Uncontrollable growth of sodium dendrite during repeated sodium plating/stripping process results in low Coulombic efficiency, short cycle life and safety problem of sodium metal batteries. Herein, cobalt-based metal organic frameworks (Co-MOFs) was chosen as precursor, a porous nitrogen-anchored carbon rhombic dodecahedron (CoNC) embedded with Co nanoparticles is designed to uniform Na nucleation and deposition for sodium metal anodes, integrating high surface area and high conductivity. Both DFT calculations and experiment results demonstrate that the CoNC can enhance the sodiophilic for sodium nucleation and deposition, encapsulating sodium into CoNC nanoparticles and realize a dendrite-free Na plating and stripping process. CoNC@Na symmetric cell exhibits stable cycle performance for 1200 ​h ​at 1.0 ​mA ​cm⁻² for 1.0 ​mAh cm⁻² with low nucleation overpotential. The CoNC@Na half cell can operate stable cycling with a superhigh average Coulombic efficiency of 99.6% for 400 cycles. Moreover, full cell paired with Na₃V₂(PO₄)₂F₃ (NVPF) cathode exhibits excellent cycling performance with a high reversible specific capacity of 113 ​mAh g⁻¹ and capacity retention of 90%. This offers a sight into the design of electrode for encapsulating sodium into carbon matrix by sodiophilic sites to uniform Na nucleation and growth for dendrite-free Na metal anodes.

在重复的钠电镀/剥离过程中钠树枝状晶体的不可控制的生长导致库仑效率低，循环寿命短和钠金属电池的安全性问题。在这里，选择钴基金属有机骨架（Co-MOFs）作为前体，并设计了嵌入钴纳米粒子的多孔氮锚定碳菱形十二面体（CoNC），以使钠金属阳极的钠成核和沉积均匀，并集成了高表面积和高导电性。DFT计算和实验结果均表明，CoNC可以增强亲钠性，促进钠成核和沉积，将钠包封到CoNC纳米颗粒中，并实现无枝晶的Na镀和剥离过程。CoNC @ Na对称电池在1.0 mA cm ^{-2的条件下}表现出1200 h的稳定循环性能1.0 mAh cm ^-2，低成核超电势。CoNC @ Na半电池可在400个循环中以99.6％的超高平均库仑效率运行稳定的循环。此外，与Na ₃ V ₂（PO ₄）₂ F ₃（NVPF）阴极配对的全电池具有出色的循环性能，具有113 mAh g ^-1的高可逆比容量和90％的容量保持率。这为将钠通过亲嗜性位点将碳包封到碳基质中以使钠均匀成核和生长而形成无枝晶的钠金属阳极的电极设计提供了机会。