Sodium metal anodes combine low redox potential (−2.71 V versus SHE) and high theoretical capacity (1165 mAh g⁻¹), becoming a promising anode material for sodium‐ion batteries. Due to the infinite volume change, unstable SEI films, and Na dendrite growth, it is arduous to achieve a long lifespan. Herein, an oxygen‐doped carbon foam (OCF) derived from starch is reported. Heteroatom doping can significantly reduce the nucleation resistance of sodium metal; combined with its rich pore structure and large specific surface area, OCF provides abundant nucleation sites to effectively guide the nucleation and subsequent growth of sodium metal, and the nature of this foam can accommodate the deposited sodium. Furthermore, a more uniform, robust, and stable SEI layer is observed on the surface of OCF electrode, so it can maintain ultra‐high reversibility and excellent integrity for a long time without dendritic growth. As a result, when the current density is 10 mA cm⁻², the electrode can maintain stable 2000 cycles and the coulombic efficiency can reach to 99.83%. Na@OCF||Na₃V₂(PO₄)₃ full cell also has extremely high capacity retention of about 97.53% over 150 cycles. These results provide a simple but effective method for achieving the safety and commercialization of sodium metal anode.

中文翻译：

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用于高度可逆、超长循环钠金属阳极的具有亲钠表面的碳泡沫

钠金属负极结合了低氧化还原电位（−2.71 V vs SHE）和高理论容量（1165 mAh g ⁻¹），成为钠离子电池有前途的负极材料。由于无限的体积变化、不稳定的SEI膜以及钠枝晶的生长，很难实现长寿命。本文报道了一种源自淀粉的掺氧碳泡沫（OCF）。杂原子掺杂可以显着降低钠金属的成核阻力；结合其丰富的孔隙结构和大的比表面积，OCF提供了丰富的成核位点，可以有效引导钠金属的成核和随后的生长，并且这种泡沫的性质可以容纳沉积的钠。此外，在OCF电极表面观察到更均匀、坚固、稳定的SEI层，因此它可以长时间保持超高的可逆性和优异的完整性，而不会产生枝晶。结果，当电流密度为10 mA cm ^-2时，电极可以稳定稳定循环2000次，库仑效率可达99.83%。Na@OCF||Na ₃ V ₂ (PO ₄ ) ₃全电池在150次循环中还具有约97.53%的极高容量保持率。这些结果为实现钠金属阳极的安全性和商业化提供了一种简单而有效的方法。