Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: SYLI: Symposium Interfacial Challenges in Solid-State Li Ion Batteries - NMR studies

MM 26.3: Vortrag

Dienstag, 21. März 2017, 10:45–11:00, IFW A

7Li NMR studies of lithium ion dynamics in 70Li2S-30P2S5 materials — •Michael Haaks1, Steve Martin2, and Michael Vogel11Institut für Festkörperphysik, TU Darmstadt, Germany — 2Department of Materials Science and Engineering, Iowa State University, Ames, USA

Rising energy demand makes it important to improve the performance of lithium ion batteries. For this purpose it is important to understand the dynamics of lithium ions, in particular, in heterogeneous materials, which are used in modern strategies for material optimization. With combination of 7Li NMR spin-lattice relaxation, diffusion measurements, line-shape, and stimulated-echo analyses it is possible to investigate lithium ionic motion in wide range of time and length scales in 0.5Li2S-0.5(xGeS2-(1-x)GeO2)[1] and 70Li2S-30P2S5 glasses[2]. We exploit there capabilities to ascertain the effect of ceramization in 70Li2S-30P2S5. We find that the large variety of lithium environments results in broad distributions of correlation times for the jump motion of the lithium ions. Our results for 70Li2S-30P2S5 allow us to relate the enhancement of electronic conductivity under ceramization[3] to faster lithium ion dynamics on various length scales.

[1] Gabriel et al., Solid State Nuclear Magnetic Resonance 70, 53 (2015)

[2] Haaks et al., work in progress

[3] Mizuno et al., Advanced Materials 17, 918 (2005)

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