Kalybekkyzy Sandugash, Mentbayeva Almagul, Yerkinbekova Yerkezhan, Baikalov Nurzhan, Kahraman Memet Vezir, Bakenov Zhumabay
National Laboratory Astana, Nazarbayev University, Institute of Batteries, Nur-Sultan 010000, Kazakhstan.
School of Engineering and Digital Sciences, Nazarbayev University, Nur-Sultan 010000, Kazakhstan.
Nanomaterials (Basel). 2020 Apr 14;10(4):745. doi: 10.3390/nano10040745.
Light weight carbon nanofibers (CNF) fabricated by a simple electrospinning method and used as a 3D structured current collector for a sulfur cathode. Along with a light weight, this 3D current collector allowed us to accommodate a higher amount of sulfur composite, which led to a remarkable increase of the electrode capacity from 200 to 500 mAh per 1 g of the electrode including the mass of the current collector. Varying the electrospinning solution concentration enabled obtaining carbonized nanofibers of uniform structure and controllable diameter from several hundred nanometers to several micrometers. The electrochemical performance of the cathode deposited on carbonized PAN nanofibers at 800 °C was investigated. An initial specific capacity of 1620 mAh g was achieved with a carbonized PAN nanofiber (cPAN) current collector. It exhibited stable cycling over 100 cycles maintaining a reversible capacity of 1104 mAh g at the 100th cycle, while the same composite on the Al foil delivered only 872 mAh g. At the same time, 3D structured CNFs with a highly developed surface have a very low areal density of 0.85 mg cm (thickness of ~25 µm), which is lower for almost ten times than the commercial Al current collector with the same thickness (7.33 mg cm).
通过简单的静电纺丝方法制备的轻质碳纳米纤维（CNF），用作硫阴极的三维结构化集流体。这种三维集流体除了重量轻之外，还使我们能够容纳更多的硫复合材料，这导致电极容量从每1克包括集流体质量的电极200 mAh显著增加到500 mAh。改变静电纺丝溶液浓度能够获得结构均匀、直径可控制在几百纳米到几微米的碳化纳米纤维。研究了在800℃碳化的PAN纳米纤维上沉积的阴极的电化学性能。使用碳化PAN纳米纤维（cPAN）集流体时，初始比容量达到1620 mAh/g。它在100次循环中表现出稳定的循环性能，在第100次循环时保持1104 mAh/g的可逆容量，而在铝箔上的相同复合材料仅提供872 mAh/g。同时，具有高度发达表面的三维结构化CNF具有非常低的面密度，为0.85 mg/cm²（厚度约为25 µm），几乎比相同厚度的商业铝集流体（7.33 mg/cm²）低十倍。
