溶剂化
电解质
阳极
水溶液
材料科学
过电位
无机化学
分子
离子
配合物的稳定常数
电化学
化学工程
化学
物理化学
有机化学
工程类
电极
作者
Rongwei Meng,Huan Li,Ziyang Lu,Chen Zhang,Zhenxing Wang,Yingxin Liu,Weichao Wang,Guowei Ling,Feiyu Kang,Quan‐Hong Yang
标识
DOI:10.1002/adma.202200677
摘要
Changing the solvation sheath of hydrated Zn ions is an effective strategy to stabilize Zn anodes to obtain a practical aqueous Zn-ion battery. However, key points related to the rational design remain unclear including how the properties of the solvent molecules intrinsically regulate the solvated structure of the Zn ions. This study proposes the use of a stability constant (K), namely, the equilibrium constant of the complexation reaction, as a universal standard to make an accurate selection of ligands in the electrolyte to improve the anode stability. It is found that K greatly impacts the corrosion current density and nucleation overpotential. Following this, ethylene diamine tetraacetic acid with a superhigh K effectively suppresses Zn corrosion and induces uniform Zn-ion deposition. As a result, the anode has an excellent stability of over 3000 h. This work presents a general principle to stabilize anodes by regulating the solvation chemistry, guiding the development of novel electrolytes for sustainable aqueous batteries.
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