通过静电纺丝制备出碳纤维，然后高温退火处理获得氮掺杂多孔碳纤维，并将其作为硫的宿主材料，最终得到N-CNFs/S正极材料。利用XRD、TG、TEM等对N-CNFs/S复合电极材料的结构和形貌进行表征。N-CNFs/S作为正极材料组装的锂硫电池的电化学性能测试结果表明，在167 mA/g和836 mA/g的电流密度下，N-CNFs/S复合电极材料循环250圈和500圈后容量分别高达836 mA·h/g和631 mA·h/g；同时，N-CNFs/S复合电极材料还表现出良好的倍率性能。

Carbon fibers are prepared through electrospinning,and then treated by high-temperature annealing to obtain nitrogen-doped porous carbon fibers,which are used as sulfur host materials,and finally N-CNFs/S cathode materials are obtained.The target product is characterized,and the structure and morphology of N-CNFs/S composite electrode material are studied.Lithium sulfur battery assembled with N-CNFs/S as cathode material exhibits good electrochemical performance.At current densities of 167 mA·g^-1 and 836 mA·g^-1,the capacity of N-CNFs/S composite electrode material can be as high as 836 mAh·g^-1 and 631 mAh·g^-1 after 250 cycles and 500 cycles,respectively.Meanwhile,N-CNFs/S composite electrode material also shows good rate performance.

杨玉艳(1983-),女,工程硕士,讲师,主要从事新能源及应用研究,thry2020@163.com