Meng Rongwei, Li Huan, Lu Ziyang, Zhang Chen, Wang Zhenxing, Liu Yingxin, Wang Weichao, Ling Guowei, Kang Feiyu, Yang Quan-Hong
School of Marine Science and Technology, Tianjin University, Tianjin, 300072, China.
Nanoyang Group, Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou, 350207, China.
Adv Mater. 2022 Sep;34(37):e2200677. doi: 10.1002/adma.202200677. Epub 2022 Aug 11.
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.
改变水合锌离子的溶剂化鞘层是稳定锌阳极以获得实用水系锌离子电池的有效策略。然而，与合理设计相关的关键点仍不明确，包括溶剂分子的性质如何内在地调节锌离子的溶剂化结构。本研究提出使用稳定常数（K），即络合反应的平衡常数，作为通用标准，以便在电解质中准确选择配体来提高阳极稳定性。研究发现，K对腐蚀电流密度和成核过电位有很大影响。在此之后，具有超高K值的乙二胺四乙酸有效地抑制了锌的腐蚀并诱导了均匀的锌离子沉积。结果，阳极具有超过3000小时的优异稳定性。这项工作提出了通过调节溶剂化化学来稳定阳极的一般原则，为可持续水系电池新型电解质的开发提供了指导。
