NANOPARTICLE-GRAPHENE-CARBON COMPOSITE HAVING GRAPHENE NETWORK FORMED THEREIN, PREPARATION METHOD THEREFOR AND APPLICATION THEREOF

摘要

The present invention relates to a nanoparticle-graphene-carbon composite having a graphene network formed therein and, more specifically, to an electrode using a nanoparticle-graphene-carbon composite having a graphene network formed therein by dispersing graphene between nanoparticles coated with carbon within the composite, a secondary battery comprising the same, and an electric power storage apparatus comprising the same. The nanoparticle-graphene-carbon composite according to the present invention includes graphene having excellent conductivity and mechanical elasticity and a remarkably large specific surface area, which is uniformly dispersed within the composite, thereby absorbing changes in volume according to charging/discharging, and forming an electrically conductive network within the composite, and thus can be used as an electrode material of a secondary battery having high capacity and a remarkably extended cycle lifespan. In particular, the preparation method of the present invention allows easy mass-production by a sol-gel method.