Aqueous zinc ion batteries (AZIBs) have received extensive attention and study owing to environmental protection and intrinsic safety, in which ammonium vanadate (NHVO) with possessing stable bi-layered structure and high theoretical quality capacity is regarded as a potential cathode material. Nevertheless, the excessive ammonium ions located in the interlayer largely limit the Zn diffusion efficiency. Herein, acid treatment was employed to remove part of ammonium ions from the interlayer of NHVO to prepared NH-deficient ammonium vanadate (NVO2), which can enlarge the interlayer distance and enhance the Zn diffusion efficient. The experimental result demonstrates that the NVO2 electrode exhibits a high specific capacity of 472.5 mAh/g at 0.1 A/g and excellent rate performance of 195.5 mAh/g with current density increasing 100 times. Subsequently, some ex-situ characterization methods were utilized to analyze the Zn storage mechanism in NVO2. In addition, flexible NVO2/CNT membrane electrode was prepared by vacuum filtration and further assemble the quasi-solid-state flexible zinc ion batteries with employing polyacrylamide hydrogel, which exhibits a favorable electrochemical performance and mechanical stability as well, revealing its huge application prospect for flexible electronics.

中文翻译：

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准固态柔性锌离子电池酸处理预去除钒酸铵层间部分铵离子


水系锌离子电池（AZIBs）由于环保和本质安全而受到广泛的关注和研究，其中钒酸铵（NHVO）具有稳定的双层结构和较高的理论质量容量，被认为是一种潜在的正极材料。然而，位于层间的过量铵离子很大程度上限制了Zn的扩散效率。本文通过酸处理去除NHVO层间的部分铵离子，制备出缺NH的钒酸铵（NVO2），可以扩大层间距离并提高Zn扩散效率。实验结果表明，NVO2电极在0.1 A/g电流下表现出472.5 mAh/g的高比容量，电流密度增加100倍时表现出195.5 mAh/g的优异倍率性能。随后，利用一些异位表征方法分析了NVO2中的Zn储存机制。此外，通过真空过滤制备了柔性NVO2/CNT膜电极，并进一步采用聚丙烯酰胺水凝胶组装成准固态柔性锌离子电池，表现出良好的电化学性能和机械稳定性，展现了其巨大的应用前景。柔性电子产品。