The cycle life of rechargeable lithium (Li)‐metal batteries is mainly restrained by dendrites growth on the Li‐metal anode and fast depletion of the electrolyte. Here, we report on a stable Li‐metal anode enabled by interconnected two‐dimensional (2D) arrays of niobium nitride (NbN) nanocrystals as the Li host, which exhibits a high Coulombic efficiency (>99 %) after 500 cycles. Combining theoretical and experimental analysis, it is inferred that this performance is due to the intrinsic properties of interconnected 2D arrays of NbN nanocrystals, such as thermodynamic stability against Li‐metal, high Li affinity, fast Li⁺ migration, and Li⁺ transport through the porous 2D nanosheets. Coupled with a lithium nickel–manganese–cobalt oxide cathode, full Li‐metal batteries were built, which showed high cycling stability under practical conditions – high areal cathode loading ≥4 mAh cm⁻², low negative/positive (N/P) capacity ratio of 3, and lean electrolyte weight to cathode capacity ratio of 3 g Ah⁻¹. Our results indicate that transition metal nitrides with a rationally designed structure may alleviate the challenges of developing dendrite‐free Li‐metal anodes.

中文翻译：

---

氮化铌纳米晶体的互连二维阵列作为稳定的锂主体

可充电锂（Li）金属电池的循环寿命主要受到锂金属阳极上的树枝状晶体生长和电解质快速耗尽的限制。在这里，我们报告了一个稳定的锂金属阳极，该阳极通过互连的铌酸铌（NbN）纳米晶体的二维（2D）互连阵列作为锂主体，在500个循环后表现出较高的库仑效率（> 99％）。结合理论和实验分析，可以推断该性能归因于NbN纳米晶体互连2D阵列的固有特性，例如对Li-金属的热力学稳定性，高Li亲和力，快速的Li ⁺迁移和Li ⁺通过多孔的2D纳米片。结合锂镍-锰-钴氧化物正极，制造了完整的锂金属电池，该电池在实际条件下显示出高循环稳定性-高面积阴极负载≥4mAh cm ^-2，负/正（N / P）容量低比率为3，稀电解质重量与阴极容量之比为3 g Ah ^-1。我们的结果表明，结构合理设计的过渡金属氮化物可以缓解开发无枝晶的锂金属阳极的挑战。