Optimizing zinc flow battery performance with deep eutectic electrolytes and co-solvents

Name: Pongpon Pipattanachaiyanan

Organization : Chulalongkorn University. Faculty of Science

Name: Manaswee Suttipong

Organization : Chulalongkorn University. Faculty of Science

Email : manaswee.s@chula.ac.th

keyword: Deep eutectic solvents

LCSH: Zinc ion batteries

LCSH: Flow batteries

LCSH: Electrolytes

Abstract: Zinc flow batteries (ZFBs) are a promising solution for advanced energy storage, offering significant potential to improve efficiency through the optimization of key components, including electrodes, membranes, and electrolytes. A major challenge in ZFBs is the occurrence of hydrogen evolution reactions (HER), which lower efficiency, reduce the battery's lifespan, and create safety risks. This study investigates the use of deep eutectic electrolytes (DEE), specifically a 1:4 molar ratio of choline chloride (ChCl) and ethylene glycol (EG), to desolvate zinc chloride (ZnCl₂) and address these limitations. While DEE demonstrates potential, its high viscosity hinders overall performance. To mitigate this issue, co-solvents such as dimethyl sulfoxide (DMSO) and water were introduced to reduce viscosity. Both co-solvents influence ionic conductivity but in different ways. Molecular dynamics (MD) simulations revealed that water as a co-solvent provides the highest diffusion coefficient and ionic conductivity, surpassing both the pure DEE and DMSO systems due to the formation of solvent-separated ion pairs, which facilitate greater Zn²⁺ mobility. However, water also accelerates HER, compromising the stability and efficiency of the battery. In contrast, DMSO, though less effective at enhancing ionic conductivity, minimizes HER, offering a trade-off between improved transport properties and chemical stability. These findings emphasize the importance of co-solvent selection in designing electrolytes for zinc flow batteries, highlighting the balance between ionic conductivity and long-term stability required for next-generation energy storage systems

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2025

Modified: 2025-10-29

Issued: 2025-10-29

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BibliograpyCitation : In The Chemical Society of Thailand under the Patronage of Professor Dr. Her Royal Highness Princess Chulabhorn Krom Phra Srisavangavadhana and Suranaree University of Technology. Institute of Science. School of Chemistry. Pure and Applied Chemistry International Conference 2025 (PACCON 2025) (pp.727-732). Bangkok : The Chemical Society of Thailand under the Patronage of Professor Dr. Her Royal Highness Princess Chulabhorn Krom Phra Srisavangavadhana in association with the School of Chemistry, Institute of Science, Suranaree University of Technology, 2025

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