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 26.1: Vortrag

Dienstag, 21. März 2017, 10:15–10:30, IFW A

Investigation of the Li ion conduction behavior in the solid electrolyte Li10GeP2S12 by multidimensional NMR — •Marc Paulus1, Magnus Graf1, Peter Notten1,4, Rüdiger-Albert Eichel1,3, and Josef Granwehr1,21FZ Jülich, Institut für Energie- und Klimaforschung , D-52425 Jülich, Germany — 2RWTH Aachen, ITMC, D-52074 Aachen, Germany — 3RWTH Aachen, IPC, D-52074 Aachen, Germany — 4Department of Chemical Engineering and Chemistry, TU/e, 5600 MB Eindhoven, The Netherlands

The biggest challenge to overcome in solid electrolytes is the relatively slow and still poorly understood lithium ion migration at solid electrolyte/electrode interfaces as well as at grain boundaries in solid-state electrolytes. Li10GeP2S12 is one of the best Li-ion conductors and therefore an interesting candidate as electrolyte material in Li-ion batteries. To link lithium migration mechanisms with different structural features of LGPS by correlation of spin lattice relaxation and spin alignment echo NMR a pulse sequence with two independently varied evolution times was developed. The obtained data was processed with an algorithm for discrete Laplace inversion. The resulting spin lattice-spin alignment correlation map of LGPS provided several signal components that were assigned to different morphologies and dynamic regions in LGPS. In addition, the experiment facilitated a direct distinction between relaxation-controlled and mobility-induced components in the τc distribution. Further analysis of the spectral NMR dimension in comparison with SEM and XRD measurements yielded a diverse model of lithium motion for the LGPS powder sample.

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