▎ 摘　　要

NOVELTY - Preparing graphene comprises (a) adding the electrolyte into the electrolytic cell, the graphite sheet bound by titanium mesh is anode, and the platinum sheet is cathode, pre-electrolyzing graphite sheets bound by titanium mesh, and peeling off the graphite sheet to produce graphene, which is suspended on the liquid surface of the electrolyte, (b) carrying out vacuum suction filtration cleaning of the electrolyte, removing residual electrolyte ion, collecting the graphene on filter paper, (c) subjecting the collected graphene solution to ultrasonic treatment, (d) freeze-drying the graphene solution, drying, powdering the freeze-dried graphene, (e) mixing the pulverized graphene product and activated pore-forming agent, activating, sieving to obtain semifinished porous graphene, (f) placing the semifinished porous graphene in water to obtain a liquid, vacuum filtering the liquid, collecting the graphene solution, carrying out secondary freeze-drying, powdering and sieving. USE - Preparation method of graphene is useful for preparing lead-carbon alloy cathode material (claimed). ADVANTAGE - The method is environment-friendly, economical, and is suitable for batch production. The conductivity of graphene is 18000-30000 S/cm, the number of layers is 1-2 layers, and the specific surface area is 1200-1500 m2/g, can improve the cycle life of the battery as high as 7320 times. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing a lead-carbon alloy cathode material.