Aqueous zinc-ion batteries (ZIBs) are recognized as a highly competitive electrochemical energy storage systems due to the high safety and low cost, however, rational design of advanced cathodes with stable internal structures and fast Zn²⁺ diffusion channel remains challenging. Herein, we reported an advanced cathode of oxygen defect enriched (NH₄)₂V₁₀O₂₅·8H₂O (NVO_D) nanosheets with expanded tunnel structure, exceptional conductivity and superior structural stability for aqueous ZIBs, showing fast Zn²⁺ diffusion and excellent performance. The resulted ZIBs afford a remarkably high capacity (408 mAh g⁻¹ at 0.1 A g⁻¹), ultrahigh stability (94.1% retention over 4000 cycles), and exceptional energy density (287 Wh kg⁻¹), outperforming many cathodes of ZIBs. Furthermore, it is revealed that from theoretical and experimental studies the oxygen defects intrinsically contribute to the narrow bandgap and high electrical conductivity of NVO_D to greatly boost the performance. The reversible storage of Zn²⁺ in NVO_D is further illustrated via different in-situ characterization techniques. Moreover, the flexible soft-packaged batteries also demonstrate superior capacity retention of 91% after 200 cycles. Therefore, the exploration in NVO_D materials with rich oxygen defects will supply an attractive approach for designing high-performance and flexible ZIBs.

水性锌离子电池（ZIBs）由于具有较高的安全性和低成本而被公认为具有高度竞争力的电化学储能系统，然而，合理设计具有稳定内部结构和快速Zn ²⁺扩散通道的先进阴极仍然是一项挑战。本文中，我们报道了一种先进的富氧缺陷（NH ₄）₂ V ₁₀ O ₂₅ ·8H ₂ O（NVO _D）纳米片阴极，该纳米片具有扩展的隧道结构，出色的电导率和ZIBs水溶液的优异结构稳定性，显示出快速的Zn ²⁺扩散。和出色的性能。所得的ZIB提供了极高的容量（408  mAh  g在0.1 A g ^-1时为^-1），超高稳定性（在4000个循环中保留94.1％）和出色的能量密度（287 Wh kg ^-1），胜过许多ZIB的阴极。此外，从理论和实验研究表明，氧缺陷本质上有助于NVO _D的窄带隙和高电导率，从而大大提高了性能。通过不同的原位表征技术进一步说明了NVO _D中Zn ²⁺的可逆存储。此外，柔性软包装电池在200次循环后还显示出91％的出色容量保持率。因此，NVO _D的探索 具有丰富氧缺陷的材料将为设计高性能和灵活的ZIB提供有吸引力的方法。