Polycrystalline Fe- and Sn-based sulfides for high-capacity sodium-ion battery anodes.

Nano-polycrystalline Sn2S3/Sn3S4/FeS/Fe7S8 sulfides anchored on graphene were synthesized via annealing SnS2 and Fe followed by homogeneously combining them with exfoliated graphite. When applied as an anode for a sodium-ion battery, the reversible capacity reached 863 mA h g−1 at 100 mA g−1. This facial materials synthesis method may be applied in various fields. [ABSTRACT FROM AUTHOR]