铝二次电池用RGO-S电极材料制备与性能研究

Research on preparation and performance of RGO-S electrode materials for aluminum secondary batteries

以氧化石墨烯与硫代硫酸钠为原料,通过一步水热法,制备还原氧化石墨烯-硫(RGO-S)电极,通过XRD、XPS、SEM、TEM、恒流充放电测试等手段对电极进行分析。结果如下:在RGO-S中硫元素主要为单质,单质硫与还原氧化石墨烯之间主要是以物理吸附的方式结合,主要以S2p3形态存在,小部分以S2p1形态存在。硫元素含量越高,初次充放电容量越高,循环性能越差。硫碳质量比为3:7的RGO-S复合材料具有最优性能,经过120次的充放电循环后放电容量回复到92%左右,在高倍率电流密度下放电容量保持在58.83mAh/g。

The RGO-S electrode is prepared at high temperature by the one-step hydrothermal method using the oxidized graphene and the sodium thiosul fate as raw material.The performance of RGO-S electrode was studied by XRD,XPS,SEM,TEM and galvanostatic charge-discharge tests.The results showed that in the RGO-S composites,the Sulfur element exists in simple substance,and the elemental Sulfur exists in the form of S2p1 and S2p3,combined with RGO in the physical way.The higher the sulfur content,the higher the initial charge and discharge capacity,the worse the cycle performance.The RGO-S composite with sulfur-carbon ratio of 3:7 has the best performance.After 120 charge-discharge cycles,the discharge capacity is about 92%,and the discharge capacity is 58.83 mAh/g at high current density.