▎ 摘　　要

NOVELTY - Manufacturing metal oxide nanoparticles/graphene composite using supercritical fluid comprises preparing dispersion solution by dispersing graphene oxide and metal oxide precursor in an organic solvent; and forming metal oxide nanoparticles/graphene composite by reacting the dispersion solution at supercritical conditions. USE - The method is useful for metal oxide nanoparticles/graphene composite using supercritical fluid (claimed). ADVANTAGE - The method is simple removing oxygen present in graphene by using supercritical conditions in fluid and simultaneously by combining graphene with metal oxide nanoparticles on the surface; produces environmentally friendly without the use of harmful reducing agent or toxic organic solvents; easily control metal oxide nanoparticles coupled to graphene particle by adjusting the amount of metal oxide precursor. The composite has electrical conductivity and excellent charge and discharge efficiency when applied to a lithium secondary battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) metal oxide nanoparticles/graphene composite prepared by the above method; and (2) a negative electrode active material comprising metal oxide nanoparticles/graphene composite.