▎ 摘　　要

NOVELTY - Graphene quantum dot-biological active carbon composite material comprises biological active carbon. The surface of the bio biological active carbon is connected to the graphene quantum dots by hydrogen bonding. The biological active carbon is a micro mesoporous structure and the micro-mesoporous structure physically adsorbs graphene quantum dots. USE - The material is useful for preparing lithium battery cathode and preparing lithium battery (claimed). ADVANTAGE - The material has higher discharge specific capacity, high coulomb capacity, and better rate performance and conductivity and exhibits good cycle performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing graphene quantum dot-biological active carbon composite material, comprising (i) dissolving and dispersing the graphene quantum dots to obtain dispersion, (ii) adding biological active carbon into the dispersion, mixing, heating, and drying, and (iii) calcining the dried sample of step (ii); (2) a lithium battery cathode material, comprising the graphene quantum dot-biological active carbon composite material; and (3) a lithium battery, comprising the lithium battery cathode and graphene quantum dot-biological active carbon composite material.