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

• Main Authors: Leqiang Wu, Hengjia Shao, Chen Yang, Xiangmin Feng, Linxuan Han, Yanli Zhou, Wei Du, Xueqin Sun, Zhijun Xu, Xiaoyu Zhang, Fuyi Jiang, Caifu Dong
• Format: Article
• Language: English
• Published: MDPI AG 2021-07-01
• Series: Nanomaterials
• Subjects: SnS₂; anode; sodium-ion batteries; potassium-ion batteries
• Online Access: https://www.mdpi.com/2079-4991/11/8/1932

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.