Preparation and electrochemical properties of NaZnV2(PO4)3/C as anodes for sodium-ion batteries

Sodium ion batteries is regarded as promising energy storage devise for large scale application. Essentially, highly reversible anode material is critical to promote its commercialization. Herein, new Zn-substituted NaZnV2(PO4)3/C nano composites were synthesized by a facile sol-gel method and the influence of the synthesizing temperature on the phase composition, morphology and sodium-storage properties were investigated. The material synthesized at 800 °C showed the best cyclability and rate capability in the voltage range of 0.05 – 3.0 V. A high reversible capacity of 107 mAh g−1 was obtained at 2C, with a high capacity retention of 98% cycles after 100 cycles. The average working potential is around 1.0 V, makes it a promising candidate as an anode material for sodium-ion batteries.