The insulating nature of sulfur and the shuttling of polysulfides are two major fundamental issues that have to be tackled in Lithium-sulfur (Li-S) batteries, generally leading to low sulfur utilization and fast capacity decay. Constructing sulfur hosts with both excellent conductivity and efficient polysulfides immobilization is critical to the successful implementation of Li-S batteries. Herein, mesoporous molybdenum nitride (Mo₂N) with interconnected structures is readily designed as sulfur hosts to resolve the low conductivity and polysulfides dissolution issues. The specific surface area and the conductivity of the mesoporous Mo₂N are verified to be 121 m² g⁻¹ and 1 × 10⁵ S m⁻¹, respectively. Along with its high polarity enabling the chemisorption of polysulfides, the as-obtained mesoporous Mo₂N is promising as sulfur host. The polysulfides dissolution is efficiently suppressed owing to the fruitful nanospaces in the mesoporous Mo₂N that offer more exposed polar interfaces for intensive chemical affinity/adsorption with polysulfides. Encouragingly, the as-prepared mesoporous, conductive and polar Mo₂N with sulfur delivers superior capacity of 995 mA h g⁻¹, long cycle stability (91.9% capacity retention after 100 cycles), superior to those of Nonporous-Mo₂N/S and Mesoporous-MoO₃/S. Our results reveal that vivid engineering of metal nitrides via creating nanopores is promising for pursuing high-performance Li-S batteries.

硫的绝缘性和多硫化物的穿梭是锂硫（Li-S）电池必须解决的两个主要基本问题，通常会导致硫利用率低和容量衰减快。构建具有优异电导率和有效固定多硫化物的硫基质对于成功实施Li-S电池至关重要。在本文中，具有互连结构的中孔氮化钼（Mo ₂ N）易于设计为硫主体，以解决低电导率和多硫化物溶解问题。介孔Mo ₂ N的比表面积和电导率经验证为121 m ²  g ^-1和1×10 ⁵  S m ^-1， 分别。所获得的中孔Mo ₂ N的极性高，能够实现多硫化物的化学吸附，因此有望作为硫的主体。由于中孔Mo ₂ N中富有成果的纳米空间可有效抑制多硫化物的溶解，因此该纳米空间可提供更多暴露的极性界面，以增强与多硫化物的化学亲合力/吸附力。令人鼓舞的是，所制备的含硫的介孔，导电和极性Mo ₂ N具有995 mA h g ^-1的卓越容量，长循环稳定性（100次循环后91.9％的容量保持率），优于无孔Mo ₂ N / S和介孔MoO ₃/ S。我们的结果表明，通过创建纳米孔对金属氮化物进行生动的工程设计对于追求高性能Li-S电池很有希望。