Lithium-sulfur (Li-S) battery is a promising high-energy density device. However, the shuttling of lithium polysulfide (LiPS) and severe volume variation of sulfur has hindered its practical application. Herein, a nitrogen-doped micro-mesoporous Co/NC-TiO₂ composite derived from cobalt-doped MIL-125 is prepared as efficient multifunctional sulfur host. In the design of this composite, abundant micro-mesoporous structure is introduced by cobalt ion etching and ammonia treatment, which affords sufficient space for sulfur loading and adapts to large volume variation. Meanwhile, the polar TiO₂ endows the composite with high sulfur affinity, and the introduction of cobalt offers strong LiPS adsorption and fast redox reaction kinetics. Accordingly, the Co/NC-TiO₂ electrode achieves a specific capacity of 941 mAh g⁻¹ at 1 C and a low capacity decay rate of 0.062% per cycle after 500 cycles. It is also capable of delivering a high capacity of 730 mAh g⁻¹ at 3 C. At sulfur loading of 5.5 mg cm⁻², the Co/NC-TiO₂ electrode provides a high areal initial capacity of 5.6 mAh cm⁻², showing promising application in Li-S batteries.

锂硫（Li-S）电池是一种很有前途的高能量密度装置。然而，多硫化锂（LiPS）的穿梭和硫的剧烈体积变化阻碍了其实际应用。在此，制备了一种源自钴掺杂 MIL-125的氮掺杂微介孔 Co/NC-TiO _{2复合材料作为高效的多功能硫主体。}在该复合材料的设计中，通过钴离子蚀刻和氨处理引入了丰富的微介孔结构，为硫负载提供了足够的空间并适应大体积变化。同时，极性 TiO ₂赋予复合材料高硫亲和力，钴的引入提供强 LiPS 吸附和快速氧化还原反应动力学。据此，Co/NC-TiO ₂电极在 1 C 时实现了 941 mAh g ^-1的比容量，并且在 500 次循环后每次循环的容量衰减率为 0.062%。它还能够在 3 C下提供 730 mAh g ^{−1的高容量。在 5.5 mg cm −2}的硫负载下，Co/NC-TiO ₂电极提供 5.6 mAh cm ⁻²的高面积初始容量，在 Li-S 电池中显示出有前景的应用。