Lithium–sulfur batteries are one of the most promising next-generation batteries due to their high theoretical specific capacity, but are impeded by the low utilization of insulating sulfur, unstable morphology of the lithium metal anode, and transport of soluble polysulfides. Here, by coating a layer of nano titanium dioxide and carbon black onto a commercial polypropylene separator, we demonstrate a new composite separator that can confine the polysulfides on the cathode side, forming a catholyte chamber, and at the same time block the dendritic lithium on the anode side. Lithium–sulfur batteries using this separator show a high initial capacity of 1206 mA h g?1 and a low capacity decay rate of 0.1% per cycle at 0.5C. Analyses reveal the electrocatalytic effect and the excellent dendrite-blocking capability of the ～7 μm thick coating.
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机译：锂硫电池由于其较高的理论比容量而成为最有前途的下一代电池之一，但由于绝缘硫的利用率低，锂金属阳极的形态不稳定以及可溶性多硫化物的运输而受到阻碍。在这里，通过在商用聚丙烯隔膜上涂覆一层纳米二氧化钛和炭黑，我们展示了一种新型复合隔膜，该隔膜可以将多硫化物限制在阴极侧，形成阴极电解液室，同时阻挡树突状锂阳极侧。使用该隔膜的锂硫电池在1°C时显示出1206 mA h g ？1 的高初始容量，在0.5C时每个循环的容量衰减率仅为0.1％。分析表明，约7μm厚的涂层具有良好的电催化作用和出色的枝晶阻挡能力。
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