Nanoelectrochemistry Laboratory, Department of Chemical Engineering, National Taiwan University of Science and Technology , Taipei 106, Taiwan.
ACS Appl Mater Interfaces. 2017 Sep 6;9(35):29804-29811. doi: 10.1021/acsami.7b08804. Epub 2017 Aug 24.
The lithium-sulfur battery is considered as a prospective candidate for a high-energy-storage system because of its high theoretical specific capacity and energy. However, the dissolution and shutter of polysulfides lead to low active material utilization and fast capacity fading. Electrospinning technology is employed to directly coat an interlayer composed of polyacrylonitrile (PAN) and nitrogen-doped carbon black (NC) fibers on the cathode. Benefiting from electrospinning technology, the PAN-NC fibers possess good electrolyte infiltration for fast lithium-ion transport and great flexibility for adhering on the cathode. The NC particles provide good affinity for polysufides and great conductivity. Thus, the polysulfides can be trapped on the cathode and reutilized well. As a result, the PAN-NC-coated sulfur cathode (PAN-NC@cathode) exhibits the initial discharge capacity of 1279 mAh g and maintains the reversible capacity of 1030 mAh g with capacity fading of 0.05% per cycle at 200 mA g after 100 cycles. Adopting electrospinning to directly form fibers on the cathode shows a promising application.
锂硫电池因其具有高的理论比容量和能量而被认为是高能量存储系统的候选者。然而，多硫化物的溶解和穿梭导致活性材料的利用率低，容量快速衰减。静电纺丝技术被用于直接在阴极上涂覆由聚丙烯腈（PAN）和氮掺杂碳黑（NC）纤维组成的中间层。受益于静电纺丝技术，PAN-NC 纤维具有良好的电解质浸润性，有利于锂离子快速传输，并且具有很好的柔韧性，可以附着在阴极上。NC 颗粒对多硫化物具有良好的亲和力和高导电性。因此，多硫化物可以被捕获在阴极上并得到很好的再利用。结果，PAN-NC 涂层硫阴极（PAN-NC@cathode）在 200 mA g 下循环 100 次后，初始放电容量为 1279 mAh g，每循环容量衰减 0.05%，可逆容量为 1030 mAh g。采用静电纺丝技术直接在阴极上形成纤维显示出有前途的应用。
