▎ 摘　　要

NOVELTY - Method for preparing thin-layer graphene negative active material using antibiotic residue involves (i) performing hydrothermal liquefaction of the aqueous solution containing antibiotic bacteria residue and alkali, and solid-liquid separation to obtain bacteria residue solution, (ii) heat treating by adding a transition metal source to the bacterial residue solution, and performing dehydration treatment after liquid phase mixing, where the heat treatment involves performing first-stage pretreatment at 400-600 degrees C and the second-stage heat treatment at 700-900 degrees C at a heating rate of2-10 degrees C/minutes, and (iii) washing and drying the product obtained by the heat treatment in the step (ii) to obtain the thin-walled graphene. USE - The method is used for preparing a thin-layer graphene negative active material, which is used as a negative electrode active material of a lithium ion battery (all claimed). ADVANTAGE - The method realizes the high-efficiency utilization of the waste material, and produces graphene negative electrode material with high thin wall and high electrochemical performance through parallel production. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) the thin-layer graphene negative electrode active material prepared by the method, where the thin-layer graphene is doped with heteroatoms such as nitrogen, oxygen, phosphorus and sulfur, and has hierarchical pore structure of micropores, mesopores and macropores; and (2) a lithium ion battery comprising thin-layer graphene negative electrode active material, where the negative electrode of the lithium ion battery comprises the thin-layer graphene negative electrode active material, and the negative active material of the lithium ion battery is the thin-layer graphene negative active material.