Reasonable nanostructure design and proper interface engineering are of great significance for improve the low conductivity and slow kinetic process of vanadium-based compounds. Herein, we report an advanced stainless steel (SS) supported oxygen-rich vacancy (NH₄)₂V₁₀O₂₅·8H₂O (O_d-NVO-SS-2) cistern-like nanobelt cathode with broadened interlayer spacings and ultrafast reaction kinetic. As expected, as cathode of aqueous zinc-ion battery (AZIB), the O_d-NVO-SS-2 electrode shows high capacity of 331.4 mAh g⁻¹ (0.3 A g⁻¹), excellent rate performance and satisfactory cyclic stability (78.3 mAh g⁻¹ at 4.8 A g⁻¹ after 7500 cycles). In addition, a flexible quasi-solid-state (FQSS) O_d-NVO-SS-2//Zn battery was studied, which showed almost the same excellent performance in various bending states, and even in a variety of harsh conditions water immersion, hammering, washing, loading, drilling and cutting, it can also perform well. In this work, the projected density of states (PDOS) calculation results shows that the defects improve the conductivity due to the increase of carrier concentration, which is beneficial to improve the reaction kinetics and endow the ability to store Zn²⁺ ions rapidly. The smaller Zn²⁺ ion adsorption energy of O_d-NVO-SS-2 calculated by density functional theory (DFT) also indicates that the introduction of defects is conducive to increasing the active sites of electrode materials and contributing additional capacity. In addition, that active material is directly grown on the current collector, thereby effectively avoiding shedding in the circulation process. Importantly, the Zn²⁺ storage mechanism in O_d-NVO-SS-2 is successfully revealed. This defect engineering has reference significance for the design of advanced electrode materials with excellent properties.

合理的纳米结构设计和适当的界面工程对于改善钒基化合物的低电导率和缓慢的动力学过程具有重要意义。在此，我们报道了一种先进的不锈钢 (SS) 支撑的富氧空位 (NH ₄ ) ₂ V ₁₀ O ₂₅ ·8H ₂ O (O _d -NVO-SS-2) 具有加宽层间距和超快的水槽状纳米带阴极反应动力学。正如预期的那样，作为水性锌离子电池（AZIB）的正极，O _d -NVO-SS-2 电极显示出 331.4 mAh g ^-1 (0.3 A g ^-1 ) 的高容量、优异的倍率性能和令人满意的循环稳定性（ 78.3毫安克^-1在 4.8 A g ^-1 7500 次循环后）。此外，研究了一种柔性准固态（FQSS）O _d -NVO-SS-2//Zn电池，其在各种弯曲状态下，甚至在各种恶劣条件下浸水都表现出几乎相同的优异性能、锤击、冲洗、装载、钻孔和切割，它也能表现出色。在这项工作中，投影态密度（PDOS）计算结果表明，由于载流子浓度的增加，缺陷提高了电导率，有利于改善反应动力学并赋予快速存储Zn ²⁺离子的能力。O _d较小的Zn ²⁺离子吸附能通过密度泛函理论（DFT）计算的-NVO-SS-2也表明缺陷的引入有利于增加电极材料的活性位点并贡献额外的容量。此外，该活性物质直接生长在集电器上，有效避免了循环过程中的脱落。重要的是，成功揭示了O _d -NVO-SS-2 中的Zn ²⁺存储机制。该缺陷工程对于设计性能优异的先进电极材料具有参考意义。