Xiao, Bo-Hao; Zeng, Yinxiang; Xiao, Kang; Peng, Xinwen; Cao, Shunsheng; Howard, Christopher A; Liu, Zhao-Qing; (2025) Amide Molecules Induced Desolvated Zinc Ion Enables Stable Aqueous Batteries. Advanced Functional Materials , Article e10536. 10.1002/adfm.202510536. (In press).

Text Howard_Amide Molecules Induced Desolvated Zinc Ion Enables Stable Aqueous Batteries_AAM.pdf Access restricted to UCL open access staff until 2 October 2026. Download (14MB)

Abstract

Zinc-ion batteries (ZIBs), characterized by high theoretical capacity, cost-effectiveness, and environmental friendliness, hold promising prospects in large-scale energy storage. However, the slow desolvation process of hydrated Zn2+ leads to unstable Zn2+ ion flow and further hinders uniform Zn deposition. Moreover, the release of active H2O during the desolvation process will exacerbate the hydrogen evolution reaction. Herein, a zincophilic and electrophilic amide is introduced as a stabilizer to Zn2+ flow by optimizing the desolvation process of hydrated Zn2+. The amide molecules enter the solvation structure of Zn2+ through acyl coordination sites, reducing the desolvation energy barrier, hence facilitating uniform Zn deposition. Moreover, electrophilic amino groups effectively suppress hydrogen evolution by capturing active H2O. As a result, a symmetric cell with thioacetamide additive exhibits a remarkable lifespan of 2000 h at 1 mA/1 mAh cm−2. Even with an increased current density of 5 mA cm−2, the cell maintains stable cycling for 1000 h. This study offers a novel perspective on the crucial factors contributing to the irreversible growth of Zn dendrites in ZIBs, providing valuable insights for the development of electrolyte additives.

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