Lithium–sulfur battery promises great potential to promote the reform of energy storage field. Modified functional interlayer on separator has been recognized as efficient method to promote battery performances, mainly focusing on the entrapment and catalytic effect toward lithium polysulfide, while the mass transfer property across the interlayers has not been carefully considered. Herein, a dense layer composed of ion-inserted metal–organic frameworks is used to facilitate mass transfer across the layer and ensure high polysulfides entrapment efficiency. In situ Raman study reveals that the dense functional layer blocks the transfer of Li ions, while the ion-inserted layer can accelerate the ion-transfer kinetics and avoid the ion depletion caused polarization. As a result, a specific capacity of 742 mAh g⁻¹ is obtained at 2 C, with the decay rate of 0.089% per cycle at 1 C over 600 cycles, demonstrating great potential for the application in advanced Li–S batteries.

中文翻译：

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离子插入金属-有机骨架加速锂-硫电池中的传质动力学

锂硫电池有望推动储能领域的改革。隔膜上的改性功能中间层已被认为是提高电池性能的有效方法，主要集中在对多硫化锂的捕获和催化作用，而没有仔细考虑跨中间层的传质性能。在此，由离子插入的金属-有机骨架组成的致密层用于促进跨层的传质并确保高多硫化物截留效率。原位拉曼研究表明，致密的功能层阻止了锂离子的转移，而离子插入层可以加速离子转移动力学，避免离子耗尽引起的极化。结果，比容量为 742 mAh g ^-1 在 2 C 下获得，在 1 C 超过 600 次循环时每个循环的衰减率为 0.089%，显示出在先进 Li-S 电池中的巨大应用潜力。