Aqueous zinc‐ion batteries (ZIBs) have attracted widespread attention due to their advantages in safety and environmental benignity. However, achieving a cathode material with stable electrochemical performance for such a system remains an ongoing challenge. Herein, a K_0.5V₂O₅ cathode has been designed and synthesized by intercalating of K⁺ into V₂O₅, thus constructing a stable crystal structure by forming chemical bonds between V₂O₅ layers. The successful intercalation of K⁺ has been confirmed by a series of experimental tests and Vienna Ab‐initio Simulation Package simulation. These layer‐interlinking chemical bonds act as “pillars” to strongly hold the V₂O₅ layers together and protect them from dissolution. Furthermore, the K_0.5V₂O₅ electrode also exhibits excellent durability (about 150 mA h g⁻¹ at 5 A g⁻¹ after 3000 cycles). More impressively, even after standing for three days in the solution of 3 M ZnSO₄ electrolyte, the K_0.5V₂O₅ electrode still maintains a high capacity of 92.2 mA h g⁻¹ after 150 cycles, demonstrating its outstanding stability and tolerance in such aqueous electrolyte.

中文翻译：

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稳定V2O5基锌离子电池阴极的K离子锚固效应

水性锌离子电池（ZIB）由于其在安全性和环境友好性方面的优势而受到广泛关注。然而，对于这种系统而言，获得具有稳定电化学性能的阴极材料仍然是一个持续的挑战。在此，已经设计并通过将K ⁺插入V ₂ O _5中来合成K _0.5 V ₂ O ₅阴极，从而通过在V ₂ O ₅层之间形成化学键来构造稳定的晶体结构。K ⁺的成功插入已通过一系列实验测试和Vienna Ab-initio Simulation Package仿真得到了证实。这些相互连接的化学键起着“支柱”的作用，将V ₂ O ₅层牢固地保持在一起，并防止其溶解。此外，K _0.5 V ₂ O ₅电极还表现出优异的耐久性（3000次循环后在5 A g ^-1下约为150 mA h g ^-1）。更令人印象深刻的是，即使在3 M ZnSO ₄电解质溶液中放置三天后，K _0.5 V ₂ O ₅电极仍保持92.2 mA h g ^-1的高容量 在150次循环之后，证明了其在这种水性电解质中的出色的稳定性和耐受性。