锂硫电池正极用氮掺杂的多孔碳纤维载体材料的研究

Nitrogen-doped porous carbon fiber support materials for cathode of lithium sulfur battery

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NCNFs/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 m A/g和836 m A/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 m A·h/g和631 m A·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 m A·g^(-1)and 836 m A·g^(-1),the capacity of N-CNFs/S composite electrode material can be as high as 836 m Ah·g^(-1)and 631 m Ah·g^(-1)after 250 cycles and 500 cycles,respectively.Meanwhile,N-CNFs/S composite electrode material also shows good rate performance.