Journal
ADVANCED MATERIALS
Volume 34, Issue 37, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202200677
Keywords
chelating ligands; corrosion; dendrite growth; solvation; Zn anodes
Categories
Funding
- National Natural Science Foundation of China [52172223, 51932005]
- Young Elite Scientists Sponsorship Program by Tianjin [TJSQNTJ-2020-11]
- Haihe Laboratory of Sustainable Chemical Transformations
- National Key Research and Development Program of China [2018YFE0124500]
- Fundamental Research Funds for the Central Universities
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Changing the solvation sheath is an effective strategy for stabilizing Zn-ion batteries, but key points related to the design remain unclear. This study proposes using stability constant as a universal standard to improve anode stability and achieves excellent stability of the Zn anode.
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.
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