Graphene nanosheets wrapped on SnO 2 -CuS nanoparticles as high- performance anode materials for lithium-ion batteries

Abstract The synthesis of the ternary composite nanomaterial, SnO₂-CuS-Graphene, involved a combination of hydrothermal and ball-milling techniques. Within the composite structure, the SnO2-CuS composite nanomaterials are evenly adhered to the Graphene, effectively shortening the diffusion pathways for electrons and Li⁺. This results in reduced volume fluctuations of the electrode during cycling, ultimately amplifying the conductivity of the hybrid material and offering plentiful active sites for lithium absorption. As a result, the SnO₂-CuS-Graphene composite nanomaterial demonstrates exceptional electrochemical performance, achieving an impressive reversible capacity of 1106.7 mAh g⁻ ¹ after 200 cycles at 0.2 A g⁻ ¹ and maintaining a high reversible capacity of 991 mAh g–¹ after 1000 cycles at 1.0 A g⁻ ¹. These results underscore its remarkable cycling stability and substantial reversible capacity.