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Lean-water hydrogel electrolyte with improved ion conductivity for dendrite-free zinc-Ion batteries.
- Source :
-
Chemical Engineering Journal . Jun2024, Vol. 490, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- • A hydrogel electrolyte with lean-water matrix and hydrophilic interface is formed. • The hydrogel with ionic channels offers high ionic conductivity. • The hydrogel can suppress Zn dendrites and the side reactions on Zn anode. • The assembled cells delivers excellent cycle stability and high specific capacity. Although rechargeable aqueous zinc-ion batteries (ZIBs) are regarded as promising energy storage devices, the uncontrollable Zn dendrite and undesirable side reactions severely limit their practical applications. Herein, an anionic hydrogel electrolyte PAM/SA with 3D porous structures is developed by integrating sodium alginate (SA) and polyacrylamide (PAM) networks for highly reversible Zn plating/stripping. Mechanically enhanced and lean-water PAM/SA hydrogel with anionic chains for constructing ionic channels and molecular lubrication films, which facilitate Zn2+ migration for a high ionic conductivity (5.4 S m−1) and Zn2+ transference number (0.86) even under lean-water conditions (about 60%). Based on the experimental and theoretical analysis, the SA chain with strong coordination ability endows PAM/SA with improved desolvation kinetics and the ability to regulate the electric field intensity at the electrode/electrolyte interface, which is beneficial for suppressing side reactions and facilitating directional Zn deposition. Subsequently, the symmetric Zn//Zn cell based on PAM/SA hydrogel electrolyte delivers stable cycles for over 1800 h. The assembled Zn//V 2 O 5 battery based on PAM/SA reveals a high specific capacity and a long cycle life. This work provides a new insight for developing hydrogel electrolytes with high ionic conductivity and lean-water properties toward stable Zn anode [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 490
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 177419672
- Full Text :
- https://doi.org/10.1016/j.cej.2024.151524