Developing functional porous carbon materials that are efficient for hosting S and catalytically converting Li polysulfide (LiPS) is of great importance to ease the LiPS shuttle effect, which is the main obstacle against the practical applications of Li−S batteries. Herein, we developed a porous binary FeCo-NC material functionalized by dual-site catalytic FeCo species and delicately introduced carbon nanotube (CNT) forest on FeCo-NC surface. The successful decoration of highly dispersed binary Fe and Co species and heavily introduced N species up to 10 at.%, are critical to improve the quality of host interfaces for high-efficiency anchoring/conversion of polar LiPS and electrolyte wetting. The fluffy CNT forest on particulate FeCo-NC can serve as highway for electron conducting and reservoir for confining S/LiPS when physically stacked. Electrochemical measurements indicated binary FeCo-NC/CNT composite serving as host for a 70 wt.% S loading. It showed enhanced absorption and conversion kinetics of LiPS, and improved rate capability and stability of Li−S half-cell.

中文翻译：

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在二元 FeCo-NC 上合理构建蓬松碳纳米管作为锂硫电池的高效 S 主体

开发可有效承载 S 和催化转化多硫化锂 (LiPS) 的功能性多孔碳材料对于缓解 LiPS 穿梭效应非常重要，这是阻碍 Li-S 电池实际应用的主要障碍。在此，我们开发了一种多孔二元 FeCo-NC 材料，通过双位点催化 FeCo 物种功能化，并在 FeCo-NC 表面上巧妙地引入碳纳米管 (CNT) 林。高度分散的二元 Fe 和 Co 物种的成功装饰以及高达 10 at.% 的大量引入的 N 物种对于提高主体界面的质量至关重要，以实现极性 LiPS 的高效锚定/转化和电解质润湿。颗粒状 F​​eCo-NC 上蓬松的 CNT 森林可以作为电子传导的高速公路和物理堆叠时限制 S/LiPS 的储库。电化学测量表明二元 FeCo-NC/CNT 复合材料作为 70 wt.% S 负载的主体。它显示出增强的 LiPS 吸收和转化动力学，并提高了 Li-S 半电池的倍率性能和稳定性。