Rechargeable lithium-sulfur batteries have been regarded as the promising next generation energy storage system due to their overwhelming advantages in energy density. However, their practical implementations are hindered by severe capacity fading and low sulfur utilization, which are caused by polysulfide shuttling and the insulating nature of sulfur. Herein, sulfur-embedded porous multichannel carbon nanofibers coated with MnO₂ nanosheets (CNFs@S/MnO₂) are rationally designed and fabricated as cathode for lithium-sulfur battery. The high conductivity of porous multichannel carbon nanofibers facilitates the kinetics of electron and ion transport in the electrodes, and the porous structure encapsulates and sequesters sulfur in its interior void space to physically retard the dissolution of high-order polysulfides. Moreover, the MnO₂ shell exhibits a combination of physical and chemical adsorption for high-order polysulfides, which could sequester polysulfides leaked from the carbon matrix after long-time charge/discharge cycles, resulting in enhanced cyclic stability. As a result, the electrode delivers a specific capacity of 1286 mA h g⁻¹ at 0.1 C and 728 mA h g⁻¹ at 3 C. And the capacity could remain 774 mA h g⁻¹ after 600 cycles at 1 C.

可充电锂硫电池由于其在能量密度方面的压倒性优势而被视为有前途的下一代能量存储系统。然而，由于多硫化物的穿梭和硫的绝缘性所导致的严重的容量衰减和低硫利用率，阻碍了它们的实际实施。此处，用MnO ₂纳米片（CNFs @ S / MnO _2）涂覆的硫包埋的多孔多通道碳纳米纤维）被合理设计和制造为锂硫电池的正极。多孔多通道碳纳米纤维的高电导率促进了电极中电子和离子传输的动力学，并且多孔结构将硫包裹并隔离在其内部空隙空间中，从而物理上阻碍了高阶多硫化物的溶解。此外，MnO ₂壳层对高阶多硫化物表现出物理和化学吸附的结合，在长时间的充电/放电循环后，它可以隔离从碳基质泄漏的多硫化物，从而提高了循环稳定性。其结果是，该电极提供1286毫安Hg的比容量^-1以0.1C和728毫安汞柱^-1在3 C下。在1 C下进行600次循环后，容量可以保持774 mA hg ^-1。