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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Interfacial Layering and Screening Behavior of Glyme-Based Lithium Electrolytes
Maryam Nojabaee1, Hsiu-Wei Cheng2, Markus Valtiner2
1Max Planck Institute for Solid State Research , 70569 Stuttgart, Germany.
The Journal of Physical Chemistry Letters
|January 12, 2018
Summary
Electrical double layers in electrolytes are crucial for electrochemical devices. This study reveals complex salt association in triglyme electrolytes, impacting interfacial structure and screening length beyond Debye-Hückel theory.
Area of Science:
- Electrochemistry
- Materials Science
- Physical Chemistry
Background:
- Electrical double layers are fundamental to electrochemical devices, especially at high charge carrier concentrations.
- Understanding interfacial structures is key to optimizing device performance.
Purpose of the Study:
- To model the interfacial structure of triglyme electrolytes on muscovite mica.
- To investigate the effect of lithium triflate on this interfacial structure.
- To explore deviations from Debye-Hückel theory in concentrated electrolytes.
Main Methods:
- Surface force apparatus (SFA)
- Zeta potential measurements
- Infrared spectroscopy
Main Results:
- Pure triglyme forms a brush-like polymeric structure on mica.
- Lithium triflate presence suppresses this structure via anion adsorption, forming an extended double layer.
- Effective screening length exceeds Debye-Hückel predictions at >0.2 M lithium triflate, indicating significant salt complexation.
Conclusions:
- A novel model for triglyme electrolyte-mica interfaces is proposed.
- Complex salt association is a key feature in these concentrated electrolytes.
- Findings challenge existing theories and offer insights for electrochemical device design.
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