The severe shuttle effect and slow kinetics of lithium polysulfide (LiPS) conversion are two major obstacles to the practical application of lithium sulfur batteries. Ultra-thin 2D MoO₂ nanosheets (MoO₂ NSs) have been synthesized by chemical vapor deposition and then mixed with carbon nanotubes (CNTs) using as coating materials of the Celgard 2400 polypropylene separator to solve these problems. The 2D character of MoO₂ NSs produced high surface/volume ratios and abundant active binding sites for anchoring LiPSs. In addition, the partial reduction of MoO₂ NSs in a H₂/Ar mixture introduced oxygen vacancies in their surface, which acted as catalytic sites for LiPS conversion, while the CNT network ensured rapid electron transfer for LiPS conversion reactions. Symmetric dummy cell tests showed that a 30wt%MoO₂/CNT coated separator reduced the energy barrier for Li₂S nucleation, and first-principles calculations verified its strong binding energy to entrap LiPSs and increase Li₂S precipitation. Because of these features, a cell with a 30wt%MoO₂/CNT coated separator had an improved specific capacity of 738 mAh·g⁻¹ at 1 C with a slow decay rate of 0.053% for 800 cycles.

多硫化锂（LiPS）转化的严重穿梭效应和缓慢的动力学是锂硫电池实际应用的两大障碍。超薄二维 MoO ₂纳米片 (MoO ₂ NSs) 通过化学气相沉积合成，然后与碳纳米管 (CNT) 混合，用作 Celgard 2400 聚丙烯隔膜的涂层材料，以解决这些问题。MoO ₂ NSs的二维特性产生了高表面/体积比和丰富的用于锚定 LiPS 的活性结合位点。此外，MoO ₂ NSs 在 H ₂/Ar 混合物在其表面引入了氧空位，作为 LiPS 转化的催化位点，而 CNT 网络确保了 LiPS 转化反应的快速电子转移。对称假电池测试表明，30wt% MoO ₂ /CNT 涂层的隔膜降低了 Li ₂ S 成核的能垒，第一性原理计算证实了其强大的结合能可以捕获 LiPSs 并增加 Li ₂ S 沉淀。由于这些特性，具有 30wt% MoO ₂ /CNT 涂层隔膜的电池在 1 C 下具有738 mAh·g ^-1的改进比容量，并且在 800 次循环中衰减率为 0.053%。