Owing to the low cost, high energy density, and high theoretical specific capacity, lithium-sulfur batteries have been deemed as a potential choice for future energy storage devices. However, they also have suffered from several scientific and technical issues including low conductivity, polysulfides migration, and volume changes. In this study, CoS₂-TiO₂@carbon core–shell fibers were fabricated through combination of coaxial electrospinning and selective vulcanization method. The core–shell fibers are able to efficiently host sulfur, confine polysulfides, and accelerate intermediates conversion. This electrode delivers an initial specific capacity of 1181.1 mAh g⁻¹ and a high capacity of 736.5 mAh g⁻¹ after 300 cycles with high coulombic efficiency over 99.5% (capacity decay of 0.06% per cycle). This strategy of isolating interactant and selective vulcanization provides new ideas for effectively constructing heterostructure materials for lithium-sulfur batteries.

由于成本低、能量密度高、理论比容量高，锂硫电池被认为是未来储能设备的潜在选择。然而，它们也存在一些科学和技术问题，包括低电导率、多硫化物迁移和体积变化。在这项研究中，CoS ₂ -TiO ₂ @碳核壳纤维是通过同轴静电纺丝和选择性硫化法相结合制备的。核壳纤维能够有效地承载硫、限制多硫化物并加速中间体转化。该电极提供 1181.1 mAh g ^-1的初始比容量和 736.5 mAh g ^-1的高容量300 次循环后，库仑效率高达 99.5% 以上（每次循环容量衰减 0.06%）。这种隔离相互作用和选择性硫化的策略为有效构建锂硫电池异质结构材料提供了新思路。