▎ 摘　　要

NOVELTY - A positive electrode active material composite comprises a core portion containing a positive electrode active material, and a shell portion comprising one or more layers of reduced graphene oxide formed to surround the core portion. USE - Active material composite is used for forming positive electrode of battery e.g. secondary battery (all claimed) e.g. lithium secondary batteries. ADVANTAGE - The positive electrode active material composite has excellent efficiency, longlife, electroconductivity and ionic conductivity, high charge/discharge capacity and energy density, and suppressed internal resistance and side reaction of between the positive electrode active material and the electrolyte. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: econdary battery electrode; and econdary battery.