Aqueous rechargeable Zn-ion batteries (ARZIBs) have been attracting huge attention recently, where V-based materials with host layer structures and fast channels enable the efficient diffusion of metal ions, leading to excellent properties of Zn²⁺ storage. Several ammonium vanadates have been explored as potential cathodes, and their performance in ARZIBs varies considerably. Herein, we choose H₂O-intercalated NH₄V₃O₈ (NH₄V₃O₈·0.5H₂O) nanobelts, which are synthesized by a low-temperature hydrothermal process, and reveal that the electrochemical performance of NH₄V₃O₈ is strongly enhanced by the H₂O molecules intercalated in the layer structure. Indeed, the NH₄V₃O₈·0.5H₂O nanobelts exhibit a super-high capacity of 423 mA h g⁻¹ at 0.1 A g⁻¹, together with long-term stability (50.1% retention after 1000 cycles) at 1 A g⁻¹. The Zn//NH₄V₃O₈·0.5H₂O battery thus assembled delivers a high energy density of 353 W h kg⁻¹ at a power density of 114 W kg⁻¹, comparing favorably with most of the state-of-the-art V-based cathode materials reported for ARZIBs. As a promising cathode candidate for aqueous batteries, the reversible (de)intercalation of Zn²⁺ in the H₂O-intercalated NH₄V₃O₈·0.5H₂O gives rise to the formation of Zn₃(OH)₂V₂O₇·2H₂O, which helps retain the desired long-term stability.

中文翻译：

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插层水分子NH4V3O8·0.5H2O纳米带作为高性能锌离子电池正极

水性可再充电锌离子电池（ARZIB）最近引起了巨大的关注，具有主体层结构和快速通道的基于V的材料可实现金属离子的有效扩散，从而导致Zn ²⁺储存的出色性能。已经研究了几种钒酸铵作为潜在的阴极，它们在ARZIBs中的性能差异很大。在本文中，我们选择了通过低温水热法合成的H ₂ O插入的NH ₄ V ₃ O ₈（NH ₄ V ₃ O ₈ ·0.5H ₂ O）纳米带，并揭示了NH ₄的电化学性能。V ₃通过插入层结构中的H ₂ O分子可大大增强O ₈。实际上，NH ₄ V ₃ O ₈ ·0.5H ₂ O纳米带在0.1 A g ^-1时表现出423 mA hg ^-1的超高容量，并在¹时具有长期稳定性（1000次循环后保留50.1％）。 A g ^-1。如此组装的Zn // NH ₄ V ₃ O ₈ ·0.5H ₂ O电池以114 W kg ^-1的功率密度提供353 W h kg ^-1的高能量密度。与报告用于ARZIB的大多数最新的基于V的阴极材料相比，具有优势。作为水电池的理想阴极候选材料，Zn ²⁺在H ₂ O嵌入的NH ₄ V ₃ O ₈ ·0.5H ₂ O中的可逆（去）嵌入导致形成Zn ₃（OH）₂ V ₂ O ₇ ·2H ₂ O，有助于保持所需的长期稳定性。