Work

SnO2SnS2/graphene heterojunction composite promotes high-performance sodium ion storage

Year: 2024

Type: article

Abstract: The design of electrode material nanostructures including reducing material sizes and designing appropriate heterostructures , has great potential in improving charge storage dynamics and enhancing practical performance. In this study, we present the innovative synthesis of SnO 2 SnS 2 /graphene heterojunction composite materials via a controlled vulcanization reaction process. The unique structure endows the composite with high electronic conductivity , rapid ion diffusion rates, elevated electrochemical activity, excellent structural stability, and abundant reaction sites, making it a highly efficient anode material for sodium-ion batteries (SIBs). Half-cell tests demonstrate that the SnO 2 SnS 2 /r–G composite achieves a first Coulombic efficiency of 77.3% at a high current density of 5 A/g, showing remarkable cycling stability. Remarkably, the composite retains a reversible capacity of 330 mA⋅h/g after 1000 cycles, with a capacity retention rate of 77.5%. Moreover, we elucidate the specific sodium storage mechanisms of the heterojunction composite electrode via in-situ and ex-situ characterization methods. Furthermore, a full battery utilizing Na 0.53 MnO 2 as the cathode and SnO 2 SnS 2 /r–G composite as the anode exhibits outstanding rate performance and long-term cycling stability. This method of heterostructure design and fabrication, coupled with the exceptional performance metrics, suggests that the SnO 2 SnS 2 /r–G heterostructure is a promising candidate for advanced anode materials in SIBs applications.

Source: Journal of Materiomics

DOI: 10.1016/j.jmat.2024.100983