Lithium-sulfur (Li-S) batteries are regarded as new energy storage systems due to their low cost and high specific energy density; however, their commercial prospects are hindered by the shuttle effect of lithium polysulfides (LiPSs). Herein, the fabricating necklace-like carbon nanofibers membrane co-decorated by TiO and SiO (TiO@SiO/CNF) is prepared by the electrospinning technique as an interlayer to catalyze the conversion of LiPSs in Li-S batteries. The necklace-like nanofibers provide a three-dimensional conductive network, enabling SiO synergy with TiO to accelerate the redox kinetics of LiPSs through an enhanced interfacial effect. The Li-S batteries based on TiO@SiO/CNF interlayers exhibit an impressive specific capacity of 658 mAh g at 3.0C, and their performances are decayed only 0.05 % per cycle at 1.0C within 500cycles. Our study reveals that the shuttle effect addition of LiPSs can be significantly improved by rational structural design, thus enhancing the electrochemical performance of Li-S batteries. The synthesis of necklace-like TiO@SiO/CNF presents a promising strategy for designing functional interlayers for advanced Li-S batteries.

中文翻译：

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由 TiO2 和 SiO2 共同装饰的项链状碳纳米纤维柔性电催化膜实现的先进锂硫电池

锂硫（Li-S）电池因其成本低、比能量密度高而被视为新型储能系统；然而，它们的商业前景受到多硫化锂（LiPS）的穿梭效应的阻碍。本文通过静电纺丝技术制备了由 TiO 和 SiO 共修饰的项链状碳纳米纤维膜（TiO@SiO/CNF）作为中间层，以催化 Li-S 电池中 LiPS 的转化。项链状纳米纤维提供了三维导电网络，使 SiO2 与 TiO2 协同作用，通过增强的界面效应加速 LiPS 的氧化还原动力学。基于TiO@SiO/CNF中间层的Li-S电池在3.0C下表现出令人印象深刻的比容量658 mAh g，并且在1.0C下500次循环内其性能仅衰减0.05%。我们的研究表明，通过合理的结构设计可以显着改善LiPSs的穿梭效应，从而提高Li-S电池的电化学性能。项链状 TiO@SiO/CNF 的合成为设计先进锂硫电池的功能性中间层提供了一种有前景的策略。