One-to-one Coating of Graphene nanoflakes on Silicon nanoparticles as Anode for Enhanced-Performance Lithium Ion Batteries
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초록
내용
A Si@Graphene nanoflakes (Si@GNF) core-shell nanocomposite was synthesized for use as a Li-ion battery anode via electrostatic interaction between amine-grafted Si and graphene oxide nanoflakes, followed by thermal annealing to reduce the graphene oxide. The graphene shell effectively mitigates the volumetric changes of Si anodes during cycling and enhances the rate performance of silicon due to its high electrical conductivity of graphene nanoflakes. Moreover, one-to-one graphene nanoflake coating on the Si core especially improves the specific capacity and cycling stability of the anodes, attributed to the structural flexibility and conductivity of graphene. Consequently, the Si@GNF core-shell nanocomposites achieve a stable, reversible capacity of 1350 mAh/g with a high coulombic efficiency (~98%) and excellent rate capability. These outstanding electrochemical properties highlight the potential of Si@GNF as a promising anode material for advanced energy storage systems.