Lithium-sulfur (Li-S) batteries have been viewed as promising candidates for next-generation high-energy rechargeable batteries due to their high theoretical energy density. However, their practical application is severely impeded by the notorious shuttle effect of soluble polysulfides. Herein, a nature polymer of konjac glucomannan (KGM) was adopted as polysulfide-adsorbing agent by coating on carbon nanofiber (CNF) mats for polysulfide-trapping interlayers in Li-S batteries. A uniform coating method was developed by improving the wettability of CNFs to aqueous solutions using ethanol as a co-solvent of water. It is revealed that not only the KGM polymer itself but also the coating quality is critical to prevent polysulfide diffusion. With the improved coating quality and the strong chemisorption of KGM, the shuttle effect was effectively suppressed and excellent electrochemical performance was demonstrated with a high reversible capacity of 1286 mAh g⁻¹ at 0.2C, good cycling stability with a capacity retention of 84% after 400 cycles at 1C and high rate capability. Our findings provide a facile way to address the shuttle behavior of Li-S batteries using low-cost and environmental friendly materials, which are very promising for large-scale energy storage applications.

锂硫（Li-S）电池由于其较高的理论能量密度而被视为下一代高能可充电电池的有希望的候选者。但是，它们的实际应用受到可溶性多硫化物臭名昭著的穿梭效应的严重阻碍。在此，通过将魔芋葡甘露聚糖（KGM）的天然聚合物涂覆在用于Li-S电池中的多硫化物捕获夹层的碳纳米纤维（CNF）垫上，作为多硫化物吸附剂。通过使用乙醇作为水的共溶剂来改善CNF对水溶液的润湿性，开发了一种均匀的涂覆方法。据揭示，不仅KGM聚合物本身，而且涂层质量对于防止多硫化物扩散都是至关重要的。随着涂层质量的改善和KGM的强化学吸附，在0.2C时为^-1，具有良好的循环稳定性，在1C下进行400次循环后容量保持率为84％，并且具有较高的倍率能力。我们的发现为使用低成本且环保的材料解决Li-S电池的穿梭行为提供了一种简便的方法，这对于大规模储能应用非常有前途。