▎ 摘　　要

NOVELTY - Positive electrode active material-graphene composite particles are composite particles formed by conjugating positive electrode active material particles and matrix containing graphene, and have functionalization rate of 0.15-0.8 calculated from measured value by X-ray-photoelectron-spectroscopy measurement using specified relation (i). USE - Positive electrode active material-graphene composite particles is used as positive electrode material of lithium-ion battery (claimed) for mobile telephone and laptop computer, electric vehicle and hybrid electric vehicle. ADVANTAGE - The positive electrode active material-graphene composite particles have high electron conductivity and ionic conductivity, and is capable of providing favorable cell performance. The lithium ion secondary battery using the positive electrode active material-graphene composite particles has high capacity and power. DETAILED DESCRIPTION - Positive electrode active material-graphene composite particles are composite particles formed by conjugating positive electrode active material particles and matrix containing graphene, and have functionalization rate of 0.15-0.8 calculated from measured value by X-ray-photoelectron-spectroscopy measurement using relation: functionalization rate=((peak area based on C-O single bond)+(peak area based on C=O double bond)+(peak area based on COO coupling))/(peak area based on C-C, C=C and C-H coupling) (i). INDEPENDENT CLAIMS are included for the following: (1) lithium-ion battery positive electrode material; and (2) manufacture of positive electrode active material-graphene composite particles.