SnS₂ Nanosheets with RGO Modification as High-Performance Anode Materials for Na-Ion and K-Ion Batteries

To date, the fabrication of advanced anode materials that can accommodate both Na⁺ and K⁺ storage is still very challenging. Herein, we developed a facile solvothermal and subsequent annealing process to synthesize SnS₂/RGO composite, in which SnS₂ nanosheets are bonded on RGO, and investigated their potential as anodes for Na⁺ and K⁺ storage. When used as an anode in SIBs, the as-prepared SnS₂/RGO displays preeminent performance (581 mAh g^-1 at 0.5 A g^-1 after 80 cycles), which is a significant improvement compared with pure SnS₂. More encouragingly, SnS₂/RGO also exhibits good cycling stability (130 mAh g^-1 at 0.3 A g^-1 after 300 cycles) and excellent rate capability (520.8 mAh g^-1 at 0.05 A g^-1 and 281.4 mAh g^-1 at 0.5 A g^-1) when used as anode for PIBs. The well-engineered structure not only guarantees the fast electrode reaction kinetics, but also ensures superior pseudocapacitance contribution during repeated cycles, which has been proved by kinetic analysis.