Jiang Wen, Dong Lingling, Liu Shuanghui, Zhao Shuangshuang, Han Kairu, Zhang Weimin, Pan Kefeng, Zhang Lipeng
School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, China.
School of Materials and New Energy, South China Normal University, Shanwei 516600, China.
Nanomaterials (Basel). 2022 Apr 14;12(8):1347. doi: 10.3390/nano12081347.
Lithium-sulfur batteries exhibit great potential as one of the most promising energy storage devices due to their high theoretical energy density and specific capacity. However, the shuttle effect of the soluble polysulfide intermediates could lead to a severe self-discharge effect that hinders the development of lithium-sulfur batteries. In this paper, a battery separator has been prepared based on NiFeO/Ketjen Black (KB) modification by a simple method to solve the shuttle effect and improve the battery performance. The as-modified separator with the combination of small-size KB and NiFeO nanoparticles can effectively use the physical and chemical double-layer adsorption to prevent polysulfide from the shuttle. Moreover, it can give full play to its catalytic effect to improve the conversion efficiency of polysulfide and activate the dead sulfur. The results show that the NiFeO/KB-modified separator battery still maintains a discharge capacity of 406.27 mAh/g after 1000 stable cycles at a high current density of 1 C. Furthermore, the coulombic efficiency remains at 99%, and the average capacity attenuation per cycle is only 0.051%. This simple and effective method can significantly improve the application capacity of lithium-sulfur batteries.
锂硫电池因其高理论能量密度和比容量，作为最具潜力的储能装置之一展现出巨大潜力。然而，可溶性多硫化物中间体的穿梭效应会导致严重的自放电现象，阻碍了锂硫电池的发展。本文通过一种简单的方法制备了基于NiFeO/科琴黑（KB）改性的电池隔膜，以解决穿梭效应并提高电池性能。具有小尺寸KB和NiFeO纳米颗粒组合的改性隔膜能够有效利用物理和化学双层吸附作用来防止多硫化物穿梭。此外，它可以充分发挥其催化作用，提高多硫化物的转化效率并激活死硫。结果表明，在1 C的高电流密度下经过1000次稳定循环后，NiFeO/KB改性隔膜电池仍保持406.27 mAh/g的放电容量。此外库仑效率保持在99%，每循环的平均容量衰减仅为0.051%。这种简单有效的方法能够显著提高锂硫电池的应用性能。
