One-step pyrolysis synthesis of octahedral Fe3O4/C nanocomposites as superior anodes for sodium-ion batteries

Fe3O4/C nano-octahedra with a diameter of 300–500 nm have been successfully synthesized by a simple pyrolysis method. The Fe3O4/C displayed superior reversible capacity, rate capability and cycling performance as an anode for sodium-ion batteries. At a current density of 100 mA g−1, a large capacity of 380 mA h g−1 was still achieved after 60 cycles.