Prussian blue analogs (PBAs) are especially investigated as superior cathodes for sodium‐ion batteries (SIBs) due to high theoretical capacity (≈170 mA h g⁻¹) with 2‐Na storage and low cost. However, PBAs suffer poor cyclability due to irreversible phase transition in deep charge/discharge states. PBAs also suffer low crystallinity, with considerable [Fe(CN)₆] vacancies, and coordinated water in crystal frameworks. Presently, a new chelating agent/surfactant coassisted crystallization method is developed to prepare high‐quality (HQ) ternary‐metal Ni_xCo_1−x[Fe(CN)₆] PBAs. By introducing inactive metal Ni to suppress capacity fading caused by excessive lattice distortion, these PBAs have tunable limits on depth of charge/discharge. HQ‐Ni_xCo_1−x[Fe(CN)₆] (x = 0.3) demonstrates the best reversible Na‐storage behavior with a specific capacity of ≈145 mA h g⁻¹ and a remarkably improved cycle performance, with ≈90% capacity retention over 600 cycles at 5 C. Furthermore, a dual‐insertion full cell on the cathode and NaTi₂(PO₄)₃ anode delivers reversible capacity of ≈110 mA h g⁻¹ at a current rate of 1.0 C without capacity fading over 300 cycles, showing promise as a high‐performance SIB for large‐scale energy‐storage systems. The ultrastable cyclability achieved in the lab and explained herein is far beyond that of any previously reported PBA‐based full cells.

中文翻译：

---

基于高质量三元金属普鲁士蓝类似物的双插入型钠离子全电池

普鲁士蓝类似物（PBA）作为钠离子电池（SIB）的优质阴极，由于其理论容量高（≈170mA hg ^-1），可存储2-Na，且成本低廉，因此被专门研究。但是，由于深充电/放电状态下不可逆的相变，PBA的可循环性较差。PBA还具有较低的结晶度，具有相当大的[Fe（CN）₆ ]空位，并且在晶体骨架中配位有水。目前，开发了一种新的螯合剂/表面活性剂辅助结晶方法，以制备高质量（HQ）三元金属Ni _x Co _{1- x} [Fe（CN）₆] PBA。通过引入惰性金属Ni来抑制由于过度晶格畸变引起的电容衰减，这些PBA在充电/放电深度上具有可调的极限。HQ‐Ni _x Co ₁ - _x [Fe（CN）₆ ]（x = 0.3）表现出最佳的可逆Na存储性能，比容量≈145mA hg ^-1，循环性能显着提高，≈90％在5 C下经过600次循环可保持最大容量。此外，阴极和NaTi ₂（PO ₄）₃阳极上的双插入全电池可提供约110 mA hg ^-1的可逆容量以1.0 C的电流速率运行，且容量不会超过300次循环，这显示出有望成为用于大型储能系统的高性能SIB。在实验室中实现并在此说明的超稳定循环性远远超出了以前报道的任何基于PBA的全细胞。