3 pts. wt. phosphorus pentoxide to 0.5 wt.% concentrated sulfuric acid, heating at 80 degrees C in a water bath, stirring for 6 hours, cooling to room temperature, washing with deionized water, drying at room temperature to a water content of less than 5 wt.% to obtain pre-oxidized graphite powder, adding pre-oxidized graphite powder to 5 wt.% concentrated sulfuric acid, stirring in an ice bath, adding 0.3 wt.% potassium permanganate, deionized water and hydrogen peroxide, oxidizing, filtering, removing the metal ions by washing with hydrochloric acid having concentration of 10 wt.%, centrifuging the mixture to obtain graphene oxide, adding 33 wt.% high-efficiency graphene dispersant to graphene oxide, ultrasonically mixing in water to obtain 10 wt.% graphene dispersion liquid, mixing graphene dispersion liquid with carbon black in a mass ratio of 1:1, ultrasonically dispersing for 1 hour to obtain graphene slurry, adding acrylic resin to dispersed graphene slurry, ultrasonically stirring for 2 hours to obtain graphene coating solution, immersing the aluminum foil in graphene coating solution for 15-30 minutes, removing after treated at 100 degrees C, vacuum-drying to obtain semi-finished graphene-coated aluminum foil and annealing the semi-finished product at 200 degrees C under nitrogen and hydrogen protection for 1 hour.