三氧化钼——一种新型有机系钠离子储能器件负极材料

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1mol/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53 Wh/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。

Molybdenum Trioxide:A New Type Negative Electrode Material for Electric Energy Storage Devices Using Na+-based Organic Electrolytes

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 NaPF₆-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.