▎ 摘　　要

NOVELTY - Preparing water-dispersible graphene slurry comprises (i) dispersing graphite powder in water containing a dispersing agent to obtain an aqueous dispersion of graphite powder; (ii) sulfating the graphite powder in the aqueous dispersion of graphite powder to obtain sulfonated graphite dispersion having a surface bonded to a benzenesulfonic acid group; and (iii) peeling off mechanically the sulfonated graphite dispersion and centrifuging. USE - The method is useful for preparing water-dispersible graphene slurry. ADVANTAGE - The graphene has good water dispersibility and electrical conductivity and can be stored in an ultra-high concentration (100 mg/ml) graphene aqueous slurry without secondary stacking during storage.