Due to the high theoretical capacity of sulfur (1675mAhg−1), low cost and environmental friendliness, lithium-sulfur batteries have shown broad prospects in future energy conversion and storage systems. However, the shuttle effect and insulating properties of sulfur restrict its practical application. Herein, we report a facile approach to fabricate Al-TDC@S-PPy composite material as lithium-sulfur battery electrode. In this strategy, a topological porous Al-TDC (TDC=2,5-thiophenedicarboxylate) with 8-connected clusters is reported, which can provide strong adsorption for dissolved intermediate polysulfides and alleviate volume expansion. Meanwhile, Polypyrrole, (PPy) as a conductive and flexible additive to expedite electron transport, improves electrical conductivity. Consequently, the Al-TDC@S-PPy composite cathode exhibits a higher initial specific capacity (1310.4mAhg−1 at 0.2C). The final reversible capacity is 411.0mAhg−1 after 200 cycles at 1 C. We can extend this strategy to other metal-organic frameworks (MOFs) and manufacture MOF/conductive polymer composite electrodes for high-performance lithium-sulfur batteries.

中文翻译：

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聚吡咯涂层Al-TDC复合结构作为锂硫电池正极

由于硫的高理论容量（1675毫安时G-1)、低成本和环境友好，锂硫电池在未来的能量转换和存储系统中展现出广阔的前景。然而，硫的穿梭效应和绝缘性能限制了其实际应用。在此，我们报告了一种简便的方法来制造 Al-TDC@S-PPy 复合材料作为锂硫电池电极。在该策略中，拓扑多孔 Al-TDC (贸发局=2,5-噻吩二羧酸盐）具有 8 个连接的簇，它可以为溶解的中间体多硫化物提供强吸附并减轻体积膨胀。同时，聚吡咯 (PPy) 作为一种导电和柔性添加剂，可加快电子传输，提高导电性。因此，Al-TDC@S-PPy 复合正极表现出更高的初始比容量（1310.4毫安时G-1在 0.2C）。最终可逆容量为 411.0毫安时G-1在 1 C 下循环 200 次后。我们可以将此策略扩展到其他金属有机框架 (MOF)，并制造用于高性能锂硫电池的 MOF/导电聚合物复合电极。