Herein, we report a hydrothermal process to prepare controllable morphology (NH₄)₂V₄O₉ nanosheets by adjusting the amount of acetic acid. Further, the structure and electrochemical property of the (NH₄)₂V₄O₉ nanosheets are systematically investigated. The electrochemical tests show that the performance of (NH₄)₂V₄O₉ nanostructures is greatly dependent on the morphology of (NH₄)₂V₄O₉ samples as cathode materials for aqueous rechargeable zinc-ion batteries. In particular, the (NH₄)₂V₄O₉ nanosheets own better electrochemical performance compared with nanoparticles, which exhibit high reversible capacity (358.0 mAh·g⁻¹ at 0.3 A·g⁻¹), excellent cycle performance (82.2% capacity retention after 5000 cycles at 10 A·g⁻¹) and as well as rate performance. The outstanding electrochemical performance of the as-prepared nanosheets can be assigned to well-regulated morphology. This work creates a new and efficient way to design cathodes for aqueous rechargeable zinc-ion batteries.

在此，我们报道了一种通过调节乙酸量来制备可控形态(NH ₄ ) ₂ V ₄ O _{9纳米片的水热工艺。}此外，系统地研究了(NH ₄ ) ₂ V ₄ O ₉纳米片的结构和电化学性能。电化学测试表明(NH ₄ ) ₂ V ₄ O ₉纳米结构的性能很大程度上取决于(NH ₄ ) ₂ V ₄ O _{9的形貌。}样品作为水系可充电锌离子电池的正极材料。特别是，与纳米粒子相比，(NH ₄ ) ₂ V ₄ O ₉纳米片具有更好的电化学性能，表现出高可逆容量（358.0 mAh·g ^-1 at 0.3 A·g ^-1），优异的循环性能（82.2%容量）在 10 A·g ^-1下 5000 次循环后的保持力以及倍率性能。所制备的纳米片的出色电化学性能可以归因于良好调节的形态。这项工作为设计用于水系可充电锌离子电池的阴极创造了一种新的有效方法。