A Binary Hydrate-Melt Electrolyte with Acetate-Oriented Cross-Linking Solvation Shells for Stable Zinc Anodes
© 2022 Wiley-VCH GmbH.
| Veröffentlicht in: | Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 18 vom: 30. Mai, Seite e2201744 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2022
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| Zugriff auf das übergeordnete Werk: | Advanced materials (Deerfield Beach, Fla.) |
| Schlagworte: | Journal Article Zn anodes cross-linking hydrate-melt electrolyte solvation structures water activity |
| Zusammenfassung: | © 2022 Wiley-VCH GmbH. Aqueous zinc-ion batteries (ZIBs) with low cost and high safety are promising energy-storage devices. However, ZIBs with metal Zn anodes usually suffer from low coulombic efficiency and poor cycling performance due to the occurrence of side reactions on the Zn anodes. Here, a binary hydrate-melt ZnCl2 /Zn(OAc)2 electrolyte is designed to suppress the hydrogen evolution reaction and by-product formation on Zn anodes by adjusting the Zn2+ solvation structure. In the solvation structure of the hydrate-melt ZnCl2 /Zn(OAc)2 electrolyte, the carboxylate group in OAc- will coordinate with the Zn2+ , which will weaken the interaction between Zn2+ and H2 O molecules to achieve higher ionization energy of H2 O molecules. Simultaneously, these carboxylate groups of OAc- can serve as H-bond acceptors to construct H-bonds with H2 O molecules in their neighboring solvation structures, forming a cross-linking H-bond network. Such a cross-linking H-bond network further suppresses the water activity in ZnCl2 /Zn(OAc)2 electrolyte. As a result, in such an electrolyte, the side reactions are effectively restricted on Zn anodes and thus Zn anodes can achieve a high coulombic efficiency of 99.59% even after cycling. To illustrate the feasibility of the ZnCl2 /Zn(OAc)2 electrolyte in aqueous ZIBs, Zn||p-chloranil cells are assembled based on the ZnCl2 /Zn(OAc)2 electrolyte. The resultant Zn||p-chloranil cells exhibit enhanced cycling performance compared with the cases with a conventional ZnSO4 electrolyte |
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| Beschreibung: | Date Revised 06.05.2022 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202201744 |