Abstract
Na+ superionic conductor (NASICON) type Fe2(MoO4)3 with capacious ion diffusion tunnels and a flat discharge plateau, is a promising cathode material for sodium ion batteries. However, the sluggish electrochemical kinetics limits its further development due to the poor electron conductivity and long Na+ diffusion path. In this work, a graphene wrapped Fe2(MoO4)3 nanoparticle composite was synthesized via a micro-emulsion method followed by annealing. The composite exhibits ultra-high rate capability (64.1mAhg−1 at 100C, better than all the reported works) and good high-rate cycling stability (76% capacity retention after 100 cycles at 10C). The enhanced electrochemical performances are attributed to the unique composite structure with shortened ion diffusion distance and high electron conductivity. Furthermore, the Na+ insertion/extraction mechanism of the composite is systematically investigated, based on in-situ X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Our work demonstrates that the graphene wrapped Fe2(MoO4)3 nanoparticle composite has great potential for high-rate sodium ion batteries.
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