▎ 摘　　要

NOVELTY - The preparation method of high-concentration environmentally-friendly and ultra-clean graphene dispersion liquid involves expanding graphite or graphite intercalation compounds as raw materials using thermal expansion method or chemical expansion method to weaken the interaction force between graphite layers, then using pi -anion and cation interaction in ionic liquid and stripping under the action of mechanical force. USE - The method is useful for preparing high-concentration environmentally-friendly and ultra-clean graphene dispersion liquid (claimed). ADVANTAGE - The method enables simple preparation of high-concentration environmentally-friendly and ultra-clean graphene dispersion liquid with high yield.