Iron nitrides are considered as highly promising anode materials for lithium-ion batteries because of their nontoxicity, high abundance, low cost, and higher electrical conductivity. Unfortunately, their limited synthesis routes are available and practical application is still hindered by their fast capacity decay. Herein, a facile and green route is developed to synthesize Fe₄N/Fe₂O₃/Fe/porous N-doped carbon nanosheet composite. The size of Fe₄N/Fe₂O₃/Fe particles is small (10–40 nm) and they are confined in porous N-doped carbon nanosheet. These features are conducive to accommodate volume change well, shorten the diffusion distance and further elevate electrical conductivity. When tested as anode material for lithium-ion batteries, a high discharge capacity of 554 mA h g⁻¹ after 100 cycles at 100 mA g⁻¹ and 389 mA h g⁻¹ after 300 cycles at 1000 mA g⁻¹ are retained. Even at 2000 mA g⁻¹, a high capacity of 330 mA h g⁻¹ can be achieved, demonstrating superior cycling stability and rate performance. New prospects will be brought by this work for the synthesis and the potential application of iron nitrides materials as an anode for LIBs.

氮化铁由于其无毒，高丰度，低成本和较高的电导率而被认为是锂离子电池极有希望的负极材料。不幸的是，它们的合成路线有限，并且其快速的容量衰减仍然阻碍了实际应用。在本文中，开发了一种简便且绿色的路线来合成Fe ₄ N / Fe ₂ O ₃ / Fe /多孔N掺杂碳纳米片复合材料。Fe ₄ N / Fe ₂ O _3的大小/ Fe颗粒很小（10–40 nm），它们被限制在多孔的N掺杂碳纳米片中。这些特征有利于很好地适应体积变化，缩短扩散距离并进一步提高电导率。当作为锂离子电池的负极材料进行测试时，在100 mA g ^-1下100个循环后保持554 mA h g ^-1的高放电容量，在1000 mA g ^-1下300个循环后保持389 mA h g ^-1的高放电容量。即使在2000 mA g ^-1时，330 mA h g ^-1的高容量可以实现，显示出卓越的循环稳定性和速率性能。这项工作将为氮化铁材料作为LIB的阳极的合成和潜在应用带来新的前景。