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Ion dynamics in hexagonal boron nitride ionogel electrolytes
Giselle de Araujo Lima E Souza1, Moises Acero1, Emilia Pelegano-Titmuss1
1Department of Physics, Hunter College, CUNY, New York, New York 10065, USA.
Hexagonal boron nitride (hBN) ionogels show promise for energy storage. Advanced nuclear magnetic resonance (NMR) reveals how hBN influences ion movement and interactions, crucial for electrolyte design.
Area of Science:
- Materials Science
- Electrochemistry
- Physical Chemistry
Background:
- Ionogel electrolytes with hexagonal boron nitride (hBN) nanoplatelets are advanced materials for energy storage.
- Understanding ion transport at the molecular level in these hBN-ionogels is limited.
Purpose of the Study:
- To investigate the molecular dynamics of ionic species in hBN-ionogels using advanced nuclear magnetic resonance (NMR) techniques.
- To elucidate the role of hBN and lithium salts in modulating ion transport and relaxation mechanisms.
Main Methods:
- Utilized diffusion and relaxation nuclear magnetic resonance (NMR) techniques.
- Employed fast-field cycling (FFC) NMR across a broad frequency range (30 kHz to 500-800 MHz).
- Investigated proton (1H), fluorine-19 (19F), and lithium-7 (7Li) relaxation profiles and diffusion.
Main Results:
- hBN significantly influences molecular rotation and translation, affecting 1H and 19F relaxation.
- Lithium ions (Li+) enhance anion mobility at the hBN interface.
- 7Li relaxation detected strong hBN surface interactions missed by diffusion NMR.
Conclusions:
- A broad frequency range in NMR is essential for studying ionogels.
- hBN plays a critical role in ion dynamics and interfacial behavior.
- Findings provide insights for designing optimized hBN-ionogel electrolytes for energy storage.
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