Two reported three-dimensional covalent organic frameworks (3D-COFs), COF-300 and COF-301, which have hierarchical porous structures and large pore volumes, were synthesized and employed as host materials for lithium-sulfur batteries. Owing to possessing excellent porosities as well as abundant hydroxyl groups in the pore walls, COF-301 can not only trap lithium polysulfides (PSs) via physical adsorption inside the pores, but also capture PSs by chemical interactions to relieve the shuttle effect. Interestingly, it is the first time that 3D-COFs were utilized as host materials for lithium-sulfur batteries as well as hydroxyl groups were introduced into COFs for improving the battery performance. As a result, COF-301@S as cathode material could reserve the capacity of 411.6 mA·h·g⁻¹ after 500 cycles with only 0.081% fading per cycle at 0.5 C, exhibiting better battery performance compared with COF-300@S. This study not only expands the applications of 3D-COFs but also provides a new route for designing lithium-sulfur batteries.

合成了两个报道的三维共价有机骨架（3D-COF）COF-300和COF-301，它们具有分层的多孔结构和大的孔体积，并被用作锂硫电池的主体材料。由于具有优异的孔隙率和孔壁中丰​​富的羟基，COF-301不仅可以通过物理吸附在孔内捕获多硫化锂（PSs），而且可以通过化学相互作用捕获PSs以减轻穿梭效应。有趣的是，这是第一次将3D-COFs用作锂硫电池的主体材料，并且在COFs中引入了羟基以改善电池性能。结果，作为阴极材料的COF-301 @ S可保留411.6 mA·h·g ^-1的容量。在500次循环后，在0.5 C下每个循环仅衰减0.081％，与COF-300 @ S相比，电池性能更好。这项研究不仅扩展了3D-COF的应用范围，而且为设计锂硫电池提供了一条新途径。