Fe₂O₃ becomes a prospective anode for lithium-ion batteries (LIBs) benefiting from its inexpensive, abundant reserves, environmental friendliness and particularly high theoretical capacity. Unfortunately, the low electron/ion conductivity and severe volume expansion of approximately 200% during charging and discharging retard its practical application. Herein, we elaborately designed a sandwich-structured hybrid of Fe₂O₃ nanoparticles anchored in N-doped carbon nanosheets (Fe₂O₃/NCN). Thereinto, NCN can improve the electron/ion conduction ability and avoid the volume variation during cycling. When used as LIBs anode, Fe₂O₃/NCN possesses excellent electrochemical performance with a discharge specific capacity of 1059 mAh g⁻¹ after 500 cycles at 500 mA g⁻¹ and even 348 mAh g⁻¹ at 15 A g⁻¹. This work demonstrates a new strategy for designing versatile structures for other advanced LIBs anode materials.

Fe ₂ O ₃因其价格低廉、储量丰富、环境友好和特别高的理论容量而成为锂离子电池（LIB）的潜在负极。不幸的是，低电子/离子电导率和充电和放电过程中约200%的严重体积膨胀阻碍了其实际应用。在此，我们精心设计了一种夹层结构的 Fe ₂ O ₃纳米颗粒杂化物，其锚定在 N 掺杂的碳纳米片中（Fe ₂ O ₃ /NCN）。其中，NCN可以提高电子/离子传导能力，避免循环过程中的体积变化。用作LIBs阳极时，Fe ₂ O ₃/NCN具有优异的电化学性能，在500 mA g ^{-1 500次循环后的放电比容量为1059 mAh g -1}，在15 A g ^-1下甚至达到348 mAh g ^-1。这项工作展示了一种为其他先进的锂离子电池负极材料设计多功能结构的新策略。