▎ 摘　　要

NOVELTY - Preparation of ultra-high-thermal conductivity graphene thick film involves washing (i) a graphite oxide until becomes neutral, mixing deionized water, ultrasonically processing to strip graphene oxide and stirring to obtain a graphene oxide hydrosol, adding (ii) an acidic electrolyte solution to the graphene oxide hydrosol to protonate and precipitate graphene oxide to obtain a protonated graphene oxide slurry, adding (iii) a solvent to the graphene oxide slurry to adjust liquid surface energy, injecting (iv) the graphene oxide slurry into a mold container with a nylon mesh at the bottom, maintaining to separate water and air-drying to obtain a graphene oxide thick film, and heat-treating (v) and compacting the graphene oxide thick film. USE - Preparation of ultra-high-thermal conductivity graphene thick film (claimed). ADVANTAGE - The method enables economical and efficient preparation of graphene thick film in short time with improved productivity and reduced energy consumption. The graphene oxide hydrosol is used to protonate graphene oxide under acidic conditions, and liquid surface can be adjusted to achieve orientation and film formation, such the ultra-high thermal conductivity of the graphene thick film can be obtained by reduction. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for ultra-high-thermal conductivity graphene thick film, which has a thickness of 50-300 mu m, a density of 17-2.1 g/cm3, and a thermal conductivity in the plane direction of more than 1500 W/mK. When the thickness of the graphene thick film is more than 300 mu m, the thermal conductivity of the graphene thick film in the plane direction can be maintained above 1000 W/mK. The graphene thick film is a homogeneous material with no delamination and no bubbling on the surface.