Solid Electrolytes: Extremely Fast Charge Carriers in Garnet-Type Li6La3ZrTaO12 Single Crystals

Bernhard Stanje*, Daniel Rettenwander, Stefan Breuer, Marlena Uitz, Stefan Berendts, Martin Lerch, Reinhard Uecker, Günther J. Redhammer, Ilie Hanzu, Martin Wilkening*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The development of all-solid-state electrochemical energy storage systems,such as lithium-ion batteries with solid electrolytes, requires stable,electronically insulating compounds with exceptionally high ionicconductivities. Considering ceramic oxides, garnet-type Li7La3Zr2O12andderivatives, see Zr-exchanged Li6La3ZrTaO12(LLZTO), have attracted greatattention due to its high Li+ionic conductivity of 10−3Scm−1at ambienttemperature. Despite numerous studies focussing on conductivities ofpowder samples, only few use time-domain NMR methods to probe Li iondiffusion parameters in single crystals. Here we report ontemperature-variable NMR relaxometry measurements using both laboratoryand spin-lock techniques to probe Li jump rates covering a dynamic timewindow spanning several decades. Both techniques revealed a consistentpicture of correlated Li ion jump diffusion in the single crystal; the dataperfectly mirror a modified BPP-type relaxation response being based on aLorentzian-shaped relaxation function. The rates measured could beparameterized with a single set of diffusion parameters. Results from NMRare completely in line with ion transport parameters derived from conductivityspectroscopy.
Original languageEnglish
Article number1700140
Number of pages9
JournalAnnalen der Physik
Issue number12
Publication statusPublished - Sept 2017


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