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Updated: Dec 12, 2025

Zinc-Sponge Battery Electrodes that Suppress Dendrites
Published on: September 29, 2020
Stabilized Rechargeable Aqueous Zinc Batteries Using Ethylene Glycol as Water Blocker
Nan Wang1, Yang Yang1, Xuan Qiu1
1Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai, 200433, P. R. China.
Abstract:
Addressing the cost concerns and safety of zinc metal has stimulated research on mild aqueous Zn-metal batteries. However, their application is limited by dendrite formation and H2 evolution on the Zn anode. Here, ethylene glycol (EG) is proposed as additional water blocker to form localized high-concentration electrolyte for aqueous Zn batteries. This unique solvation structure inhibits hydrate formation and facilitates close association of Zn2+ and SO4 2- , which alleviates undesired H2 evolution and enables dendrite-free Zn plating/stripping. Accordingly, a Zn//PQ-MCT (phenanthrenequinone macrocyclic trimer) full cell with such electrolyte exhibits a very long cycling life (more than 8000 cycles). Furthermore, this EG-based aqueous electrolyte is non-flammable and inexpensive and prevents evaporation of water when open to the atmosphere, endowing aqueous Zn batteries with excellent safety performance and easy operability in practical applications.
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