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Optimizing Molecular Weight of Polyethylene Glycol as an Additive for Stabilizing Zn Metal Anode in Aqueous Electrolyte
Abstract
Polyethylene glycol (PEG) additives have attracted signifi cant attention as a cost-eff ective approach for modifying the deposition
behavior of Zinc (Zn) anodes. In this study, we investigated the eff ectiveness of PEG additives in 1 M ZnSO 4 aqueous
electrolytes, specifi cally examining the eff ect of PEG molecular weight on Zn deposition. By exploring the adsorption of
PEG polymers with diff erent molecular weights, we identifi ed the PEG with a molecular weight of 300 g mol −1 (PEG300)
as the most suitable polymer. In terms of electrochemical performance, Zn anodes exhibited steady cycling for 232 cycles
with high reversibility in 1 M ZnSO 4 electrolyte with 0.1 wt.% PEG300. By contrast, Zn anodes using the control electrolyte
of 1 M ZnSO 4 began to fail after only 70 cycles. These fi ndings highlight the potential of PEG300 as a simple and adaptable
additive for signifi cantly extending the longevity of Zn metal anodes.
