A simple synthesized N-doped FeS2/Fe3O4@C nanocomposite as anode for sodium ion batteries

Abstract In this work, the nanocomposite of N-doped carbon layer wrapped FeS2/Fe3O4 nanoparticles (FeS2/Fe3O4@C) is successfully prepared via a simple method. By combining small grain diameter (about 100 nm), the promotion of N atoms and buffering of carbon layer, when evaluated as anode material for sodium ion batteries (SIBs), the FeS2/Fe3O4@C nanocomposite exhibits superior reversible capacity of 670 mAh g−1 and satisfied cycling stability (98.6% capacity retention) after 250 reversible discharge/charge cycles, also excellent rate capability (330 mAh g−1 at 10 A g−1). Benefiting from the easy synthesis route and excellent electrochemical performance, FeS2/Fe3O4@C shows great potential for SIBs’ large-scale application.