The polysulfide shuttling and restricted kinetics of existing sulfur cathodes of lithium–sulfur batteries need to be tackled. Herein, we synthesized a polycarbonsulfide active material with an atomically assembled π-conjugated 3D conductive matrix via the self-polymerization of carbon disulfide (CS₂) monomers. The as-synthesized polycarbonsulfide features oligo-S heterocycles assembled to conjugated conductive carbon chains. The coupled lithium-polycarbonsulfide battery delivered a high capacity of 724.5 mAh g^–1 at 1.0 C (corresponding to 827.3 Wh kg^–1) with an ultralow capacity decay rate of 0.032% per cycle, as well as high-rate capability of 499.6 mAh g^–1 at 3.0 C. Multiple ex situ spectroscopic analyses revealed that the robust π-conjugated conductive polymeric matrix was well preserved during repeated battery operation, which efficiently tethered the discharge products to greatly restrict the shuttling effect.

中文翻译：

---

构建具有高能量密度和长循环寿命的锂-聚碳硫电池

需要解决锂硫电池现有硫正极的多硫化物穿梭和受限动力学问题。在此，我们通过二硫化碳 (CS ₂ ) 单体的自聚合合成了具有原子组装的 π 共轭 3D 导电基质的聚硫化碳活性材料。合成后的聚硫化碳具有组装到共轭导电碳链上的低聚 S 杂环。耦合的锂-聚碳硫电池在 1.0 C 时提供 724.5 mAh g ^–1的高容量（相当于 827.3 Wh kg ^–1），每个循环具有 0.032% 的超低容量衰减率，以及 499.6 mAh 的高倍率能力g ^–1在 3.0 C 下，多次非原位光谱分析表明，在电池反复运行过程中，坚固的 π 共轭导电聚合物基质得到了很好的保存，有效地束缚了放电产物，极大地限制了穿梭效应。