▎ 摘　　要

NOVELTY - Method for preparing graphene, involves (a) using graphite paper as positive electrode, metal lithium sheet as negative electrode, and lithium perchlorate trihydrate propylene carbonate solution as electrolyte, and porous polypropylene film as isolation membrane, and assembling to lithium-ion battery in glove box filled with high-purity argon, where the electrolyte and lithium slices are excessive, (b) placing battery in charging and discharging device at current density of 10-20 mA/g, and after leaving still for 10 minutes, discharging at same current density to 0 V, (c) disassembling battery in glove box, oxidizing intercalated graphite paper in blast drying oven at 30-60 degrees C for 4-10 hours for converting embedded inside metal lithium to lithium oxide, and (d), placing oxidized graphite paper in graphite crucible, performing graphitization in 3000 degrees C graphitization furnace, and stripping graphite paper to graphene by lithium oxide gasification. USE - Method for preparing graphene. ADVANTAGE - The method realizes the large-scale production of high-quality graphene, and is simple, economical, safe and environmentally-friendly. DETAILED DESCRIPTION - Method for preparing graphene, involves (a) using graphite paper as positive electrode, metal lithium sheet as negative electrode, and lithium perchlorate trihydrate propylene carbonate solution as electrolyte, and porous polypropylene film as isolation membrane, and assembling to lithium-ion battery in glove box filled with high-purity argon, where the electrolyte and lithium slices are excessive, (b), placing battery in charging and discharging device at current density of 10-20 mA/g (for graphite paper) (for lithium intercalation on graphite paper) to 0 V (vs. lithium/lithium+), and after leaving still for 10 minutes, discharging at same current density to 0 V, repeating the process several times until the battery voltage is constant at 0 V, (c) disassembling battery in glove box, oxidizing intercalated graphite paper in blast drying oven at 30-60 degrees C for 4-10 hours for converting embedded inside metal lithium to lithium oxide, and (d), placing oxidized graphite paper in graphite crucible, performing graphitization in 3000 degrees C graphitization furnace, and stripping graphite paper to graphene by lithium oxide gasification.