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通过熔融扩散法合成了一系列不同含硫量的有序介孔碳(CMK-3)/硫复合材料(C x Sy).使用X射线衍射(XRD)、拉曼光谱(Raman)、比表面积测定仪(BET)、扫描电镜(SEM)、透射电镜(TEM)分析、表征和观察样品.将复合材料组装成钠硫电池,室温下测试电化学性能.循环伏安(CV)曲线结果表明,室温钠硫电池在1.61 V处有一个还原峰,对应于Na2Sx(x=2~5)的形成;在1.82 V和1.95 V分别有一个氧化峰,对应于Na2Sx(x=2~5)的分解.50%(by mass,下同)硫含量(C1S1)电极0.05C(1C=558 mA·g-1)倍率首周放电容量500 mAh·g-1,50周期循环比容量为305.6 mAh·g-1.交流阻抗数据拟合计算其表观活化能为21.83 kJ·mol-1.本研究可为室温钠硫电池多孔电极材料的研究提供一定的指导作用.
A series of ordered mesoporous carbons (CMK-3) / sulfur composites (C x Sy) with different sulfur contents were synthesized by melt diffusion method. XRD, Raman, (BET), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize and observe the samples.The composites were assembled into sodium-sulfur batteries and the electrochemical properties were tested at room temperature.The results of cyclic voltammetry (CV) At room temperature, the sodium-sulfur cell has a reduction peak at 1.61 V corresponding to the formation of Na2Sx (x = 2 to 5). There is an oxidation peak at 1.82 V and 1.95 V, corresponding to the decomposition of Na2Sx (x = 2 to 5) .50% (by mass) Sulfur content (C1S1) Electrode 0.05C (1C = 558 mA · g-1) Magnification First-cycle discharge capacity 500 mAh · g-1, 50 cycles Cycle specific capacity 305.6 mAh · g -1. The apparent activation energy calculated by the AC impedance data is 21.83 kJ · mol-1. This study may provide some guidance for the study of porous electrode materials for sodium-sulfur batteries at room temperature.