Journal Article

PreJuSER-23008

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Li Ion Dynamics in Al-Doped Garnet-Type Li7La3Zr2O12 Crystallizing with Cubic Symmetry

Kuhn, A. ; Wilkening, M. ; Robben, L. ; Choi, J.-Y.FZJ* ; Tietz, F.FZJ* ; Heitjans, P.

2012
Oldenbourg München

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Please use a persistent id in citations: doi:10.1524/zpch.2012.0250

Abstract: Lithium-ion dynamics in the garnet-type solid electrolyte "Li7La3Zr2O12" (LLZ) crystallizing with cubic symmetry was probed by means of variable-temperature Li-7 NMR spectroscopy and ac impedance measurements. Li jump rates of an Al-containing sample follow Arrhenius behavior being characterized by a relatively high activation energy of 0.54(3) eV and a pre-exponential factor of 2.2(5) x 10(13) s(-1). The results resemble those which were quite recently obtained for an Al-free LLZ sample crystallizing, however, with tetragonal symmetry. Hence, most likely, the significantly higher Li conductivity previously reported for a cubic LLZ sample cannot be ascribed solely to the slight structural distortions accompanying the change of the crystal symmetry. Here, even Al impurities, acting as stabilizer for the cubic polymorph at room temperature, do not lead to the high ion conductivity reported previously.

Keyword(s): J ; Solid Electrolytes (auto) ; Garnets (auto) ; Lithium Ion Dynamics (auto) ; NMR (auto) ; Spin-Lattice Relaxation (auto)

Note: We thank Marc Krey for the ICP-OES analysis. Financial support by the Federal Ministry of Education and Science (BMBF) within the framework of the "Kompetenzverbund Nord" and by the Deutsche Forschungsgemeinschaft (DFG) via the Research Unit 1277 (molife) is gratefully acknowledged. A. K. acknowledges support by the Studienstiftung des deutschen Volkes e.V.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellverfahren (IEK-1)

Research Program(s):

1. Rationelle Energieumwandlung (P12)

Appears in the scientific report 2012

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Database coverage:
; Current Contents - Social and Behavioral Sciences ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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