Few-layered SnS₂ on few-layered reduced graphene oxide as Na-ion battery anode with ultralong cycle life and superior rate capability

Na-ion Batteries have been considered as promising alternatives to Li-ion batteries due to the natural abundance of sodium resources. Searching for highperformance anode materials currently becomes a hot topic and also a great challenge for developing Na-ion batteries. In this work, a novel hybrid anode is synthesized consisting of ultrafine, few-layered SnS₂ anchored on few-layered reduced graphene oxide (rGO) by a facile solvothermal route. The SnS₂/rGO hybrid exhibits a high capacity, ultralong cycle life, and superior rate capability. The hybrid can deliver a high charge capacity of 649 mAh g^-1 at 100 mA g^-1. At 800 mA g^-1 (1.8 C), it can yield an initial charge capacity of 469 mAh g^-1, which can be maintained at 89% and 61%, respectively, after 400 and 1000 cycles. The hybrid can also sustain a current density up to 12.8 A g^-1 (≈28 C) where the charge process can be completed in only 1.3 min while still delivering a charge capacity of 337 mAh g^-1. The fast and stable Na-storage ability of SnS₂/rGO makes it a promising anode for Na-ion batteries.