Chemical Reagents

A new strategy for preparing graphene/Si/SiO_x(G/Si/SiO_x) nanocomposites is explored. A graphene oxide(GO)suspension was prepared using an improved Hummers method; an HSQ/GO precursor was prepared via an in situ sol-gel method,with triethoxysilane as the silicon source reacting with GO under acidic conditions,and was subsequently thermally reduced in an H₂/Ar mixed gas environment.The research team conducted a detailed analysis of the synthesis mechanism,crystal structure,and electrochemical properties of this nanocomposite material. The prepared composite material had a unique nanoscale structure,which not only effectively addresses the volume expansion problem of Si nanoparticles during charge-discharge cycles,but also provided fast electron transmission path.Cyclic voltammetry tests showed that the oxidation-reduction peak spacing and polarization degree of the G/Si/SiO_x-2 electrode were smaller,and the peak shape was more stable during the cycling process,demonstrating good electrochemical reversibility. When this composite material was used as the negative electrode material for lithium-ion batteries,it exhibited high initial reversible capacity,excellent rate performance,and long-term cycling stability,all of which reflect its outstanding lithium storage capacity. A G/Si/SiO_x nanocomposite material with synergistically optimized structure and performance was successfully prepared.Its core advantage lies in the synergistic effect of its component.Graphene,as a conductive skeleton and volume buffer layer,not only provides a continuous electron transfer channel,but also effectively alleviates the volume expansion of Si during charge-discharge processes.This study not only provides a solid theoretical and experimental foundation for the application of graphene reinforced nanometal materials in the field of energy storage,but also opens up new research avenues and perspectives for the development of a next-generation of high-performance lithium-ion battery negative electrode materials.