Aqueous zinc ion battery (AZIBs) has become a research hotspot because of its advantages of low cost, high safety and environmental protection. However, AZIBs still face challenges in achieving excellent rate performance, long service life, and wide temperature range due to slow Zn²⁺ diffusion kinetics. In this work, we developed a nonstoichiometric Na_0.3(NH₄)_0.6V₄O₁₀·0.4H₂O(NVO-Na) cathode material for AZIBs. The combined effects of pre-intercalated Na⁺ and structural water in NVO enhance the diffusion kinetic, reduce the electrostatic repulsion of Zn²⁺ (de)intercalation and keep the layer structure stable. The results show that NVO-Na cathode delivers an impressive specific capacity of 400.2 mAh g⁻¹ at a current density of 0.1 Ag ⁻¹ and an excellent capacity retention of 97.2 % after 2000 cycles at 10 A g⁻¹. In addition, the reversible intercalation mechanism of zinc ions in NVO-Na was investigated through ex-situ XRD and XPS analysis. The combined effect of pre-intercalated Na⁺, structural H₂O molecules and remaining NH₄⁺ keeps the layer structure stable during the reversible Zn²⁺ (de)intercalation reaction. This modification method provides a promising direction for the preparation of high-performance AZIBs cathode materials.

水系锌离子电池（AZIBs）以其低成本、高安全性和环保等优点成为研究热点。^{然而，由于 Zn 2+}扩散动力学缓慢，AZIBs 在实现优异的倍率性能、长使用寿命和宽温度范围方面仍然面临挑战。在这项工作中，我们开发了一种用于AZIBs的非化学计量Na _0.3 (NH ₄ ) _0.6 V ₄ O ₁₀ ·0.4H ₂ O(NVO-Na)正极材料。NVO中预插层Na ⁺和结构水的共同作用增强了扩散动力学，降低了Zn ^{2+的静电排斥力}（去）插层并保持层结构稳定。结果表明，NVO-Na 正极在 0.1 Ag ^{-1的电流密度下提供了令人印象深刻的 400.2 mAh g -1比容量，在 10 Ag -1}下循环 2000 次后容量保持率高达 97.2% 。此外，通过非原位XRD和XPS分析研究了锌离子在NVO-Na中的可逆嵌入机理。预嵌入的 Na ⁺、结构 H ₂ O 分子和剩余的 NH ₄ ⁺的联合作用使层结构在可逆 Zn ^{2+期间保持稳定}(de)嵌入反应。这种改性方法为制备高性能AZIBs正极材料提供了一个有前景的方向。