The “shuttle effect” and sluggish conversion reaction kinetics of polysulfides seriously hinder the practical application of Li‐S batteries. In this study, nano‐sized LaMnO3 (N‐LMO) with typical perovskite structure combined with highly‐conductive carbon black (SP) was introduced on the commercial separator to fabricate a functional surface modification. It is found that the polar N‐LMO with abundant active sites offers strong chemisorption towards the soluble polysulfides meanwhile accelerates their redox conversion, and the conductive SP contributes to extra spots to reactivate the trapped sulfur species. Consequently, the synergistic effect of adsorption‐catalysis‐conduction built by the cooperative N‐LMO/SP modification greatly enhances the sulfur redox kinetics as well as suppresses the polysulfide shuttling not at the expense of weakening Li‐ion transport, which endows the Li‐S cell with a high initial discharge capacity of 1143.6 mAh g−1 at 0.2 C and a capacity decay rate of only 0.072% per cycle at 1 C over 500 cycles.

中文翻译：

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纳米LaMnO3改性隔膜可增强锂硫电池的氧化还原反应动力学和电化学性能

多硫化物的“穿梭效应”和缓慢的转化反应动力学严重阻碍了锂硫电池的实际应用。在这项研究中，将具有典型钙钛矿结构的纳米LaMnO3（N-LMO）与高导电炭黑（SP）结合在商用隔膜上，以制造功能性表面改性。研究发现，具有丰富活性位点的极性N-LMO对可溶性多硫化物具有很强的化学吸附作用，同时加速其氧化还原转化，而导电SP有助于形成额外的点来重新激活捕获的硫物质。因此，通过协同N-LMO/SP修饰建立的吸附催化传导协同效应极大地增强了硫氧化还原动力学，并抑制了多硫化物穿梭，而不是以削弱锂离子传输为代价，从而赋予了Li- S电池在0.2 C下具有1143.6 mAh g−1的高初始放电容量，并且在1 C下500次循环后容量衰减率仅为0.072%。