Recently, aqueous zinc ion batteries (AZIBs) have emerged as novel energy storage devices for their low cost, favorable safety and high theoretical capacity. However, layered ammonium vanadates, as promising cathode materials, suffer from slow Zn²⁺ diffusion kinetics due to the strong electrostatic interactions between Zn²⁺ and the [VO_n] layer, irreversible deammoniation and poor conductivity. In this work, Ag⁺ intercalated NH₄V₄O₁₀ (ANVO) was synthesized as a high-performance cathode for AZIBs. The pre-intercalated Ag⁺ interacts with the lattice oxygen to form strong Ag–O bonds, acting as “pillars” to stabilize the layered structure in electrochemical reactions. Moreover, the Ag⁰ generated in situ during the discharge process favors enhancement of the electronic conductivity of the material. The dual effects of Ag⁺ intercalation endow AVNO with high structural stability and fast electron/Zn²⁺ diffusion kinetics, leading to superior electrochemical performance. In particular, it exhibits an ultralong cycling life (with 95% capacity retention after 1000 cycles at 5 A g⁻¹) as well as competitive rate performance (473.6 mA h g⁻¹ at 0.2 A g⁻¹ and 286.6 mA h g⁻¹ at 10 A g⁻¹). This research provides valuable insights for designing high-capacity and long-life cathode materials.

中文翻译：

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Ag+ 嵌入的双重作用提高了NH4V4O10阴极的动力学和稳定性，从而增强了锌离子储存


近年来，水性锌离子电池 （AZIBs） 因其成本低、安全性好、理论容量高等优点而成为新型储能装置。然而，层状钒酸铵作为有前途的正极材料，由于 Zn²⁺ 和 [VO_n] 层之间的强静电相互作用、不可逆的脱氨作用和较差的导电性，Zn²⁺ 扩散动力学缓慢。在这项工作中，合成了 Ag⁺ 插层 NH₄V₄O₁₀ （ANVO） 作为 AZIBs 的高性能阴极。预插层的 Ag⁺ 与晶格氧相互作用，形成强 Ag-O 键，在电化学反应中充当稳定层状结构的“支柱”。此外，在放电过程中原位产生的 Ag⁰ 有利于增强材料的电子导电性。Ag⁺ 插层的双重效应赋予 AVNO 高结构稳定性和快速电子/Zn²⁺ 扩散动力学，从而获得卓越的电化学性能。特别是，它表现出超长的循环寿命（在 5 A ^g-1 下循环 1000 次后仍能保持 95% 的容量）以及有竞争力的倍率性能（0.2 A ^g-1 时为 473.6 mA h ^g-1,10 A ^g-1 时为 286.6 mA h ^g-1）。这项研究为设计高容量和长寿命的正极材料提供了有价值的见解。