柔性MOF衍生硫化亚锡/碳纤维的制备及储钠性能

Preparation and sodium storage performance of flexible MOF-derived stannous sulfide/carbon nanofibers

将Sn-MOF分散在N,N-二甲基甲酰胺中,并加入聚丙烯腈(PAN)静电纺丝得到Sn-MOF/PAN纳米纤维,经过高温煅烧后得到了硫化亚锡/碳纤维(SnS/CNFs)。SnS/CNFs-2电极材料具有良好的柔性,在弯折状态下依然保持着良好的柔性。通过扫描电镜、X射线衍射仪和EDS元素分析等表征方法,测定了SnS/CNFs-2的形貌、晶体结构。将该柔性电极材料作为钠离子电池负极材料时,表现出优异的倍率性能和循环稳定性。结果表明:对于SnS/CNFs-2电极材料,其具有良好的倍率性能,在1A/g、2A/g、5A/g、10A/g的电流密度下对应的放电比容量分别为271mAh/g、236mAh/g、157mAh/g、64mAh/g。另外,SnS/CNFs-2复合纳米材料在高达1A/g的大电流密度下表现出良好的循环稳定性,循环100圈后,放电容量高达260mAh/g。

Sn-MOF powders were dispersed in N,N-dimethylformamide,and then added with polyacrylonitrile(PAN)electrospinning to obtain Sn-MOF/PAN nanofibers.The nanofibers were calcined at high temperature to prepare stannous sulfide/carbon nanofibers(SnS/CNFs).The SnS/CNFs-2 electrode had good flexibility and it could still maintain good flexibility in the bending state.The morphology and crystal structure of SnS/CNFs-2 were determined by SEM,XRD and EDS.When the flexible material was used as the anode material of sodium-ion battery,it exhibited excellent rate performance and cyclic stability.The results showed that for SnS/CNFs-2 composite,the corresponding specific discharge capacities under the current density of 1A/g,2A/g,5A/g,and 10A/g were 270mAh/g,236mAh/g,157mAh/g,64mAh/g,respectively.In addition,the SnS/CNFs-2 nanofibers showed good cyclic stability at a high current density of 1A/g,with a discharge capacity of up to 260 mAh/g after 100 cycles.