Graphene aqueous dispersion and preparation method thereof

Abstract

The present invention discloses a graphene aqueous dispersion and a preparation method thereof, the graphene aqueous dispersion comprises a nano graphene sheet, water, at least one nonionic dispersant and at least one thickener, the concentration of the nano graphene sheet is 0.01-15 wt%, the bulk density of the nano graphene sheet is 0.01-0.03 g / cm < 3 >, the thickness of the nano graphene sheet is 0.34-5 nm, the sheet diameter of the nano graphene sheet is 1-50 [mu] m, and the thickness of the nano graphene sheet is 1-10 [mu] m. The ratio I2D / IG of the 2D peak to the G peak of the Raman spectrum of the nano graphene sheet is greater than 0.5, and the ratio ID / IG of the D peak to the G peak is less than 0.2; the thickening agent comprises hydrophilic aerogel, and the graphene aqueous dispersion is excellent in dispersity, good in stability, not prone to re-agglomeration, free of toxic substances and suitable for being added and used in various acidic and alkaline solutions.

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