▎ 摘　　要

NOVELTY - Preparing flexible high-conductivity graphene and carbon nano tube composite current collector comprises e.g. (i) using carbon nanotube subjecting to surface oxidation treatment with nitric acid, (ii) mixing the pretreated carbon nanotube and the graphene oxide, ultrasonically dispersing and filtering, (iii) taking the graphene oxide and the carbon nanotube composite film subjecting to high vacuum and high temperature annealing and reduction in a mixed atmosphere of hydrogen and argon gas to obtain graphene and carbon nanotube composite membrane; and (iv) naturally cooling composite membrane. USE - The method is useful for preparing flexible high-conductivity graphene and carbon nano tube composite current collector (claimed). ADVANTAGE - The method can greatly improves the specific surface area of the current collector and improves the adhesion between the current collector and the active electrode material, reducing the resistance of the device and effectively preventing the electrode active material from falling off from the current collector. DETAILED DESCRIPTION - Preparing flexible high-conductivity graphene and carbon nano tube composite current collector comprises (i) using carbon nanotube subjecting to surface oxidation treatment with nitric acid to obtain pretreated carbon nanotube, (ii) mixing the carbon nanotube pretreated in step (i) and the graphene oxide, ultrasonically dispersing for 5-8 hours and filtering to a thickness of not less than 1 cm to form the composite membrane of graphene oxide and carbon nanotube; where the mass ratio of carbon nanotube and graphene oxide is 1:10-1:20, (iii) taking the resulting graphene oxide and the carbon nanotube composite film subjecting to high vacuum and high temperature annealing and reduction in a mixed atmosphere of hydrogen and argon gas to obtain graphene and carbon nanotube composite membrane; the volume ratio of hydrogen and argon gas is 1:4-8; the total flow rate of the mixed gas of hydrogen and argon is 5-20 sccm; the vacuum degree of the high vacuum is 50-100 mTorr; the temperature of the high temperature annealing and reduction is 2000-3000 degrees C; the time of the high-temperature annealing and reducing is 30-60 minutes; the temperature raising rate is 1-3 degrees C/minute; and (iv) taking the resulting graphene and carbon nano tube composite membrane for naturally cooling to room temperature, taking out, and along vertical graphite alkene layers stacked in the direction to the graphene and carbon nano tube composite film for cutting into slices, slicing into 10-20 micron thickness to obtain graphene carbon nano tube composite current collector, the graphite alkene carbon nano tube composite collected fluid and surface appearance is graphene and carbon nano tube stacking in a staggered formation height fluctuation of ravine.