The polysulfide (PS) shuttle mechanism (PSM) is one of the biggest problems of lithium–sulfur (Li–S) batteries, resulting in fast capacity fading and low Coulombic efficiency. Due to electrostatic interactions, polar materials can adsorb the PS intermediates on their surfaces, decreasing the PSM effect. These polar materials should also have high electronic conductivity and surface area to be used in sulfur cathodes of Li–S batteries. In this respect, metal‐organic frameworks (MOF) and their derivatives gain significant attention. In this work, UiO‐66/graphene nanoplatelet (GNP)/sulfur composites are prepared with different UiO‐66/GNP ratios to investigate the effect of MOF amount on the electrochemical performance of Li–S batteries. MOF amount in the composite does not significantly influence performance for moderate S loadings. In contrast, Li–S cells with higher MOF‐loaded cathodes present superior performance at higher sulfur loadings and C rates.

中文翻译：

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金属有机框架/石墨烯纳米片复合材料提高锂硫电池的倍率性能

多硫化物（PS）穿梭机制（PSM）是锂硫（Li-S）电池的最大问题之一，导致容量快速衰减和库仑效率低。由于静电相互作用，极性材料可以将PS中间体吸附在其表面，从而降低PSM效应。这些极性材料还应具有高电子电导率和表面积，可用于锂硫电池的硫正极。在这方面，金属有机框架（MOF）及其衍生物引起了广泛关注。在这项工作中，以不同的UiO-66/GNP比例制备了UiO-66/石墨烯纳米片（GNP）/硫复合材料，以研究MOF含量对Li-S电池电化学性能的影响。复合材料中 MOF 的含量不会显着影响中等硫负载量的性能。相比之下，具有较高 MOF 负载量的正极的 Li-S 电池在较高的硫负载量和 C 倍率下表现出优异的性能。