Regensburg 2019 – wissenschaftliches Programm
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SYCO: Symposium Mechanically Controlled Electrical Conductivity of Oxides
SYCO 1: Mechanically controlled electrical conductivity of oxides
SYCO 1.2: Hauptvortrag
Montag, 1. April 2019, 10:00–10:30, H1
Strain effects in ionic conductivity and electrode processes — •Jürgen Janek1 and Carsten Korte2 — 1Institute of Physical Chemistry, Justus-Liebig University, Gießen, Germany — 2Institut für Energie- und Klimaforschung (IEK), FZ Jülich, Germany
Strain induced effects play an important role in solid state reactions and transport processes. Strain may be caused by external mechanical load or by chemical reactions in the solid state itself. In this presentation two examples for strain effects in the solid state will be highlighted: a) Strain created during growth of hetero-multilayers of ion-conducting solid electrolytes can cause conductivity changes relative to the unstrained bulk, but due to the complex microstructure of heterophase multilayers it is difficult to separate strain effects from the effect of dislocations, grain boundaries and interfaces [1]. b) Strain created by volume changes of intercalation compounds in composite cathodes of solid state batteries (chemo-mechanics) causes severe interface impedances that deteriorate the performance of solid state batteries [2].
[1] J. Keppner et al., Phys. Chem. Chem. Phys. 20 (2018) 9269
[2] R. Koerver, et el., Ener. Environ. Sci. 11 (2018) 2142