Lithium-sulfur chemistry is currently being explored as a mechanism for electricity storage because it promises high energy capacities and low costs. However, practical applications of lithium-sulfur batteries (LSBs) are severely limited by the short cycle life caused by the polysulfide shuttling (PSS) effect. Herein, we report on a PSS-resistant yet redox-active sulfur host containing N-doped carbon dodecahedra supported cobalt single atoms (denoted as Co–SAs@NC) derived from a binary Co–Zn MOF-precursor. The results show that the sulfur cathode built on the Co–SAs@NC is electrocatalytically active towards soluble-polysulfides-to-insoluble-Li₂S conversion, thus mitigating the detrimental PSS effect. The LSB using this new sulfur host exhibits a 600-cycle stable operation with a capacity of 737 mAh g⁻¹ at 1C and 2.0 ​mg ​cm⁻² S-loading. At a higher sulfur loading of 5.0 ​mg ​cm⁻², it can still deliver a high initial discharge capacity of 1069 mAh g⁻¹ at 0.1C and maintain 400 mAh g⁻¹ at 1C for 150 cycles. Theoretical analysis suggests that the Co–N₄ moiety in the Co–SAs@NC is fundamentally responsible for the observed activity and stability.

锂硫化学作为一种蓄电机制正在被探索，因为它有望实现高能量容量和低成本。但是，锂硫电池（LSB）的实际应用受到多硫化物穿梭（PSS）效应导致的短循环寿命的严重限制。在此，我们报道了一种抗PSS且具有氧化还原活性的硫主体，该主体包含N掺杂的碳十二面体支持的钴单原子（表示为Co-SAs @ NC），其衍生自二元Co-Zn MOF前体。结果表明，建立在Co-SAs @ NC上的硫阴极对可溶性多硫化物向不溶性Li ₂ S的转化具有电催化活性，从而减轻了有害的PSS效应。使用这种新型硫磺主体的LSB具有600循环的稳定运行能力，容量为737 mAh g在1C和2.0 mg·cm ⁻² S负载下为^-1。在5.0 mg·cm ^-2的较高硫负荷下，它仍可在0.1C时提供1069 mAh g ^-1的高初始放电容量，并在1C时保持400 mAh g ^-1的150个循环。理论分析表明，Co-SAs @ NC中的Co-N ₄部分是观察到的活性和稳定性的根本原因。