Aqueous potassium-ion batteries (AKIBs) with high-safety, low-cost and environmental-friendliness are competitive candidates in the field of energy storage. However, concerns on their inferior durability, poor rate-capability as well as limited selection of suitable electrode materials greatly restrict their progress. Herein, ordered arrays which are assembled from potassium mediated Co–Fe based Prussian blue (KCoFe-PB) hollow multivoid nanocuboids (HMCs) are employed as cathodes for AKIBs. The ordered arrangement of the assembly, the hollow centered nature of the HMCs, and the 3D crystal framework of KCoFe-PB synergistically facilitate the electron/ion transport, which ensures fast kinetics and good stable cycling performance. Theoretical calculations disclose the facile potassium migration pathway with a low energy barrier, and the experimental results reveal the multiple-electron-transfer processes of KCoFe-PBA HMCs in the aqueous potassium-ion system. The full AKIB which is built from the high-performance KCoFe-PBA HMC cathode, organic (PTCDI) anode, and water-in-salt electrolyte (WiSE) achieves excellent energy density, high power density, and fabulous capacity retention after long-term cycling (79% after 3000 cycles). More impressively, the fabricated pouch-type AKIB is able to operate smoothly at high rates (0.5 to 6C) in a wide temperature range (−20 to 40 °C), which testifies its superior adaptability to temperature change. Therefore, this work not only gives a new clue to fabricate fast and durable electrodes for AKIBs, but also promotes the innovation of high-performance power sources for all-climate energy storage.

中文翻译：

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六氰合铁酸钴钴中空多空隙纳米长方体阵列的有序组装，用于高性能水系钾离子电池，用于全气候储能

具有高安全性、低成本和环保的水系钾离子电池（AKIBs）是储能领域的竞争候选者。然而，对其耐久性差、倍率能力差以及合适电极材料选择有限的担忧极大地限制了它们的进展。在此，由钾介导的 Co-Fe 基普鲁士蓝 (KCoFe-PB) 中空多空隙纳米立方体 (HMC) 组装而成的有序阵列被用作 AKIBs 的阴极。组装的有序排列、HMC 的中空中心特性和 KCoFe-PB 的 3D 晶体框架协同促进了电子/离子传输，从而确保了快速的动力学和良好的稳定循环性能。理论计算揭示了具有低能垒的简便钾迁移途径，实验结果揭示了KCoFe-PBA HMCs在钾离子水溶液体系中的多电子转移过程。完整的 AKIB 由高性能 KCoFe-PBA HMC 正极、有机 (PTCDI) 负极和盐包水电解质 (WiSE) 构成，可实现出色的能量密度、高功率密度和出色的长期容量保持率循环（3000 次循环后为 79%）。更令人印象深刻的是，制造的袋式AKIB能够在宽温度范围（-20至40°C）内以高速率（0.5至6C）平稳运行，这证明了其对温度变化的出色适应性。因此，这项工作不仅为制造快速耐用的 AKIBs 电极提供了新线索，而且促进了全气候储能高性能电源的创新。