发展室温钠/钾离子电池对于大规模储能领域具有重要的战略意义，而FeP2具有较高的储钠/钾理论容量、适宜的嵌Na+/K+电位，是一种非常具有吸引力的钠/钾离子电池负极材料。然而，这种材料存在脱嵌Na+/K+过程中体积变化较大、导电性较差的缺点，导致差的循环和倍率性能，此外，FeP2的储钠/钾机理还不明确。为解决以上问题，本项目通过设计构筑结构可控的FeP2超薄纳米片，对其进行掺杂、表面改性研究，并与MXene、磷烯、三维石墨烯构筑二维异质结，以提升其电化学性能。探索该复合材料的纳米片厚度、掺杂浓度、磷化方式、合成温度、复合方式等对其界面特性、微观结构等物化性能的影响规律。结合原位表征和第一性原理计算，阐明材料微观结构与电化学性能之间的构效关系与增效机制，揭示材料的储钠/钾机制，对于实现高比容量、长循环寿命和优异倍率性能的FeP2基钠/钾离子电池负极材料的可控制备具有重要的研究价值与实用意义。

The development of room temperature sodium/potassium-ion batteries is of great strategic significance for large-scale energy storage. The FeP2 is a kind of attractive anode material of sodium/potassium-ion batteries with high theoretical capacity and suitable Na+/K+ insertion potential. However, this material generally face the challenges of large volume change and poor conductivity during the Na+/K+ insertion/de-intercalation process, leading to poor cycling and rate performance. In addition, the sodium/potassium storage mechanism is still unclear. This project aims to improve the electrochemical performance by designing and constructing the ultra-thin FeP2 nanosheets, combining with surface modification, heteroatoms doping and compounding them with MXene、Phosphorus ene or three-dimensional graphene. Exploring the influence of nanosheet thickness, doping concentration, phosphating method, synthesis temperature and composite method on the physical and chemical properties of the interface, microstructure and other characteristics of the composite material. Combining in-situ characterization and first-principles calculations, clarifying the structure-activity relationship and synergistic mechanism between the microstructure and electrochemical performance and revealing the sodium/potassium mechanism show important research value and practical significance for achieving high specific capacity, long cycle life, and excellent rate capability FeP2 anode materials of sodium/potassium-ion batteries.