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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 15: Materials for Energy Storage (joint session KFM/CPP)

KFM 15.7: Vortrag

Mittwoch, 7. September 2022, 11:45–12:05, H7

NMR studies of sintering effects on the lithium ion dynamics in Li1.5Al0.5Ti1.5(PO4)3 — •Philipp Seipel¹, Edda Winter¹, Michael Vogel¹, Tatiana Zinkevich², Sylvio Indris², Bambar Davassuren³, and Frank Tietz³ — ¹AG Vogel, Institute for Condensed Matter Physics, Technische Universität Darmstadt, Germany — ²Karlsruhe Institut of Technology, IAM-ESS, Karlsruhe, Germany — ³Forschungszentrum Jülich GmbH, IEK-1, Jülich, Germany

Various NMR methods are combined to study the structure and dynamics of Li1.5Al0.5Ti1.5(PO4)3 samples, which were obtained from sintering at various temperatures between 650 ^∘C and 900 ^∘C and show high bulk conductivities up to 5 mS/cm. We use ⁷Li NMR to study the transport mechanism in these glass ceramics [1]. Analysis of ⁷Li spin-lattice relaxation and line-shape changes indicates the existence of two species of lithium ions with clearly distinguishable jump dynamics, which can be attributed to crystalline and amorphous sample regions. An increase of the sintering temperature leads to higher fractions of the fast lithium species with respect to the slow one, but hardly affects the jump dynamics in either of the phases. ⁷Li field-gradient diffusometry reveals that the long-range ion migration is limited by the sample regions featuring slow transport. The high spatial resolution available from the high static field gradients of our setup allows us to observe also the lithium ion diffusion inside the small (< 100 nm) LATP crystallites, yielding a high self-diffusion coefficient of D=2 x 10^-12 m²/s at room temperature. [1]Winter et al., ZPCH, DOI:10.1515/zpch-2021-3109