Improved Electrochemical Performance Based on Nanostructured SnS(2)@CoS(2)–rGO Composite Anode for Sodium-Ion Batteries

A promising anode material composed of SnS(2)@CoS(2) flower-like spheres assembled from SnS(2) nanosheets and CoS(2) nanoparticles accompanied by reduced graphene oxide (rGO) was fabricated by a facile hydrothermal pathway. The presence of rGO and the combined merits of SnS(2) and CoS(2) endow the SnS(2)@CoS(2)–rGO composite with high conductivity pathways and channels for electrons and with excellent properties as an anode material for sodium-ion batteries (SIBs). A high capacity of 514.0 mAh g(−1) at a current density of 200 mA g(−1) after 100 cycles and a good rate capability can be delivered. The defined structure and good sodium-storage performance of the SnS(2)@CoS(2)–rGO composite demonstrate its promising application in high-performance SIBs. [Image: see text] ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s40820-018-0200-x) contains supplementary material, which is available to authorized users.