UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2026-06-11 23:58
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Conference: Bucharest University Faculty of Physics 2026 Meeting


Section: Physics and Technology of Renewable and Alternative Energy Sources


Title:
Deep Eutectic Solvents: A New Frontier in Electrochemical Energy Storage


Authors:
Sermon CAISAR (1), Tom IACOB (2), Bogdan MITREA (2), Cornelia DIAC (2), Cornelia NICHITA (2,3), Adriana BĂLAN (1,2), Ioan STAMATIN (2)


*
Affiliation:
1) University of Bucharest, Faculty of Physics, ICUB, CTT 3Nano-SAE Research Center, MG-38, 405 Atomistilor Street, 077125, Magurele, Romania

2) University of Bucharest, Faculty of Physics, Magurele, PO Box MG 38, 077125 Romania

3) National Institute for Chemical – Pharmaceutical Research and Development, 112 Vitan Avenue, 031299, Bucharest, Romania


E-mail
sermon.caisar@s.unibuc.ro


Keywords:
deep eutectic solvents, electrolytes, green solvents, energy storage


Abstract:
Electrolytes are essential for defining ionic conductivity, safety, and long-term performance in contemporary battery systems. Conventional organic electrolytes frequently have toxicity, flammability, and environmental issues. Because DES-based electrolytes can deliver high ionic conductivity while greatly lowering safety hazards, they present an appealing option. For particular battery applications, such as Li-ion, Na-ion, Zn-ion, S-ion and redox flow batteries, their adjustable composition enables to maximize viscosity, ion transport, thermal stability, and electrochemical windows. The main disadvantages of these include ion membrane exchange and environmental concerns. DESs are being investigated as advanced electrolytes capable of improving safety and enhancing the stability of Li-ion, Na-ion, Zn-ion, S-ion and metal-based batteries. Deep eutectic solvents (DESs) have emerged as a versatile class of green solvents formed by combining hydrogen bond donors and acceptors to create eutectic mixtures with melting points significantly lower than those of their individual components. Their low cost, ease of preparation, tunable physicochemical properties, and environmental compatibility have made them attractive alternatives to conventional ionic liquids in applications ranging from electrochemistry to energy storage and separation processes. Among their key characteristics, electrical conductivity plays a critical role in determining their suitability for electrochemical systems such as batteries, supercapacitors, and electrodeposition processes. In this context, some bio-based solvents, such as ionic liquids (ILs), terpenes, and deep eutectic solvents (DESs), offer greener alternatives, enabling the redesign of electrolytes and potentially improving ion-exchange and membrane performance. Furthermore, all electrical properties are highly sensitive to temperature; increasing thermal energy generally enhances conductivity and dielectric loss by reducing the cohesive energy of the H-bond network and lowering viscosity. This study focuses on the synthesis of ChCl/urea, p-TsA/glycerol, and 4-HBSA/ethylene glycol deep eutectic solvents in different concentrations and investigates their electrical properties.