The most critical obstacle preventing lithium–sulfur batteries (LSBs) from practical application is the shuttle effect. Herein, we present a zirconium based metal–organic framework (MOF) composite separator which effectively blocks polysulfides from shuttling without hampering the migration of lithium ions owing to the sieving effect of the MOFs. Moreover, owing to the high Brunauer–Emmett–Teller (BET) surface area of 1418 m² g⁻¹ and chemical interactions with zirconium and oxygen on the MOFs, the polysulfides can also be physically and chemically adsorbed on the surface of the MOFs, which further blocks the polysulfides from shuttling through the intergranular channels of the MOF particles. In addition, the wettability of the composite separator with the electrolyte is enhanced owing to the polar functional groups of –COOH and –OH on the MOFs. The battery with a composite separator delivers an initial discharge capacity of 1239 mA h g⁻¹ at 0.2C and 1147.4 mA h g⁻¹ at 0.5C. The reversible capacity is maintained at 964.1 mA h g⁻¹ with an average fading of only 0.08% per cycle at 0.5C. The capacity at the 2C rate with the composite separator is 955.8 mA h g⁻¹, which is far more than that of the pristine separator, which is 289.2 mA h g⁻¹.

中文翻译：

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从成分和结构的角度研究金属有机骨架防止多硫化物穿梭的机理

阻碍锂硫电池（LSB）实际应用的最关键障碍是穿梭效应。本文中，我们介绍了一种基于锆的金属-有机骨架（MOF）复合隔板，该隔板能有效阻止多硫化物穿梭，而不会因MOF的筛分作用而阻碍锂离子的迁移。此外，由于较高的Brunauer-Emmett-Teller（BET）表面积为1418 m ² g ^-1以及与MOF上的锆和氧的化学相互作用，多硫化物还可以物理和化学方式吸附在MOF的表面上，这进一步阻止了多硫化物穿梭通过MOF颗粒的晶间通道。此外，由于MOF上的-COOH和-OH的极性官能团，复合隔膜对电解质的润湿性得到了增强。具有复合隔板的电池在0.2C时的初始放电容量为1239 mA hg ^-1，在0.5C时的初始放电容量为1147.4 mA hg ^-1。可逆容量保持在964.1 mA hg ^-1，在0.5C下每个周期的平均衰减仅为0.08％。复合隔板在2C速率下的容量为955.8 mA hg ^-1，远高于原始分离器的289.2 mA hg ^-1。