Facilitating phase conversion efficiency of Li polysulfides to Li₂S and restraining the dissolution of Li polysulfides are critical for stable lithium–sulfur (Li–S) batteries. Herein, an in situ formed sulfiphilic superfine Fe₂O₃ nanocrystals confined in lithiophilic N-doped microporous carbon (Fe₂O₃/N-MC) is derived from one-step hypercrosslinked polymerization. Uniquely, the dual active sites (Fe₂O₃ and N) in Fe₂O₃/N-MC tend to form “FeS, LiO or LiN” bonding, and then synchronically enhancing the chemisorption and interface conversion ability of Li polysulfides. As a result, 80 wt% S is loaded on Fe₂O₃/N-MC and the hybrid cathode delivers high mass capacity (730 mA h g^-1) and excellent cycling stability (87.1% capacity retention over 1000 cycles at 5.0 C). Especially, the cathode also exhibits a high reversible areal capacity of 3.69 mA h cm^-2 at a high areal loading (5.1 mg cm^-2) and a lean electrolyte/sulfur (E/S) ratio (7.5 µL mg^-1) over 500 cycles. This work is anticipated to deepen the comprehension of complex Li polysulfides interphase conversion processes and afford new thoughts for designing new host materials.

中文翻译：

---

超交联聚合使 N 掺杂碳限制 Fe2O3 促进 Li-S 电池的锂多硫化物界面转换

促进锂多硫化物向 Li ₂ S 的相转换效率并抑制多硫化锂的溶解对于稳定的锂硫 (Li-S) 电池至关重要。在此，限制在亲锂 N 掺杂微孔碳 (Fe ₂ O ₃ /N-MC)中的原位形成的亲硫超细 Fe ₂ O ₃纳米晶体来自一步超交联聚合。独特的是，Fe ₂ O ₃ /N-MC 中的双活性位点（Fe ₂ O ₃和 N）倾向于形成“Fe  S、Li  O 或 Li N”键，然后同步增强锂多硫化物的化学吸附和界面转换能力。因此，80 wt% 的 S 负载在 Fe ₂ O ₃ /N-MC 上，混合正极具有高容量（730 mA hg ^-1）和出色的循环稳定性（5.0 C 下 1000 次循环后容量保持率为 87.1%） . 特别是，在高面积负载 (5.1 mg cm ^-2 ) 和贫电解质/硫 (E/S) 比 (7.5 µL mg ^-1 ) 下，正极还表现出 3.69 mAh cm ^-2的高可逆面积容量。500 次循环。这项工作有望加深对复杂锂多硫化物相间转化过程的理解，并为设计新的主体材料提供新的思路。