Subproject 4: Effect of pressure on transport properties of granular lithium ion conductors
We want to apply the new piston cylinder apparatus which was developed during the first period of the project. The method allows direct measurement of impedance spectra and volume changes during compaction in function of temperature and pressure. Using an atmosphere with controlled humidity and oxygen partial pressure, the powders can be pre-conditioned at run temperature before starting compression. We expect in particular that H2O has major impact on compaction kinetics and in turn on lithium mobility. Microanalytical and spectroscopic methods will give insights to structural and topological modifications upon compaction. NMR measurements and, if possible, mechanical relaxation spectroscopy will provide information about lithium mobility in starting materials and post-experimental samples.
Fig.: Arrhenius plot of the specific conductivity for petalite single crystals (Taken from .)
Employees: D. Murawski, M. Sc.
 J. Rahn, E. Hüger, L. Dörrer, B. Ruprecht, P. Heitjans, and H. Schmidt, Phys. Chem. Chem. Phys. 14 (2012) 2427.
 A.-M. Welsch, H. Behrens, S. Roß, and D. Murawski, Z. Phys. Chem. 226 (2012) 491.