Issue 61, 2022

An amphoteric betaine electrolyte additive enabling a stable Zn metal anode for aqueous batteries

Abstract

The corrosion and dendritic growth of the Zn anode limit its electrochemical performance in aqueous Zn batteries. Here, we present an amphoteric betaine additive for 5 m ZnCl2 aqueous electrolyte. The carboxyl group on betaine forms hydrogen bonds with water and reduces the water activity. The molecule also experiences preferential adsorption on the Zn surface and separates the interactions between Zn and water. Side reactions at the Zn electrode are thus inhibited. The regulated interface also ensures uniform Zn deposition. As a result, the electrolyte with betaine additive allows reversible Zn plating/stripping for over 1400 h at 0.5 mA cm−2. A capacity retention of 94% is obtained after 3000 cycles for a VO2 cathode.

Graphical abstract: An amphoteric betaine electrolyte additive enabling a stable Zn metal anode for aqueous batteries

Supplementary files

Article information

Article type
Communication
Submitted
05 May 2022
Accepted
28 Jun 2022
First published
08 Jul 2022

Chem. Commun., 2022,58, 8504-8507

An amphoteric betaine electrolyte additive enabling a stable Zn metal anode for aqueous batteries

Z. Jia, W. Zhao, S. Hu, X. Yang, T. He and X. Sun, Chem. Commun., 2022, 58, 8504 DOI: 10.1039/D2CC02553A

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