▎ 摘　　要

NOVELTY - Nano-bracelet ferric oxide/graphene quantum dot/tin dioxide core shell structure composite material is prepared by (1) adding an iron source to water, continuously adding a pH buffering agent, mixing and stirring and performing hydrothermal reaction to obtain nano-bracelet ferric oxide, (2) dispersing obtained nano-bracelet ferric oxide in water, adding a graphene quantum dot solution, dispersing and performing the hydrothermal reaction to obtain graphene quantum dot ferric oxide, (3) dispersing obtained graphene quantum dot ferric oxide in a solvent, stirring, adding aqueous water and a silicon source, mixing and performing stirring reaction to obtain the nano-bracelet graphene quantum dot ferric oxide/silicon dioxide composite nanomaterial composite material and (4) dispersing the nano-bracelet graphene quantum dot ferric oxide/silicon dioxide composite nanomaterial composite material in a solvent, adding urea and a tin source, stirring and performing the hydrothermal reaction. USE - The core shell structure composite material is useful for manufacturing a lithium-sulfur battery (claimed). ADVANTAGE - The core shell structure composite material adopts the hollow nano-bracelet core-shell structure that contain more sulfur active substances during sulfur fumigation and can effectively alleviate the problem of sulfur volume expansion during the charging and discharging process, adsorbs graphene quantum dots in the material, has improved stability and conductivity and ability to adsorb polysulfides, is beneficial to alleviate the volume change of sulfur and inhibits the shuttle effect.