由于锂资源短缺,我们尝试使用三氧化钼作为钠离子储能装置负极材料.通过一种简单的方法合成了三氧化钼,使用XRD、SEM和TEM等测试手段对其物性进行了表征.利用三氧化钼作为有机系钠离子储能器件的负极材料,通过循环伏安和恒流充放电测试探讨了负极材料的储钠机理.以三氧化钼(MoO3)作为负极材料,活性炭(AC)和石墨(graphite)作为正极材料,组装成新型的电化学储能器件,研究了两种器件在1 mol/L NaPF6的碳酸丙烯酯(PC)中的电化学性能.两种器件的电压范围分别为0～3.2V和0～3.5V,能量密度最高可分别达到31.6和53Wh/kg,长循环性能远远优于AC/AC对称电容器.此种储能装置有望成为锂离子电池的一个很好的替代.
Owing to the shortage of lithium resources,we investigated the sodium-ion storage device using MoO3 as the negative electrode materials.MoO3 was prepared through a simple method and characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM) and transmission electron microscopy(TEM).MoO3 was used as the negative electrode materials for electric energy storage devices using Na +-based organic electrolytes.The charge storage mechanism at the MoO3 negative electrode was investigated by cyclic voltammetry and galvanostatic charge-discharge tests.A new type of electric energy storage devices was constructed with MoO3 as negative materials and activated carbon (or graphite) as positive materials.The electrochemical properties were studied in 1 mol/L NaPFr-propylene carbonate (PC).The MoO3/AC and MoO3/graphite devices owns the voltage ranges of 0 ～3.2 V and 0 ～ 3.5 V,energy densities of 31.6 Wh/kg and 53 Wh/kg,respectively.The long-cycling stabilities of both devices are superior to the AC/AC symmetric capacitor obviously.This kind of energy storage devices would be a good substitute for lithium-ion batteries.
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