Polysulfide shuttle and lithium dendrite growth severely limit the practical application of lithium−sulfur batteries (LSBs); however, a rational design of a separator can achieve the effect of two birds with one stone. Herein, nitrogen-doped carbon nanotubes with dispersed TiN/CoO particles (TCCNT) were designed and applied as a separator modification layer for LSBs. The porous structure of TCCNT can confine the diffusion of soluble polysulfides by physical adsorption first, and then the TiN/CoO particles carried on its surface/inside can not only further anchor the polysulfides via chemisorption but also act as a catalyst to facilitate their conversion. Meanwhile, the good lithophilicity of TiN was beneficial to homogenizing the Li⁺ fluxes, guiding a uniform deposition of lithium and realizing a stable cycle of the lithium symmetric battery for up to 2000 h at 5 mA cm⁻². Ascribed to the rational layout of the TCCNT layer that allows maximization of the synergistic effect between various material components, an LSB equipped with a modified separator displayed satisfactory electrochemical performance in both cases of conventional and high sulfur loadings, demonstrating its practical application potential.

多硫化物穿梭和锂枝晶生长严重限制了锂硫电池（LSB）的实际应用；但合理设计分离器，可以达到一石二鸟的效果。本文设计了分散有 TiN/CoO 颗粒的氮掺杂碳纳米管 (TCCNT)，并将其用作 LSB 的隔膜改性层。TCCNT的多孔结构首先可以通过物理吸附限制可溶性多硫化物的扩散，然后其表面/内部携带的TiN/CoO颗粒不仅可以通过化学吸附进一步锚定多硫化物，还可以充当催化剂以促进其转化。同时，TiN良好的亲石性有利于均匀化Li ^{+通量，引导锂的均匀沉积，并实现锂对称电池在5 mA cm -2}下稳定循环长达2000 h 。由于TCCNT层的合理布局可以最大限度地发挥各种材料成分之间的协同效应，配备改良隔膜的LSB在传统和高硫负载量的情况下都表现出令人满意的电化学性能，展示了其实际应用潜力。