Institute of Nano-Science and Technology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China.
Institute of Nano-Science and Technology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China.
J Colloid Interface Sci. 2023 Aug 15;644:275-284. doi: 10.1016/j.jcis.2023.04.109. Epub 2023 Apr 25.
Aqueous rechargeable zinc-ion batteries (ARZIBs) are promising candidates for fast-charging energy-storage systems. The issues of stronger interactions between Zn and the cathode for ultrafast ARZIBs can be partially addressed by enhancing mass transfer and ion diffusion of the cathode. Herein, via thermal oxidation for the first time, N-doped VO porous nanoflowers with short ion diffusion paths and improved electrical conductivity were synthesized as ARZIBs cathode materials. The introduction of nitrogen derived from the vanadium-based-zeolite imidazolyl framework (V-ZIF) contributes to enhanced electrical conductivity and faster ion diffusion, while the thermal oxidation of the VS precursor assists the final product in exhibiting a more stable three-dimensional nanoflower structure. In particular, the N-doped VO cathode shows excellent cycle stability and superior rate capability with the delivered capacities of 165.02 mAh g and 85 mAh g, at 10 A g and 30 A g, and the capacity retention of 91.4% after 2200 cycles and 99% after 9000 cycles, respectively. Remarkably, the battery takes less than 10 s to be fully charged at 30 A g. Hence, this work provides a new avenue for designing unique nanostructured vanadium oxides and developing electrode materials suitable for ultrafast charging.
水相可充锌离子电池（ARZIBs）是快速充电储能系统的有前途的候选者。通过增强正极的质量传输和离子扩散，可以部分解决 Zn 与正极之间的强相互作用问题，从而实现超快 ARZIBs。在此，首次通过热氧化法合成了具有短离子扩散路径和改善的导电性的 N 掺杂 VO 多孔纳米花作为 ARZIBs 正极材料。来源于钒基沸石咪唑骨架（V-ZIF）的氮的引入有助于提高电导率和更快的离子扩散，而 VS 前体的热氧化有助于最终产物呈现出更稳定的三维纳米花结构。特别是，N 掺杂 VO 正极在 10 A g 和 30 A g 下的 165.02 mAh g 和 85 mAh g 的出色循环稳定性和卓越倍率性能，在 2200 次循环后容量保持率为 91.4%，在 9000 次循环后容量保持率为 99%。值得注意的是，该电池在 30 A g 下仅需不到 10 秒即可充满电。因此，这项工作为设计独特的纳米结构氧化钒和开发适合超快充电的电极材料提供了新途径。
