Preparation method of CaF2 modified sodium ferric pyrophosphate type sodium ion battery positive electrode material

The invention discloses a preparation method of a CaF2 modified sodium ferric pyrophosphate type sodium ion battery positive electrode material. According to the invention, CaF2 is used for modifying the sodium ferric pyrophosphate type sodium ion battery positive electrode material, so that the problems of poor conductivity, high humidity sensitivity and serious surface oxidation of Na < 3.12 > Fe < 2.44 > (P2O7) 2/C are improved, and the specific capacity and cycling stability of the sodium ferric pyrophosphate type sodium ion battery positive electrode material are improved. The short cycle charge-discharge specific capacity of the NFPO coated with 3.0 wt% of CaF2 can reach 80.6 mAh.g at 0.5 C, and the capacity retention rate is 88.7% after 100 cycles; and the long-cycle charge-discharge specific capacity of the NFPO coated with 3.0 wt% of CaF2 can reach 55.2 mAh.g at 10 DEG C. 本发明公开了一种CaF2修饰焦磷酸铁钠型钠离子电池正极材料的制备方法。本发明使用CaF2对焦磷酸铁钠型钠离子电池正极材料修饰改性，改善了Na3.12Fe2.44(P2O7)2/C电导率差、高湿敏感性以及严重的表面氧化问题，提高了其比容量