A 3D assembly of nitrogen-doped carbon nanofibers (NCFs) derived from polyacrylonitrile was synthesized by a combined electrospinning/carbonization technique and was used as the positive current collector in lithium sulfur (Li-S) batteries containing a Li₂S₆ catholyte solution. The physical and electrochemical behavior of the NCFs were investigated and it was found that their electrochemical performances depended on the pyrolysis temperature. Of the samples carbonized at 800, 900 and 1000 °C, those carbonized at 900 °C performed best, and delivered a reversible capacity of 875 mAh•g⁻¹ at a high sulfur loading of 4.19 mg•cm² and retained at 707 mAh•g⁻¹ after 250 cycles at 0.2 C. The coulombic efficiency of the NCF-900@Li₂S₆ electrode was almost 98.55% over the entire cycle life. In addition, the capacity retention of the electrode reached 81.53% even at a high current density of 1 C for over 150 cycles. It was found that the NCFs carbonized at 900 °C had the highest electrical conductivity, which might be the dominant factor that determined its performance for use as a positive current collector.

通过结合静电纺丝/碳化技术合成了源自聚丙烯腈的氮掺杂碳纳米纤维 (NCF) 的 3D 组件，并用作包含 Li ₂ S ₆阴极电解液的锂硫 (Li-S) 电池中的正极集电器。研究了 NCFs 的物理和电化学行为，发现它们的电化学性能取决于热解温度。在 800、900 和 1000 °C 碳化的样品中，在 900 °C 碳化的样品表现最好，在 4.19 mg•cm ^{2 的}高硫负载下提供 875 mAh•g ^-1的可逆容量并保持在 707 mAh •g ^-1在 0.2 C 下循环 250 次后。NCF-900@Li ₂ S ₆电极在整个循环寿命内的库仑效率几乎为 98.55%。此外，即使在 1 C 的高电流密度下循环超过 150 次，电极的容量保持率也达到了 81.53%。发现在 900°C 碳化的 NCF 具有最高的电导率，这可能是决定其用作正极集电器性能的主要因素。