Vanadium-based oxides with high theoretical specific capacity and open crystal structure are promising cathodes for aqueous zinc ion batteries (ZIBs). However, the frustrating dissolution and structural collapse of vanadium-based oxides, especially when cycling at a low current density, lead to severe performance degradation. Here, we demonstrate doping of Fe opens up a rapid Zn²⁺ diffusion channel, and results in a stable layer-structured vanadium oxide nanobelt (FeVO) with an expanded interlayer spacing up to 10.8 Å. This enables a cathode with high structural stability, leading to an outstanding cyclic stability of 300 cycles at a low current density of 0.5 A g^-1 with a high retention of 94.6 %. Even cycling at 0.2 A g^-1, the FeVO still maintains a retention of 93.6 % after 150 cycles. A reversible co-intercalation mechanism of Zn²⁺ and H₂O is further revealed via ex-situ XRD and XPS techniques. Such boosted electrochemical performance is attributed to the large interlayer space providing ion diffusion path and a stable layered structure. These excellent characteristics of the prepared vanadium oxide cathode show great potential for high-performance aqueous zinc ion batteries.

具有高理论比容量和开放晶体结构的钒基氧化物是用于水性锌离子电池（ZIB）的有前途的正极。然而，钒基氧化物令人沮丧的溶解和结构崩溃，尤其是在低电流密度下循环时，会导致严重的性能下降。在这里，我们展示了 Fe 的掺杂打开了快速的 Zn ²⁺扩散通道，并产生了稳定的层状结构氧化钒纳米带 (FeVO)，层间距扩大到 10.8 Å。这使正极具有高结构稳定性，从而在 0.5 A g ^-1的低电流密度下实现 300 次循环的出色循环稳定性和 94.6% 的高保留率。甚至以 0.2 A g ^-1循环，FeVO 在 150 次循环后仍保持 93.6% 的保留率。锌的可逆共嵌入机构²⁺和H ₂ O通过进一步揭示前-原位X射线衍射和XPS技术。这种增强的电化学性能归因于提供离子扩散路径的大层间空间和稳定的层状结构。制备的钒氧化物正极的这些优异特性显示出高性能水系锌离子电池的巨大潜力。