Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 49: Topical Session Battery Materials I

MM 49.4: Vortrag

Donnerstag, 25. März 2010, 11:30–11:45, H6

Atom probe tomography of solid state ion-conductive membranes — •Gerd-Hendrik Greiwe, Guido Schmitz, and Frank Berkemeier — Institut für Materialphysik WWU Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Deutschland

Our group has long-termed interest in glassy ion-conductive membranes to be used in all solid state batteries. Using ion beam sputtering methods, we could demonstrate that thin film membranes of amorphous Li-borate glass reveal a conductivity even better than quenched bulk glasses and furthermore a finite-size effect was documented (1,2). However, the Li content of sputter deposited thin films could not be determined by conventional EDX or EELS analysis due to the low mass of Li.

In new experiments, we measure the Li content of the glass by means of laser-assisted atom probe tomography. For this, glass layers and suitable electrodes are deposited upon pre-shaped tungsten tips. Although quite complex, the obtained mass spectra are well understood in terms of various molecular species so that a quantitative analysis gets possible. It is indicated that the reported finite-size effect is due to indiffusion of Li from the electrode materials.

(1) F. Berkemeier, M.R. Abouzari, and G. Schmitz, Phys. Rev. B 76, (2007) 024205.

(2) F. Berkemeier, M.R. Abouzari, G. Schmitz, Ionics, DOI 10.1007/s11581-008-0266-4.