Lu Qiongqiong, Liu Congcong, Du Yehong, Wang Xinyu, Ding Ling, Omar Ahmad, Mikhailova Daria
Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V., Helmholtzstraße 20, Dresden 01069, Germany.
Institute of Materials and Technology, Dalian Maritime University, Dalian 116026, China.
ACS Appl Mater Interfaces. 2021 Apr 14;13(14):16869-16875. doi: 10.1021/acsami.0c22911. Epub 2021 Mar 30.
Aqueous zinc-ion batteries (ZIBs) are considered as a promising energy storage system due to their low cost and high safety merits. However, they suffer from the challenge of uncontrollable dendrite growth due to a non-uniform zinc deposition, which increases internal resistance and causes battery failure. Herein, Ag coating fabricated by a facile surface chemistry route on zinc metal was developed to guide uniform zinc deposition. Ag-coated Zn shows improved electrolyte wettability, a small zinc deposition overpotential, and fast kinetics for zinc deposition/dissolution. Direct optical visualization and scanning electron microscopy images show uniform zinc deposition due to the introduction of Ag coating. As a result, the Ag-coated Zn anode can sustain up to 1450 h of repeated plating/stripping with a low overpotential in symmetric cells at a current density of 0.2 mA cm, while an improved performance is realized for full cells paired with a VO-based cathode. This work provides a facile and effective approach to improve the electrochemical performance of ZIBs.
水系锌离子电池（ZIBs）因其低成本和高安全性优点而被认为是一种很有前景的储能系统。然而，由于锌沉积不均匀，它们面临着枝晶生长不可控的挑战，这会增加内阻并导致电池失效。在此，通过一种简便的表面化学路线在锌金属上制备了银涂层，以引导锌均匀沉积。镀银锌表现出改善的电解质润湿性、较小的锌沉积过电位以及锌沉积/溶解的快速动力学。直接光学可视化和扫描电子显微镜图像显示，由于银涂层的引入，锌沉积均匀。结果，镀银锌阳极在对称电池中以0.2 mA cm的电流密度可在低过电位下持续进行高达1450小时的重复电镀/剥离，而与基于VO的阴极配对的全电池则实现了性能提升。这项工作提供了一种简便有效的方法来改善水系锌离子电池的电化学性能。
