Vanadium pentoxide (V₂O₅) nanomaterials have been extensively investigated as promising electrode materials for rechargeable batteries due to its high theoretical specific capacity. Herein, we report the preparation of layered  (NH₄)₂V₆O₁₆·H₂O nanosheets by intercalation of commercial V₂O₅ nanoparticles with ammonium ions and water molecules in aqueous solution at room temperature. The as-prepared (NH₄)₂V₆O₁₆·H₂O nanosheets have a size of 2—10 μm and thickness of 50—250 nm. Importantly, when used as an anode material for Li-ion batteries (LIBs), the (NH₄)₂V₆O₁₆·H₂O nanosheets exhibit much enhanced performances in comparison with commercial V₂O₅ nanoparticles, including large reversible discharge capacity (1148 mA·h/g at 0.1 A/g), excellent cycling performance (a high capacity of 1002 mA·h/g at 0.1 A/g after 70 cycles) and high rate capability (reversible capabilities of 1070 mA·h/g at 0.1 A/g). The results demonstrate that the (NH₄)₂V₆O₁₆·H₂O nanosheets can be used as an excellent anode material for LIBs, which may be also promising for other rechargeable batteries, such as Na-ion batteries and Zn-ion batteries.

室溫下, 在水溶液中將銨根離子和水分子插入到商用V₂O₅納米顆粒的層間, 制得了層狀的釩青銅[(NH₄)₂V₆O₁₆·H₂O]納米片. 該納米片的尺寸為2～10μm, 厚度為50～250 nm. 與商用V₂O₅納米顆粒相比, (NH₄)₂V₆O₁₆·H₂O納米片用作鋰離子電池(LIBs)的陽極材料時, 其性能得到較大提升, 包括大的可逆放電容量(0.1 A/g時為1148 mA·h/g)、出色的循環性能(循環70圈后在0.1 A/g時具有1002 mA·h/g的高容量)和高倍率性能(在0.1 A/g時具有1070 mA-h/g的可逆性能). 研究結果表明, (NH₄)₂V₆O₁₆·H₂O納米片可以作為鋰離子電池優良的陽極材料, 也有望應用于其它(如鈉離子電池和鋅離子電池等)可再充電電池.