Commercial application of Li–S batteries is greatly restricted by their unsatisfactory cycle retention and poor cycling life originating from the lithium polysulfide (LiPS) shuttling effect and sluggish sulfur redox kinetics. Various strategies have been proposed to boost the performances of Li–S batteries, including nanostructured sulfur composites, functional separators/interlayers, electrode/electrolyte additives, and so on. However, how to combine two or more strategies to efficiently settle these challenging issues confronted by Li–S batteries is in desperate need. Here, we demonstrate a powerful combined strategy of introducing novel 3D WS₂/carbon nanotube (CNT) networks built by hybridization of 1D CNTs with 2D WS₂ into Li–S batteries, simultaneously serving as a functional cathode additive and separator coating. Such 3D WS2/CNTs networks with abundant edge sites, a large active surface, and a fast electron pathway twice perform functions from the cathode side and separator surface: (1) to suppress polysulfide diffusion through a physical barrier and chemical interactions; (2) to accelerate LiPS conversion reactions; and (3) to enhance conductivity for better sulfur reactivation and high utilization. As a result, the as-built WS2/CNTs-incorporated battery configuration achieves a commendable combination of capacity, rate, and cycle stability (1491 mA h g^–1 at 0.2 C, 754 mA h g^–1 at 5 C, and initial capacity of 1069 mA h g^–1 with an ultralow decay rate of 0.040% per cycle over 1000 cycles at 1 C) along with remarkably mitigated anode corrosion and low self-discharge.

中文翻译：

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3D 二硫化钨/碳纳米管网络作为稳定和快速锂硫电池的隔离涂层和阴极添加剂

由于多硫化锂（LiPS）穿梭效应和缓慢的硫氧化还原动力学，锂硫电池的循环保持率和循环寿命不令人满意，因此其商业应用受到极大限制。已经提出了各种策略来提高锂硫电池的性能，包括纳米结构的硫复合材料、功能性隔膜/夹层、电极/电解质添加剂等。然而，迫切需要如何结合两种或多种策略来有效解决锂硫电池面临的这些具有挑战性的问题。在这里，我们展示了一种强大的组合策略，即引入通过 1D CNT 与 2D WS ₂杂交构建的新型 3D WS ₂ /碳纳米管 (CNT) 网络用于锂硫电池，同时用作功能性阴极添加剂和隔膜涂层。这种具有丰富边缘位点、大活性表面和快速电子通路的 3D WS2/CNTs 网络在阴极侧和隔膜表面执行两次功能：（1）通过物理屏障和化学相互作用抑制多硫化物扩散；(2)加速LiPS转化反应；(3) 提高电导率，以实现更好的硫再活化和高利用率。其结果是，已建成的WS2 /碳纳米管并入电池配置达到容量，速率和循环稳定性（1491毫安Hg的值得称赞组合^-1以0.2C，754毫安汞柱^-1在5℃，和初始容量1069 毫安汞^–1 在 1 C 下在 1000 次循环中具有每循环 0.040% 的超低衰减率）以及显着减轻的阳极腐蚀和低自放电。