The intercalation and conversion compounds have long been exploited in aqueous zinc-ion batteries such as Prussian blue, VS₂, Zn_0.25V₂O₅, MnO₂ and so on. However, the lattice distortion of host materials during Zn ions insertion is the major issue with cycling stability. Metastable-phase vanadium oxide with bilayer structure, low crystallinity and interstitial water molecules may decrease lattice distortion, leading to long cycle stability. Herein we demonstrate H₁₁Al₂V₆O_23.2 (HAVO) microspheres with large interlayer distance (d₀₀₁ ​= ​1.336 ​nm) as cathode materials for zinc-ion batteries. The Zn ions insertion/extraction behaviors are investigated deeply. Ex-situ XRD and Raman spectra of HAVO collected at various states show no shift during battery operation, indicating the lattice distortion is nearly negligible. In addition, the lattice structure is well maintained even after 1000 cycles and the HAVO delivers an outstanding reversibility (88.6% capacity retention after 7000 cycles).

插层和转化化合物早已在含水的锌离子电池中使用，例如普鲁士蓝，VS ₂，Zn _0.25 V ₂ O ₅，MnO ₂等。但是，Zn离子插入过程中主体材料的晶格畸变是循环稳定性的主要问题。具有双层结构，低结晶度和间隙水分子的亚稳相氧化钒可以减少晶格畸变，从而导致长周期稳定性。在这里，我们展示了具有大的层间距离（d ₀₀₁）的H ₁₁ Al ₂ V ₆ O _23.2（HAVO）微球 = 1.336 nm）作为锌离子电池的正极材料。深入研究了Zn离子的插入/萃取行为。易地XRD和HAVO的拉曼光谱收集在各种状态显示电池操作期间不移位，表明晶格畸变是几乎可以忽略不计。此外，即使经过1000次循环，晶格结构仍可得到很好的维护，并且HAVO具有出色的可逆性（7000次循环后，容量保持率为88.6％）。