Lithium-sulfur (Li-S) battery is one of the most promising energy storage systems due to its large energy density of 2560 Wh kg⁻¹. However, severe shuttle effect of polysulfide intermediates, poor conductivity of S and large volume change during cycling cause fast capacity fading and poor cycle performance. Herein, we demonstrate S nanodots impregnated microporous carbon encapsulated conductive mesoporous vanadium nitride nanowires (S/[email protected] NWs) as high-performance S cathode materials for Li-S batteries. The S nanodots with the size of 2–5 nm are impregnated into the mesopores of [email protected] NWs and further encapsulated with microporous carbon. During cycling, the polysulfides intermediates are strongly chemical anchored by the conductive MVN NWs and further physically trapped by microporous carbon coating within the cathode. The freestanding and binder-free cathode comprising intertwining and interpenetrating S/[email protected] NWs demonstrates highly mechanical flexibility, which deliver a long cycle life of 636 mAh g⁻¹ after 200 cycles at 1 C (1650 mA g⁻¹) and high rate performance with a capacity of 543 mAh g⁻¹ at 10 C. Even at a high areal mass loading of 9.7 mg cm⁻², a large and stable capacity of 7.1 mAh cm⁻² is achieved. The strategy combining microporous carbon coating with high conducting mesoporous metal nitrides opens a feasible route to design large-capacity and high-stability S-based cathodes for Li-S batteries.

锂硫（Li-S）电池因其2560 Wh kg ^-1的大能量密度而成为最有前途的储能系统之一。但是，多硫化物中间体的严重穿梭效应，S的差电导率和循环过程中的大体积变化会导致快速容量衰减和较差的循环性能。在这里，我们演示了S纳米点浸渍微孔碳封装的导电介孔氮化钒纳米线（S / [受电子邮件保护] NWs）作为Li-S电池的高性能S阴极材料。将大小为2–5 nm的S纳米点浸入[受电子邮件保护的] NW的中孔中，并进一步用微孔碳包裹。在循环过程中，多硫化物中间体被导电的MVN NW牢固地化学锚定，并被阴极内的微孔碳涂层进一步物理俘获。^-1 1个C（1650毫安克200次循环后^-1）和高倍率性能，其容量为543毫安时的克^-1在10℃甚至在9.7毫克厘米高面积质量负载^-2，大和稳定达到7.1 mAh cm ^-2的容量。将微孔碳涂层与高导电性介孔金属氮化物相结合的策略为设计用于Li-S电池的大容量和高稳定性S基阴极提供了一条可行的途径。