Sodium manganese hexacyanoferrate, also called Prussian white (PW), has attracted much attention as a promising cathode material for Na-ion batteries due to its high-voltage platform and inexpensive elemental composition. However, their parasitic vacancies and water molecules often deteriorate the electrochemical performance. Proper regulation of such defects in scale-up preparation is still a challenge. In this work, PW was prepared via aqueous precipitation assisted by manganese oxalate in a 10 L reactor. High-quality Na_2.32Mn[Fe(CN)₆]_0.95□_0.05·1.97 H₂O was obtained and exhibited a specific capacity of 148 mAh g^–1. The phase transition from monoclinic to rhombohedral during long-term cycling for such an ultra-Na-rich cathode has been first reported. In addition, the vacuum drying temperature was further discussed, and 150 °C is more suitable for achieving the balance between dehydration and electrical properties.

中文翻译：

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草酸锰辅助钠离子电池的富 Na 普鲁士白阴极的放大制备


六氰基铁酸锰钠，也称为普鲁士白 （PW），由于其高压平台和廉价的元素组成，作为一种很有前途的钠离子电池正极材料而备受关注。然而，它们的寄生空位和水分子往往会使电化学性能恶化。在放大制备中正确调节此类缺陷仍然是一项挑战。在本工作中，通过在草酸锰的辅助下在 10 L 反应器中通过水沉淀制备 PW。获得高质量的 Na_2.32Mn[Fe（CN）₆]_0.95□_0.05·1.97 H₂O，比容量为 148 mAh g^–1。这种超富含 Na 的阴极在长期循环过程中从单斜晶相变为菱面体的相变已首次被报道。此外，进一步讨论了真空干燥温度，150 °C 更适合实现脱水和电性能之间的平衡。