▎ 摘　　要

NOVELTY - Preparation of a three-dimensional (3D) graphene/silicon oxide composite material involves (S1) preparing three-dimensional graphene oxide by mixing graphite, water, concentrated sulfuric acid and sodium vanadate, followed by hydrothermal, ultrasonic and impurity removal to obtain a mixed dispersion, and finally drying to obtain three-dimensional graphene oxide, and (S2) preparing 3D graphene/silicon oxide composites by (S21) mixing the three-dimensional graphene oxide, water, potassium sulfide and potassium ferrate to obtain a reduced three-dimensional graphene dispersion, and performing stirring, ultrasonication, leaving the dispersion and drying to obtain the reduced three-dimensional graphene, (S22) mixing the reduced three-dimensional graphene, silicon oxide powder and water, ultrasonically processing and drying to obtain a mixed material and (S23) laser processing the mixed material to obtain a three-dimensional graphene/silicon oxide composite material. USE - Preparation of a three-dimensional graphene/silicon oxide composite material used for preparing electrode material (all claimed). ADVANTAGE - The method synthesis three-dimensional graphene/silicon oxide composite material by doping the binding elements through a combined method of multi-step hydrothermal-laser etching, and provides lithium-ion battery with coulombic efficiency, cycle life and reversible capacity under high load.