Modification of Sodium Vanadate Cathode by Zr4+Doping
Zr4+-doped hollow spherical Na3V2(PO4)3 cathode material was prepared by spray drying method,and the influence of different Zr4+doping levels(molar ratio of Zr4+to Na3-xV2-xZrx(PO4)3)on the material properties was investigated.Techniques such as X-ray diffraction(XRD),scanning electron microscopy(SEM),and in-situ XRD were used to analyze the effects of Zr4+doping on the structure and electrochemical performance of the material.It can be observed that Zr4+doping enhanced the structural stability of the material,effectively inhibiting structural collapse and volume expansion during cycling.When the Zr4+doping level was 0.15,Na2.85V1.85Zr0.15(PO4)3(NVZP-15)demonstrated a discharge specific capacity of 76.5 mA·h/g at 15.0 C,with a capacity retention of 80.6%after 800 cycles at 10.0 C.
Sodium ion batteriesNa3V2(PO4)3Electrochemical propertiesZr4+doping amountSpray drying
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