MoS2 Decorated Fe3O4/Fe1–xS@C Nanosheets as High-Performance Anode Materials for Lithium Ion and Sodium Ion Batteries

Fe3O4/Fe1–xS@C@MoS2 nanosheets consisting of Fe3O4/Fe1–xS nanoparticles embedded in carbon nanosheets and coated by MoS2 were synthesized via a facile and scalable strategy with assistance of NaCl template. With Fe3O4/Fe1–xS@C@MoS2 nanosheets composite as an anode for LIBs and SIBs, the Fe3O4/Fe1–xS@C@MoS2 nanosheets composite shows outstanding electrochemical performance because of the synergistic effects of the Fe3O4/Fe1–xS nanoparticles, carbon nanosheets and MoS2. In this unique constructed architecture, on one hand, the carbon nanosheets can avoid the direct exposure of Fe3O4/Fe1–xSNPs to the electrolyte; on the other hand, the carbon nanosheets can buffer the volume change of Fe3O4/Fe1–xS NPs as well as suppress the aggregation of Fe3O4/Fe1–xS NPs during the cycling processes. Moreover, MoS2 can offer high interfacial contact areas between active materials/electrolyte, resulting in rapid charge transfer and higher capacity. As a consequence, Fe3O4/Fe1–xS@C@MoS2 nanosheets exhibit high reversible capacity of 1142 mAhg–1 after 700 cycles at 1.0 A g–1 and 640 mA h g–1 at 5.0 A g–1for LIBs, 402 mA h g–1 after 1000 cycles at 1.0 A g–1and 355 mA h g–1 at 2.0 A g–1 for SIBs, respectively. This outstanding electrochemical performance indicated that the Fe3O4/Fe1–xS@C@MoS2 nanosheets have potential as anode for high-performance LIBs and SIBs.