Method for preparing graphene by using high speed homogenization pretreatment and high pressure homogenation
AssigneeLG Chem, Ltd.
InventorsSeung Bo Yang, Kwon Nam Sohn, Won Jong Kwon, Se Ho Park, Mi Jin Lee
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Abstract
The present invention relates to a method for preparing graphene which comprises subjecting expanded graphite to high speed homogenization to prepare a feed solution and then subjecting the same to high pressure homogenization, thereby increasing the degree of dispersion of expanded graphite in the feed solution and so improving the efficiency of high pressure homogenization. Therefore, the present method has features that the efficiency of graphene preparation is excellent and the size of graphene to be prepared is uniform, compared with a conventional process.
Claims11
A method for preparing graphene comprising:
- a step of subjecting a dispersion solution containing expanded graphite and a dispersant to high speed homogenization to prepare a feed solution (step 1);
- and
- a step of passing the feed solution through a high-pressure homogenizer including an inlet, an outlet, and a micro-channel that connects between the inlet and the outlet and has a diameter in a micrometer scale (step 2),
- wherein the weight ratio of the expanded graphite and the dispersant is 2.5 to 20, and
- the high-speed homogenization is carried out by stirring the dispersion solution at 3000 to 8000 rpm.
Dependencies are inferred from the claim text.