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Keywords:

  • Na3V2(PO4)3;
  • sodium-ion batteries;
  • storage mechanism;
  • in situ XRD
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A Na3V2(PO4)3/C composite with 3.8 wt.% carbon, which was synthesized by a one-step solid state reaction, exhibits Na storage capacity of 107 mAh g−1 and high coulombic efficiency of 99.8% in a new NaFSI/PC electrolyte. In situ XRD results reveal its sodium storage mechanism as a typical two-phase reaction from the Na3V2(PO4)3 to NaV2(PO4)3 phases with 8.26% volume variation. These desired properties make it very promising for application in room-temperature sodium- ion batteries.