Fast‐Charging and Ultrahigh‐Capacity Zinc Metal Anode for High‐Performance Aqueous Zinc‐Ion Batteries,Advanced Functional Materials

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Fast‐Charging and Ultrahigh‐Capacity Zinc Metal Anode for High‐Performance Aqueous Zinc‐Ion Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-03-11 , DOI: 10.1002/adfm.202100398
Penghui Cao ₁ , Xiangyang Zhou ₁ , Anran Wei ₂ , Qi Meng ₁ , Han Ye ₃ , Weiping Liu ₄ , Jingjing Tang ₁ , Juan Yang ₁

Affiliation

Although some strategies have been triggered to address the intrinsic drawbacks of zinc (Zn) anodes in aqueous Zn‐ion batteries (ZIBs), the larger issue of Zn anodes unable to cycle at a high current density with large areal capacity is neglected. Herein, the zinc phosphorus solid solution alloy (ZnP) coated on Zn foil (Zn@ZnP) prepared via a high‐efficiency electrodeposition method as a novel strategy is proposed. The phosphorus (P) atoms in the coating layer are beneficial to fast ion transfer and reducing the electrochemical activation energy during Zn stripping/plating processes. Besides, a lower energy barrier of Zn²⁺ transferring into the coating can be attained due to the additional P. The results show that the as‐prepared Zn@ZnP anode in the symmetric cell can be cycled at a current density of 15 mA cm⁻² with an areal capacity of 48 mAh cm⁻² (depth of discharge, DOD ≈ 82%) and even at an ultrahigh current density of 20 mA cm⁻² and DOD ≈ 51%. Importantly, a discharge capacity of 154.4 mAh g⁻¹ in the Zn/MnO₂ full cell can be attained after 1000 cycles at 1 A g⁻¹. The remarkable effect achieved by the developed strategy confirms its prospect in the large‐scale application of ZIBs for high‐power devices.

中文翻译：

用于高性能水性锌离子电池的快速充电和超高容量锌金属阳极

尽管已经提出了一些策略来解决水性Zn离子电池（ZIBs）中锌（Zn）阳极的固有缺点，但忽略了无法在高电流密度下以大面积容量循环的较大的Zn阳极问题。本文提出了一种通过高效电沉积方法制备的包覆在锌箔（Zn @ ZnP）上的锌磷固溶合金（ZnP）的新策略。涂层中的磷（P）原子有利于快速离子转移并减少Zn汽提/电镀过程中的电化学活化能。此外，由于添加了P ，可以获得较低的Zn ²⁺转移到涂层中的能垒。结果表明，对称电池中制备的Zn @ ZnP阳极可以在15 mA cm的电流密度下循环^－2的面积容量为48 mAh cm ^－2（放电深度，DOD≈82％），甚至在20 mA cm ^－2的超高电流密度和DOD≈51％的情况下。重要的是，在1A g ^-1下经过1000次循环后，可以在Zn / MnO ₂充满电池中获得154.4 mAh g ^-1的放电容量。所开发策略所取得的显着效果证实了其在大功率设备ZIB的大规模应用中的前景。

更新日期：2021-05-17

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