Fe3O4/RGO modified separators to suppress the shuttle effect for advanced lithium-sulfur batteries

A modified separator by a composite of Fe3O4 nanoparticles and reduced graphene oxide (RGO) sheets is designed as an efficient polysulfides barrier and an upper current collector to suppress shuttle effect and improve utilization of the active material for lithium-sulfur batteries (LSBs). The RGO sheets can block lithium polysulfides (LiPSs) and transport electrons. The polar Fe3O4 nanoparticles significantly inhibit the dissolution of LiPSs to the electrolyte through strong chemical interactions. As a result, LSBs with such a separator exhibit high discharge capacities and excellent cycling stability.