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Updated: Dec 27, 2025
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Lithium-ion coordination-induced conformational change of PEG chains in ionic-liquid-based electrolytes
Yuji Kamiyama1, Masayuki Shibata1, Ryo Kanzaki2
1Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan. k-fujii@yamaguchi-u.ac.jp.
Physical Chemistry Chemical Physics : PCCP
|February 29, 2020
Summary
Poly(ethylene glycol) (PEG) forms stable complexes with lithium ions in ionic liquid electrolytes, causing PEG chains to fold. This structural change is crucial for understanding ion transport in advanced battery materials.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Ionic liquids (ILs) with lithium salts are promising electrolytes for high-performance batteries.
- Understanding polymer-ion interactions is key to optimizing electrolyte properties and battery safety.
Purpose of the Study:
- To elucidate the structural changes of poly(ethylene glycol) (PEG) in imidazolium-based ionic liquid electrolytes containing lithium bis(trifluoromethanesulfonyl)amide (LiTFSA).
- To investigate the complexation mechanism between Li+ ions and PEG in IL electrolytes.
Main Methods:
- Raman spectroscopy to analyze ion-desolvation and complex formation.
- High-energy X-ray total scattering (HEXTS) to determine radial distribution functions.
- Molecular dynamics (MD) simulations to complement experimental findings and model polymer structure.
Main Results:
- TFSA anions are desolvated from Li+ ions upon PEG addition, forming stable Li+-PEG complexes.
- A desolvation number of ~0.4 TFSA anions per PEG oxygen atom was quantified.
- Li+-PEG complexation induces a conformational change in PEG chains from gauche/anti to syn conformers.
- This conformational change leads to a decreased radius of gyration (Rg), indicating polymer chain folding.
Conclusions:
- The study reveals a detailed mechanism of Li+-PEG complexation in IL electrolytes.
- The observed polymer chain folding impacts ion transport properties and electrolyte performance.
- Findings provide insights for designing advanced electrolytes for lithium-ion batteries.
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