SnS(2) 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 SnS(2)/RGO composite, in which SnS(2) 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 SnS(2)/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 SnS(2). More encouragingly, SnS(2)/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.