Regensburg 2025 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 37: Brownian Motion and Anomalous Diffusion

DY 37.6: Talk

Thursday, March 20, 2025, 16:15–16:30, H43

Local and Diffusive Dynamics of Interlayer Lithium ions in Synthetic Fluoro-Hectorites: ²H and⁷Li NMR-Study — •Jepsinraj Kakkuzhiyulla Parambath and Michael Vogel — TU Darmstadt, Institut for Condensed Matter Physics, Hochschulstr. 6, 64289, Darmstadt, Germany

Investigating ion transport is a crucial part of developing robust devices for energy storage and sensors. Fluoro-Hectorite, a clay mineral of the Smectite group serves as a model material for this investigation, specifically Lithium Hectorite with the structural formula of Li_0.5[Mg_2.5Li_0.5]Si₄O₁₀F₂ and a layered structure. Due to the swelling properties of the Hectorites, the interlayer spacing and thus the degree of confinement can be varied with water content. The charge transports results from interlayer lithium ions, which are dissolved in water. The Hectorite confinements provide mechanical stability and guide the charge carriers over long distances, leading to fast ion transport [Hiebl et al., Chem. Mater. 2020, 32, 7445]. We use ²H and ⁷Li NMR to study the dynamics of the interlayer water molecules and lithium ions. Spin lattice relaxometry studies of local dynamics, including field cycling and static field gradient(SFG) measurements of diffusive dynamics show a strong dependence on the interlayer spacing.

Keywords: Clay minerals,Battery electroyte,Interface,NMR