Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 525-537 |
| Seitenumfang | 13 |
| Fachzeitschrift | Zeitschrift fur Physikalische Chemie |
| Jahrgang | 226 |
| Ausgabenummer | 5-6 |
| Publikationsstatus | Veröffentlicht - Juni 2012 |
Abstract
Lithium-ion dynamics in the garnet-type solid electrolyte "Li 7La3Zr2O12" (LLZ) crystallizing with cubic symmetry was probed by means of variable-temperature 7Li 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)×1013 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.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Physikalische und Theoretische Chemie
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in: Zeitschrift fur Physikalische Chemie, Jahrgang 226, Nr. 5-6, 06.2012, S. 525-537.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Li ion dynamics in al-doped garnet-type Li7La3Zr 2O12 crystallizing with cubic symmetry
AU - Kuhn, Alexander
AU - Choi, Joon Yong
AU - Robben, Lars
AU - Tietz, Frank
AU - Wilkening, Martin
AU - Heitjans, Paul
N1 - Funding Information: 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 “Kompeten-zverbund Nord” and by the Deutsche Forschungsgemeinschaft (DFG) via the Research Unit 1277 (molife) is gratefully acknowledged. A. K. acknowledges support by the Stu-dienstiftung des deutschen Volkes e.V.
PY - 2012/6
Y1 - 2012/6
N2 - Lithium-ion dynamics in the garnet-type solid electrolyte "Li 7La3Zr2O12" (LLZ) crystallizing with cubic symmetry was probed by means of variable-temperature 7Li 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)×1013 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.
AB - Lithium-ion dynamics in the garnet-type solid electrolyte "Li 7La3Zr2O12" (LLZ) crystallizing with cubic symmetry was probed by means of variable-temperature 7Li 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)×1013 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.
KW - Garnets
KW - Lithium ion dynamics
KW - NMR
KW - Solid electrolytes
KW - Spin-lattice relaxation
UR - http://www.scopus.com/inward/record.url?scp=84862862120&partnerID=8YFLogxK
U2 - 10.1524/zpch.2012.0250
DO - 10.1524/zpch.2012.0250
M3 - Article
AN - SCOPUS:84862862120
VL - 226
SP - 525
EP - 537
JO - Zeitschrift fur Physikalische Chemie
JF - Zeitschrift fur Physikalische Chemie
SN - 0942-9352
IS - 5-6
ER -