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Engineering the interplanar spacing of ammonium vanadates as a high-performance aqueous zinc-ion battery cathode

Tang, Boya, Zhou, Jiang, Fang, Guozhao, Liu, Fei, Zhu, Chuyu, Wang, Chao, Pan, Anqiang, Liang, Shuquan
Journal of materials chemistry A 2019 v.7 no.3 pp. 940-945
ammonium compounds, batteries, cathodes, diffusivity, electrochemistry, energy, energy density
We report the engineering of the interplanar spacing of ammonium vanadates to achieve the optimal electrochemical performance as cathodes for aqueous zinc-ion batteries (ZIBs) and provide insights into the origin of the enhanced electrochemical behaviors. The NH₄V₄O₁₀ compound, with the largest interplanar spacing (9.8 Å) and high diffusion coefficient, exhibits high energy density (374.3 W h kg⁻¹) and power density (9000 W kg⁻¹) as well as superior long-term cycling performance (a discharge capacity of 255.5 mA h g⁻¹ can be maintained after 1000 cycles at 10 A g⁻¹). With the merits of impressive energy density and long cycle life, the NH₄V₄O₁₀ might be a new promising cathode for aqueous ZIBs for grid energy storage applications. This work provides a direction for choosing or designing the ideal high-performance cathode for aqueous ZIBs and other advanced battery systems.