▎ 摘　　要

NOVELTY - Preparing graphene/silica-carbon composite material using microcrystalline graphite as carbon source comprises e.g. mixing microcrystalline graphite powder with carbon and graphene oxide to obtain mixed solution, adding dispersant to mixed solution, ultrasonically dispersing to form a suspension, adding into three-necked flask, placing on ultrasonic atomizer for ultrasonic atomization to form a mixed mist bead, sealing one mouth of three-necked flask with rubber plug, connecting one inlet to inert gas, connecting other inlet to tube furnace and ultrasonically atomizing mixed fogged bead. USE - The method is useful for preparing graphene/silica-carbon composite material using microcrystalline graphite as carbon source. ADVANTAGE - The method has large reversible capacity, good cycle performance, high current discharge capability and high tap density. DETAILED DESCRIPTION - Preparing graphene/silica-carbon composite material using microcrystalline graphite as carbon source comprises (i) mixing 0.5-5 mu m microcrystalline graphite powder with not less than 99% carbon and 1-10 mg/ml graphene oxide in the ratio 1:1-2 to obtain a mixed solution; (ii) adding dispersant to mixed solution, 1 wt.% graphite fine powder, ultrasonically dispersing to form a suspension, adding into three-necked flask, placing on ultrasonic atomizer for ultrasonic atomization at a frequency of 20000 Hz for 30 minutes to form a mixed mist bead; (iii) sealing one mouth of three-necked flask in step (ii) with a rubber plug, connecting one inlet to inert gas, connecting other inlet to a tube furnace and ultrasonically atomizing mixed fogged bead, carrying out vapor deposition in a tube furnace under the protection of an inert gas, performing vapor deposition on a copper foil substrate, placing horizontally in a tube furnace and turning off ultrasonic atomizer after depositing at 400 degrees C for 1 hour; and (iv) heating tube furnace to 800 degrees C at a rate of 5 degrees C/minutes and opening rubber flask of three-necked flask and adding benzene (50%) and trimethylchlorosilane mixed solutions (50%), plugging rubber stopper, turning on ultrasonic atomizer and ultrasonically atomizing at a frequency of 20000 Hz, passing mixed mist beads into tube furnace, turning off ultrasonic atomizer, vapor-depositing mixed mist beads in tube furnace, taking out after 6 hours and cooling to room temperature, where in the steps (iii) and (iv), maintaining flow of inert gas in three-necked flask at 500 ml/minutes and purifying microcrystalline graphite.