The commercialization of lithium–sulfur batteries (LSBs) remains difficult owing to the shuttle effect of soluble lithium–polysulfide and the poor redox kinetics of a traditional cell configuration without a sophisticated cathode design. To resolve these difficulties, we developed modified separators with electrically exploded MoO₂@carbon nanotube (MoO₂@CNT) nanocomposites. The embedded MoO₂ nanoparticles demonstrated strong chemical anchoring properties with polysulfides; meanwhile, a porous CNT scaffold supported suppression of the shuttle effect and acted as an upper current collector. In addition, the mesoporous textural properties of a MoO₂@CNT nanocomposite provide a suitable lithium-ion pathway with enhanced ionic conductivity and additional active sites for active sulfur during cycling; finally, a high utilization of sulfur is achieved in a reversible manner. The LSBs using the modified separator with the optimized MoO₂@CNT nanocomposite exhibit high discharge capacities of 1067 mA h g^–1 at 0.2 C after 100 cycles and significant cycling stability at 1 C. Also, an impressive anti-self-discharge feature and improved rate capabilities were achieved through the introduction of a MoO₂@CNT nanocomposite. We believe that our approach can be used as a proof-of-concept for further research into effective methods to prepare modified separators with various electrically exploded carbon–metal oxide nanocomposites that can used in high-performance LSBs.

中文翻译：

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使用MoO ₂ @碳纳米管纳米复合材料修饰的隔膜作为高性能防自放电锂硫电池双模Li-聚硫化物固定材料

锂硫电池（LSBs）的商业化仍然很困难，这归因于可溶性多硫化锂的穿梭效应以及传统电池配置（没有复杂的阴极设计）的氧化还原动力学差。为了解决这些困难，我们开发了带有电爆炸MoO ₂ @碳纳米管（MoO ₂ @CNT）纳米复合材料的改性隔板。包埋的MoO ₂纳米颗粒表现出与多硫化物的强化学锚定特性。同时，多孔CNT支架抑制了穿梭效应，并用作上部集电器。另外，MoO ₂的介孔结构性质@CNT纳米复合材料提供了合适的锂离子途径，该途径具有增强的离子电导率和循环过程中活性硫的其他活性位点；最后，以可逆的方式实现了硫的高利用率。使用具有优化的MoO ₂ @CNT纳米复合材料的改良隔膜的LSB在100个循环后在0.2 C下表现出1067 mA hg ^–1的高放电容量，在1 C下具有明显的循环稳定性。此外，令人印象深刻的抗自放电功能和改进通过引入MoO ₂实现了速率能力@CNT纳米复合材料。我们相信，我们的方法可以用作进一步研究有效方法的概念验证，以制备可用于高性能LSB的具有各种电爆炸碳-金属氧化物纳米复合材料的改性隔板。