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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster I
CPP 17.37: Poster
Montag, 9. März 2026, 19:00–21:00, P5
Structural and Ionic Transport Properties of Li3-3xDy1+xCl6 Solid Electrolytes — •Francesco Falsina1,2, Peter Müller-Buschbaum1, and Anatoliy Senyshyn2 — 1TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — 2MLZ, TUM, Garching, Germany
Ternary lithium lanthanide chlorides, Li3RCl6 (R = rare earth), have recently emerged as promising solid electrolytes. Although initially thought to exhibit low ionic conductivity, later studies showed that ball milling synthesis, by leading to microstructure modification, can raise conductivity to ∼10−3 S·cm−1. In this work we studied the Li3−3xDy1+xCl6 system (x = −0.1 to 0.1). For x=0, we assessed how annealing conditions affect structure and conductivity. Ionic transport was measured using isostatically pressed, gold-sputtered pellets and broadband impedance spectroscopy. XRD, DSC, and EIS analyses of as-milled, annealed, and melt-synthesized samples show that conductivity decreases by nearly an order of magnitude after annealing, while over-lithiated compositions consistently display higher conductivity, highlighting the impact of lithium retention. DSC and XRD also reveal an orthorhombic-to-trigonal transition with increasing lithium content. Overall, these results clarify how composition and disorder govern ionic transport in the Li3MCl6 electrolyte family.
Keywords: Solid electrolytes; All solid state batteries; Electrochemical energy storage