▎ 摘　　要

NOVELTY - A graphene/rare earth oxide nanometer composite material is obtained by uniformly dispersing nano rare earth oxide particle on the surface of a nanometer graphene sheet by being formed into nanometer level particles, where the particle size is 5-50 nm, and the sheet thickness is 1-5 layers, and the nano rare earth oxide is yttrium oxide or lanthanum oxide. USE - Graphene/rare earth oxide nanometer composite material for use in a lithium ion battery. ADVANTAGE - The material can be prepared in a simple, cost-effective and short period manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing graphene/rare earth oxide nanometer composite material, which involves uniformly mixing oxidized graphene dispersion liquid and a soluble rare earth compound at the weight ratio of (1:1)-(1:10), regulating a pH value to alkalescence, and carrying out hydrothermal reaction to obtain the graphene-rare earth oxide nanometer composite material, and uniformly mixing the oxidized graphene dispersion liquid and the soluble rare earth compound at the weight ratio of (1:1)-(1:10), adding a reducer, and carrying out reflux reaction at certain temperature to obtain the graphene-rare earth oxide nanometer composite material.