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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Electrolytes for Zn Batteries: Deep Eutectic Solvents in Polymer Gels
Victor Gregorio1,2, Piotr Jankowski2,3, Nuria Garcia1
1Instituto de Ciencia y Tecnología de Polímeros Consejo Superior de Investigaciones Científicas (ICTP-CSIC), Calle Juan de la Cierva 3, 28006, Madrid, Spain.
Chemsuschem
|March 14, 2023
Summary
New gel polymer electrolytes using deep eutectic solvents and poly(ethylene oxide) show high ionic conductivity and reduced dendritic growth, offering promising advancements for battery technology.
Area of Science:
- Electrochemistry
- Materials Science
- Polymer Science
Background:
- Deep eutectic solvents (DES) offer unique properties for electrolytes.
- Poly(ethylene oxide) (PEO) is a common polymer used in solid-state electrolytes.
- Developing stable and conductive gel polymer electrolytes is crucial for advanced batteries.
Purpose of the Study:
- To prepare and characterize novel gel polymer electrolytes based on acetamide:Zn(TFSI)2 DES and PEO.
- To investigate the influence of PEO molecular weight and concentration on electrolyte properties.
- To evaluate the electrochemical performance, including ionic conductivity and dendritic growth suppression.
Main Methods:
- Solvent-free synthesis of gel polymer electrolytes.
- Physicochemical characterization (e.g., pseudo-solid behavior).
- Electrochemical impedance spectroscopy for ionic conductivity measurements.
- Dendrite growth studies in soft gels.
- Chemical structure analysis using spectroscopic techniques.
Main Results:
- Gel electrolytes with ultrahigh molecular-weight PEO exhibit pseudo-solid behavior and high ionic conductivity.
- Reduced dendritic growth was observed in gels with up to 1 wt% PEO.
- Strong interactions between PEO and Zn2+ ions were confirmed.
- Addition of PEO can lead to blend crystallization, but maintaining the eutectic point is possible by adjusting acetamide content.
Conclusions:
- Gel polymer electrolytes based on acetamide:Zn(TFSI)2 DES and PEO can be efficiently prepared.
- Ultrahigh molecular-weight PEO enhances ionic conductivity and suppresses dendrite formation.
- Careful control of composition is necessary to balance gel properties and maintain electrolyte stability.
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