Xie Qun, Guan Yunfeng, Xu Zhangwei, Zhu Hui, Jin Yi, Zhang Qin, Dong Zhijun, Yuan Guanming, Li Xuanke, Cong Ye
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, PR China.
Key Laboratory for Polymerization Engineering and Technology of Ningbo, School of Materials Science and Chemical Engineering, Ningbo University of Technology (NBUT), Ningbo 315016, PR China.
J Colloid Interface Sci. 2023 Nov 15;650(Pt A):798-806. doi: 10.1016/j.jcis.2023.06.166. Epub 2023 Jun 25.
Ferroferric oxide (FeO) as an anode material of lithium-ion battery has been widely investigated due to its high theoretical capacity, environmental friendliness, natural abundance, and low cost. However, it suffers from severe aggregation and volume expansion during energy storage. Herein, we rationally construct an advanced FeN@FeO/VN heterostructure via a hydrothermal and followed nitridation process, where the wrapping of conductive FeN on the surface of FeO effectively improves the electron conductivity and alleviates the volume expansion, and VN inhibits the agglomeration of FeN@FeO. Benefiting from the dual conductive confinements and promoted interfacial charge transfer, the FeN@FeO/VN heterojunction exhibits excellent rate capability and cycling stability. It possesses the highest reversible capacity of 420.8 mAh g at 1 A g after 600 cycles, which is three times that of FeO. Furthermore, a full cell based on a FeN@FeO/VN anode and a LiFePO cathode delivers considerable electrochemical performance. This work demonstrates that FeN@FeO/VN is a potential anode material and provides a model in constructing other high-performance electrode materials.
作为锂离子电池的阳极材料，三氧化二铁（FeO）因其高理论容量、环境友好性、天然丰度和低成本而受到广泛研究。然而，它在储能过程中会发生严重的团聚和体积膨胀。在此，我们通过水热法和随后的氮化过程合理构建了一种先进的FeN@FeO/VN异质结构，其中FeO表面包裹的导电FeN有效提高了电子导电性并减轻了体积膨胀，而VN抑制了FeN@FeO的团聚。受益于双重导电限制和促进的界面电荷转移，FeN@FeO/VN异质结表现出优异的倍率性能和循环稳定性。在600次循环后，它在1 A g下具有420.8 mAh g的最高可逆容量，是FeO的三倍。此外，基于FeN@FeO/VN阳极和LiFePO阴极的全电池具有相当可观的电化学性能。这项工作表明FeN@FeO/VN是一种潜在的阳极材料，并为构建其他高性能电极材料提供了一个模型。
