Advanced Institute of Convergence Technology, Seoul National University, Suwon 16229, Republic of Korea.
School of Energy Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea.
Nanoscale. 2023 Feb 23;15(8):3737-3748. doi: 10.1039/d2nr06372g.
Although non-aqueous lithium-ion batteries have a high gravimetric density, aqueous zinc-ion batteries (ZIBs) have recently been in the spotlight as an alternative, because ZIBs have characteristics such as high volumetric density, high ionic conductivity, eco-friendliness, low cost, and high safety. However, the improvement in electrochemical performance is limited due to insufficient rate capability and severe cycle fading of the vanadium-oxide-based cathode and zinc-metal-based anode material, which are frequently used as active materials for ZIBs. In addition, complex methods are required to prepare high-performance cathode and anode materials. Therefore, a simple yet effective strategy is needed to obtain high-performance anodes and cathodes. Herein, an ammonium vanadate nanofiber (AVNF) intercalated with NH and HO as a cathode material for ZIBs was synthesized within 30 minutes through a facile sonochemical method. In addition, an effective AlO layer of 9.9 nm was coated on the surface of zinc foil through an atomic layer deposition technique. As a result, AVNF//60AlO@Zn batteries showed a high rate capability of 108 mA h g even at 20 A g, and exhibited ultra-high cycle stability with a capacity retention of 94% even after 5000 cycles at a current density of 10 A g.
虽然非水系锂离子电池具有高的重量密度，但水系锌离子电池（ZIBs）作为替代物最近受到了关注，因为 ZIBs 具有高体积密度、高离子导电性、环保、低成本和高安全性等特点。然而，由于钒氧化物基正极和锌金属基负极材料的倍率性能不足和严重的循环衰减，电化学性能的提高受到限制，这两种材料经常被用作 ZIBs 的活性材料。此外，制备高性能正极和负极材料需要复杂的方法。因此，需要一种简单而有效的策略来获得高性能的阳极和阴极。在此，通过简便的超声化学方法在 30 分钟内合成了一种作为 ZIBs 正极材料的插层有 NH 和 HO 的铵钒酸盐纳米纤维（AVNF）。此外，通过原子层沉积技术在锌箔表面涂覆了 9.9nm 的有效 AlO 层。结果，AVNF//60AlO@Zn 电池在 20A g 的电流密度下表现出 108 mA h g 的高倍率性能，并且在 10A g 的电流密度下循环 5000 次后容量保持率仍高达 94%，表现出超优的循环稳定性。
