One-Step Synthesis of 3D-Sandwiched Na3V2(PO4)(2)O2F@rGO Composites as Cathode Material for High-Rate Sodium-Ion Batteries

摘要

Na3V2(PO4)(2)O2F@reduced graphene oxide composites are rapidly synthesized by one-step microwave-assisted hydrothermal method within 1h without any following energy-consuming process. The composite shows a three-dimensional sandwiched structure with carbon wrapping and is applied as cathode material for sodium-ion batteries. It delivers a reversible capacity of 100.5 mAhg(-1) and a capacity retention rate of 84.9% at 20C after 2000 cycles, exhibiting excellent rate capability and cyclability. This superior electrochemical performance is attributed to the synergetic effect from the enhanced electronic conductivity and the improved electrochemical kinetic behavior.