▎ 摘　　要

NOVELTY - Preparing nano tin-carbon composite material comprises (1) dissolving tin source in water to obtain solution 1, dissolving ligand compound in water to obtain solution 2, (2) mixing solution 1 and solution 2, (3) adding graphene oxide aqueous solution to the mixed solution of solutions 1 and 2 and stirring, and adding reducing agent solution to carrying out reduction reaction, and (4) centrifuging, washing, and freeze-drying obtained product to obtain composite material. USE - The method is useful for preparing nano tin-carbon composite material, which is useful for sodium-ion battery cathode, and in field of electrochemical energy storage material. ADVANTAGE - The material exhibits very high electrochemical sodium storage capacity, has good cycle stability. The method adopts cheap and easy avialble raw materials, is simple, environmentally friendly and does not need high temperature treatment process, and has low energy consumption. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a nano tin-carbon composite material.