Dresden 2026 – scientific programme

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FM: Fachverband Funktionsmaterialien

FM 5: Focus Session: Holistic structural and safety assessment of battery materials and cells

FM 5.3: Talk

Monday, March 9, 2026, 15:30–15:45, BEY/0E40

Synthesizing the Solid-State Electrolyte LLZO via the Mixed-Oxide Route: The Li loss - Reality or Fiction? — •Daniel Wagner, Torsten E.M. Staab, and Dominik Boras — LCTM/IFB, Julius-Maximilians Universität Würzburg, D-97070 Würzburg, Röntgenring 11

The solid-state electrolyte LLZO is discussed for applications in all solid-state batteries. Undoped and Fe-doped LLZO (Li₇La₃Zr₂O₁₂) samples have been synthesized via the mixed-oxide route, i.e. grinding of the educt’s powders followed by calcination at 950^∘C for 6h and a second grinding before pressing into pellets and finally sintering them at 1200^∘C. The excess Li content and the restrictiveness for atmospheric gas exchange during the synthesis has been varied through usage of lidded crucibles. The samples were characterized by thermogravimetric analysis (TG), mass spectroscopy of its decomposition gas (TG/MS), X-Ray-diffraction (XRD) in reflection geometry and scanning electron microscopy (SEM).The formed phases (cubic and tetragonal) were identified by XRD. The phase fraction showed a clear influence of a varying lithium-excess and/or usage of a restricted gas exchange capability. Lattice defects were investigated by the method of positron annihilation lifetime spectroscopy (PALS). PALS showed clear differences after calcination and at different stages of sintering for both un-doped and Fe-doped samples. One option may be increasingly filled Li-lattice sites after the calcination step or a formation of amorphous Li containing phases. No traces of Li were found in the decomposition gases.

Keywords: LLZO; Li-loss; Li-excess; PALS; XRD