Few‐Layered SnS₂ on Few‐Layered Reduced Graphene Oxide as Na‐Ion Battery Anode with Ultralong Cycle Life and Superior Rate Capability

Abstract

Na‐ion Batteries have been considered as promising alternatives to Li‐ion batteries due to the natural abundance of sodium resources. Searching for high‐performance 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 SnS 2 anchored on few‐layered reduced graphene oxide (rGO) by a facile solvothermal route. The SnS 2 /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 SnS 2 /rGO makes it a promising anode for Na‐ion batteries.