微乳液法合成Fe0．94 Mn0．06 PO4＠MCNT钠离子电池正极材料∗

摘要

采用微乳液法合成了 Fe0．94 Mn0．06 PO4＠MCNT 钠离子电池正极材料。采用 XRD 和 SEM/EDS对材料的结构、表面形貌及成分进行了分析。采用电化学测量方法对组装的钠离子电池进行恒流充放电和电化学阻抗谱的测试。结果表明,Fe0．94 Mn0．06 PO4＠MCNT复合材料以0．1,0．2,0．5和1．0 C 倍率在电化学窗口1．5~4．2 V 充放电,放电比容量分别达160．6,147．9,137．5和106．8 mAh/g。Fe0．94 Mn0．06 PO4＠MCNT 电化学性能比 FePO4＠MCNT 和纯的 Fe-PO4有明显提高。%Fe0.94 Mn0.06 PO4@MCNT was prepared by micro-emulsion technique.The structure of sample was ana-lyzed by XRD.The analysis of morphology and composition were carried by SEM/EDS,the electrochemical per-formance of assembled sodium ion battery was tested by galvanostatic discharge/charge tests and electrochemi-cal impedance spectra (EIS).The result show that the discharge specific capacity of this cathode material was up to 160.6,147.9,137.5,106.8 mAh/g at 0.1,0.2,0.5,1 C in electrochemical window of 1.5-4.2 V.Compared with FePO4@MCNT and FePO4 ,there was obvious improvement in electrochemical performance.