Abstract Because of the severe “shuttle effect” and poor conductivity of polysulfides for lithium‒sulfur batteries, some sulfur hosts as cathodes exhibit unsatisfying electrochemical performances. In this work, ZIF‑8 nanocrystals attached on reduced graphene oxide (ZIF‑8@rGO) was prepared through a hydrothermal process and subsequent in‑situ conversion reaction. When served as sulfur host for lithium‒sulfur batteries, the ZIF‑8@rGO/S nanocomposite delivered a discharge capacity of 523 mAh g‒1 for 0.2 A g‒1 over 200 cycles along with a high Coulombic efficiency, exhibiting an improved long‒term cycle stability. Such an improved cycle stability is related to the unique merits of ZIF‑8@rGO/S nanocomposite, including tight combination, excellent conductivity, abundant reactive sites and adequate specific surface area. Consequently, the in‑situ conversion reaction strategy could be also used to construct many other graphene‒based nanocomposites as sulfur hosts to enhance their electrochemical performances in lithium‒sulfur batteries.

中文翻译：

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一种简单的原位合成 ZIF-8 纳米粒子，锚定在还原氧化石墨烯上，作为锂硫电池的硫主体

摘要 由于锂硫电池多硫化物严重的“穿梭效应”和较差的导电性，一些硫主体作为正极表现出令人不满意的电化学性能。在这项工作中，通过水热工艺和随后的原位转化反应制备了附着在还原氧化石墨烯 (ZIF-8@rGO) 上的 ZIF-8 纳米晶体。当用作锂硫电池的硫主体时，ZIF‑8@rGO/S 纳米复合材料在 0.2 A g-1 的 200 次循环中提供 523 mAh g-1 的放电容量以及高库仑效率，表现出改善的长‒ 期限周期稳定性。这种改进的循环稳定性与 ZIF‑8@rGO/S 纳米复合材料的独特优点有关，包括紧密结合、优异的导电性、丰富的反应位点和足够的比表面积。最后，