▎ 摘　　要

NOVELTY - A defective three-dimensional graphite-based bulk material is prepared by mixing structurally-rich deoxidized graphene solution with reducing agent solution, heating and washing product. A high-nitrogen boron-doped three-dimensional graphene film is prepared by mixing defective three-dimensional graphene block material with aqueous solution of nitrogen-boron compound, heating to form high-nitrogen boron-doped graphene bulk material, washing graphene bulk material, pressing graphene bulk material at 5-40 MPa and drying high-nitrogen boron-doped graphene bulk material. USE - Preparation of high-boron-doped three-dimensional graphene film used for flexible lithium-ion hybrid capacitor. ADVANTAGE - The method enables preparation of high-boron-doped three-dimensional graphene film with improved doping amount of nitrogen and boron. The flexible lithium-ion hybrid capacitor comprising the high-boron-doped three-dimensional graphene film has excellent magnification characteristics and energy storage characteristics. DETAILED DESCRIPTION - A deoxidized oxidized graphite solution is prepared by mixing oxidized graphite solution with acid in predetermined ratio and heating mixture at 50-150 degrees C for 2-8 hours, to obtain defective oxidized graphite solution, centrifugally separating and washing defective oxidized graphite solution until the pH is 7, to form defective oxidized graphite solution with concentration of 0.5-20 mg/mL. The concentration of oxidized graphite is 0.5-30 mg/mL. The content of acid is 10-90 %mass. The volume ratio of oxidized graphite solution and acid is 15:1-5:1. A flaw-depleted graphene solution is prepared by peeling off structurally defective oxidized graphite solution. The concentration of deoxidized graphene solution is 0.5-20 mg/mL. A defective three-dimensional graphite-based bulk material is prepared by mixing structurally-rich deoxidized graphene solution with reducing agent solution, heating at 50-150 degrees C for 1-12 hours and washing product. The volume ratio of graphene oxide solution and reducing agent solution is 20:1-5:1. The concentration of reducing agent solution is 0.1-10 mol/L. A high-nitrogen boron-doped three-dimensional graphene film with thickness of 0.01-0.1 mm is prepared by mixing defective three-dimensional graphene block material with aqueous solution of nitrogen-boron compound, heating at 50-150 degrees C for 3-12 hours to form high-nitrogen boron-doped graphene bulk material, washing high-nitrogen boron-doped graphene bulk material, pressing high-nitrogen boron-doped graphene bulk material at 5-40 MPa and drying high-nitrogen boron-doped graphene bulk material. The mass ratio of three-dimensional graphene block material and aqueous solution of nitrogen-boron compound is 0.5:1-10:1. The concentration of aqueous solution of nitrogen-boron compound is 0.001-1 %mass.