Enabling uniform zinc deposition by zwitterion additives in aqueous zinc metal anodes

Sung Ho Huh, Yoon Jeong Choi, So Hee Kim, Jong Seong Bae, Si Hwan Lee, Seung Ho Yu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The rechargeable aqueous zinc metal battery is considered one of the most promising next-generation batteries for energy storage systems, owing to its low negative standard reduction potential (−0.76 vs. the standard hydrogen electrode (SHE)), low cost of zinc and water, and no fire-risk. However, the formation of zinc dendrites and hydrogen evolution hinder the commercialization of rechargeable aqueous zinc metal batteries. In this study, we investigate the use of 6-aminohexanoic acid (6-AA), a type of amino acid, as an electrolyte in a 1 M ZnSO4 solution. The 6-AA molecules become zwitterions, reducing side reactions by adsorbing onto the zinc metal surface and blocking water molecules and other ions, except for zinc ions. Additionally, the adsorbed 6-AA molecules hinder the two-dimensional diffusion of zinc ions on the zinc metal surface and thereby reduce the formation of zinc dendrites. The 6-AA additive enables reduced corrosion, and uniform zinc deposition is observed. Moreover, both the Zn‖Zn symmetric cell and Zn‖Cu cell with the 6-AA added electrolyte exhibit a long cycle life, and the α-MnO2‖Zn full cell shows improved cycle performance by using the 6-AA additive.

Original languageEnglish
Pages (from-to)19384-19395
Number of pages12
JournalJournal of Materials Chemistry A
Volume11
Issue number36
DOIs
Publication statusPublished - 2023 Aug 15

Bibliographical note

Publisher Copyright:
© 2023 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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