Graphene dispersion

Abstract

A graphene dispersion is provided. The graphene dispersion is formed by a graphene powder and a processing solvent, wherein the graphene in the graphene dispersion has an average diameter of 0.5 μm to 1 μm, 3 to 5 layers, a solid content of 5% to 50%, and a residue oxygen content less than 1 wt %, and after being left to stand for 12 hours, the graphene dispersion has a distribution concentration increasing from the top section to the bottom section of the storage container, a viscosity of 5000 cps to 8000 cps, and a graphene concentration of 20 wt %.

What is claimed is: 
     
         1 . A graphene dispersion formed by a graphene powder and a processing solvent, wherein a graphene in the graphene dispersion has an average diameter of 0.5 μm to 1 μm, 3 to 5 layers, a solid content of 5% to 50%, and a residue oxygen content less than 1 wt %, and after being left to stand for 12 hours, the graphene dispersion has a concentration distribution increasing from a top section to a bottom section in a storage container, a viscosity of 5000 cps to 8000 cps, and a graphene concentration of 20 wt %. 
     
     
         2 . The graphene dispersion of  claim 1 , wherein a concentration difference between the top section and the bottom section in the storage container is 0.1 wt % to 20 wt %. 
     
     
         3 . The graphene dispersion of  claim 1 , wherein the graphene powder has 5 to 10 layers. 
     
     
         4 . The graphene dispersion of  claim 1 , wherein an average diameter of the graphene powder is 3 μm to 15 μm. 
     
     
         5 . The graphene dispersion of  claim 1 , wherein a residue oxygen content of the graphene powder is less than 0.1 wt %. 
     
     
         6 . The graphene dispersion of  claim 1 , wherein the processing solvent comprises a hydrocarbon solvent, a halogenated hydrocarbon solvent, an alcohol solvent, a phenol solvent, a ketone solvent, an ester solvent, an ether solvent, an acetal solvent, an acid solvent, an acid anhydride solvent, a nitrogen-containing compound solvent, or a sulfur-containing compound solvent. 
     
     
         7 . The graphene dispersion of  claim 1 , wherein the processing solvent has an interfacial tension of 15 mN/m to 50 mN/m and a Hansen solubility parameter of 5.0 MPa 0.5  to 15 MPa 0.5 . 
     
     
         8 . The graphene dispersion of  claim 1 , wherein based on a total weight of the graphene dispersion, an amount of the graphene powder is 0.001 wt % to 30 wt %. 
     
     
         9 . The graphene dispersion of  claim 1 , wherein the processing solvent has a polar force parameter of 0.5 MPa 0.5  to 5.5 MPa 0.5 , a dispersing power parameter of 7.0 MPa 0.5  to 9.0 MPa 0.5 , and a hydrogen bond force parameter of 2.0 MPa 0.5  to 7.0 MPa 0.5 .