Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 20: Poster session II

MM 20.26: Poster

Tuesday, April 2, 2019, 18:30–20:00, Poster C

Ionic conductivity of LiBH4 molten films — •Efi Hadjixenophontos, Janina Trück, and Guido Schmitz — Heisenbergstrasse 3, 70569, University of Stuttgart, Institute of Materials Science, Departement of Materials Physics, Stuttgart, Germany

The fast Li ion conductivity in LiBH4 envisage its use as electrolyte in all solid state batteries. Whereas powders are commonly used, thin films provide a tool for examining the Li transport and learning more about such complicated systems. In this work films of LiBH4 are prepared by melting LiBH4 powder and their thickness is minimized by using spin coating. The two methods demonstrate reproducible thicknesses from 18.6 *m when flattened with a spatula and 5.3-1.3 *m depending on the rotation speed during spin coating. All layers are characterized by SEM for their thickness and by EDX and XPS for their composition. Though XPS investigations confirm the identification of the light elements composing LiBH4, EDX measurements reveal high oxygen quantities at the surface of the samples indicating the high sensitivity of the samples to air. The ionic conductivity is investigated by EIS and the change in the crystal structure is observed depending on temperature. The highest conductivity is achieved at 10-2 S/cm in the HT phase. Furthermore, the effect of different current collectors for improving the system is tested and Pt shows to improve the spin coating method.