Ammonium vanadate has been considered as a competitive high-performance cathode material for aqueous Zn-ion batteries. However, it still suffers from insufficient rate capability and poor cyclability due to the low electronic conductivity. Herein, (NH₄)₂V₆O₁₆•0.9H₂O nanobelts with reduced graphene oxide (RGO) modification are synthesized by one-step hydrothermal reaction. Benefiting from the addition of RGO, an excellent electrochemical performance of (NH₄)₂V₆O₁₆•0.9H₂O@RGO nanobelts can be obtained. The (NH₄)₂V₆O₁₆•0.9H₂O@RGO displays a high-rate capacity and a high energy density of 386 Wh/kg at 72 W/kg. In particular, after 1000 cycles at 5 A/g, the capacity remains at 322 mAh/g with 92.8% capacity retention. In addition, the key reaction mechanisms of reversible Zn²⁺ insertion/extraction in (NH₄)₂V₆O₁₆•0.9H₂O@RGO are clarified.

钒酸铵已被认为是用于水性Zn离子电池的竞争性高性能阴极材料。然而，由于低的电子电导率，它仍然遭受速率能力不足和可循环性差的困扰。在此，通过一步水热反应合成了具有还原的氧化石墨烯（RGO）修饰的（NH ₄）₂ V ₆ O ₁₆ •0.9H ₂ O纳米带。得益于RGO的加入，可获得优异的（NH ₄）₂ V ₆ O ₁₆ •0.9H ₂ O @ RGO纳米带电化学性能。（NH ₄）₂ V ₆O ₁₆ •0.9H ₂ O @ RGO在72 W / kg下显示出高倍率容量和386 Wh / kg的高能量密度。特别是，在5 A / g的条件下进行1000次循环后，容量保持在322 mAh / g，容量保持率为92.8％。此外，阐明了在（NH ₄）₂ V ₆ O ₁₆ •0.9H ₂ O @ RGO中可逆Zn ²⁺插入/萃取的关键反应机理。