Owing to high aspect ratio of edge sites and superior catalytic activity, atomically thin transition metal dichalcogenides (TMDCs) show great promise to tailor the electrolyte/electrode interface properties for high performance lithium-sulfur battery (Li–S battery). However, the TMDCs that engineer the electrode/electrolyte interface are usually produced through chemical hydrothermal methods, which show low crystallinity and thick multilayer structure. Herein, a highly crystalline and atomically thin tungsten disulfides on carbon cloth (WS₂@CC) was developed via chemical vapor deposition (CVD) and served as an effective electrode/electrolyte interface for Li–S battery. Our results demonstrate that the atomically thin WS₂ with high crystal quality and abundant edges sites can effectively accelerates the redox kinetics of sulfur/lithium polysulfides and regulates the precipitation/decomposition of insoluble Li₂S. More importantly, it was revealed that the hierarchical flower-stacked WS₂ with excessive exposed catalytic edges shows extremely strong polysulfide adsorption, which causes the sulfur species aggregation and passivation on the WS₂@CC surface, thus resulting in deformed rate performance and poor cycling stability as compared to the few-layer WS₂@CC. Our work provides a new insight into the structural engineering of TMDCs by CVD for Li–S battery, and suggests the importance of rational chemisorption and catalysis of the interface to realize the high-performance Li–S battery.

由于边缘位点的高长宽比和出色的催化活性，原子稀薄的过渡金属二硫化碳（TMDC）显示出为高性能锂硫电池（Li–S电池）定制电解质/电极界面特性的巨大希望。但是，设计电极/电解质界面的TMDC通常是通过化学水热方法生产的，该方法显示出较低的结晶度和较厚的多层结构。在此，通过化学气相沉积（CVD）在碳布（WS ₂ @CC）上开发了高度结晶且原子薄的二硫化钨，并用作Li-S电池的有效电极/电解质界面。我们的结果表明，原子稀薄的WS ₂具有高晶体质量和丰富边缘位点的金属可以有效地促进硫/多硫化锂的氧化还原动力学，并调节不溶性Li ₂ S的沉淀/分解。更重要的是，揭示了带有过多暴露的催化边缘的分层花状WS ₂示出非常强的多硫化物吸附，使硫物质聚集和WS上钝化₂ @CC表面，从而导致变形率性能和差的循环稳定性相比，少层WS ₂@CC。我们的工作为Li-S电池的CVD TMDCs的结构工程提供了新的见解，并提出了合理化学吸附和界面催化对实现高性能Li-S电池的重要性。