NaV_(1-x)Fe_xPO_4F的合成及电化学性能研究

Studies on synthesis and electrochemical performance of NaV_(1-x)Fe_xPO_4F

运用高温固相法合成了钠离子电池正极材料NaV1-xFexPO4F(x=0、0.04和0.06)。通过FTIR、XRD和SEM等方法,对材料的晶体结构和形貌进行了研究。从材料的晶体结构、恒流充放电测试和循环性能等方面,分析了掺杂元素Fe在改善材料性能中的作用。掺Fe后,正极材料的电化学性能得到改善,NaV0.94Fe0.06PO4F(x=0.06)在循环20次后的可逆容量保持率为91.8%。

NaV1-xFexPO4F（x = 0, 0.04, 0.06） as cathode material of sodium-ion battery was prepared by the high temperature solid-phase method. The crystal structure and morphology of the material were studied by FTIR, XRD and SEM methods. The effects of the doped dement Fe on improving the performance of the material were analyzed in terms of the crystal structure, galvanostatic charge-discharge test and cycle performance. The electrochemical performance of cathode material improved after the doping of Fe, the capacity retention of NaV0.94Fe0.06PO4F（ x = 0.06） was 91.8% after 20 cycles.