Rationally engineering flexible anodes with electrochemical and mechanical robustness while maintaining structural integrity is highly desirable for the realization of high-performance flexible lithium-ion batteries (LIBs). Herein, an integrated flexible anode composed of porous FeP nanocrystals/N-doped C frameworks and a conductive carbon cloth skeleton (FeP/NC@CC) that is constructed using amine-functionalized Fe-MOFs as precursors to achieve efficient interfacial modulation is reported. The FeP/NC frameworks derived from the Fe-MOFs can anchor firmly on the acidized CC skeleton, avoiding shedding of active materials with a high mass loading. The FeP nanocrystals embedded in the NC frameworks not only improve their electrical conductivity, but also form a stable solid electrolyte interphase (SEI) layer on the anode surface to prevent structural degradation and unfavorable side reactions for high cycling efficiency. In addition, the porous structure can facilitate electrolyte penetration and effectively accommodate mechanical strain from the volume change of FeP. Benefiting from the unique structure, FeP/NC@CC delivers a reversible areal capacity (5.8 mA h cm⁻² at 0.15 mA cm⁻²) with a high initial coulombic efficiency of 80.5% and excellent rate capability (2.0 mA h cm⁻² at 6.0 mA cm⁻²). The full cell composed of FeP/NC@CC and LiFePO₄ also shows good cycling stability.

中文翻译：

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界面调制实现了 FeP/N 掺杂的 C@carbon 布的柔性阳极，具有用于高面积容量锂存储的坚固结构

合理设计具有电化学和机械稳健性同时保持结构完整性的柔性阳极对于实现高性能柔性锂离子电池 (LIB) 是非常理想的。本文报道了一种由多孔 FeP 纳米晶体/N 掺杂 C 骨架和导电碳布骨架 (FeP/NC@CC) 组成的集成柔性阳极，该骨架使用胺官能化的 Fe-MOFs 作为前驱体构建，以实现有效的界面调制。源自 Fe-MOFs 的 FeP/NC 框架可以牢固地锚定在酸化的 CC 骨架上，避免高质量负载的活性材料脱落。嵌入在 NC 框架中的 FeP 纳米晶体不仅提高了它们的导电性，但也在阳极表面形成稳定的固体电解质中间相 (SEI) 层，以防止结构退化和不利的副反应，从而提高循环效率。此外，多孔结构可以促进电解质渗透并有效地适应 FeP 体积变化引起的机械应变。受益于独特的结构，FeP/NC@CC 提供了可逆的面积容量（5.8 mA h cm^-2 at 0.15 mA cm ^-2）具有 80.5% 的高初始库仑效率和出色的倍率性能（2.0 mA h cm ^-2 at 6.0 mA cm ^-2）。由 FeP/NC@CC 和 LiFePO ₄组成的全电池也显示出良好的循环稳定性。