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MM: Fachverband Metall- und Materialphysik

MM 7: Battery Materials

MM 7.1: Vortrag

Montag, 12. März 2018, 11:45–12:00, H 0106

NMR studies on ion dynamics in solid electrolytes for Li-ion batteries — •Edda Klotz¹, Stefan Spannenberger², Michael Haaks¹, Bernhard Roling², and Michael Vogel¹ — ¹Condensed Matter Physics, TU Darmstadt, Germany — ²Department of Chemistry, University of Marburg, Germany

In order to improve safety, lifetime, and energy density in batteries, all-solid state ion batteries are of great significance in modern-day research. One of their key components are solid electrolytes with high ionic conductivities. In this area, various materials based on Li⁺-ions as well as Na⁺-ions have been investigated and found to have the potential to outperform the liquid electrolytes currently used in ion batteries.

The improvement of those materials depends directly on understanding the ion dynamics that determine the ion conductivity. By combining various NMR techniques such as spin-lattice relaxation, stimulated-echo and line-shape analysis, we are able to investigate local ion dynamics in a broad time range. Additionally, self-diffusion coefficients are determined using static field gradient NMR (SFG). We apply those methods to investigate the effects of ceramization in glassy Li-ion conductors [1]. We show that local dynamics and macroscopic diffusion can be consistently described by the same broad distributions of activation energies.

[1] Haaks et al., Phys. Rev. B 96, 104301 (2017)