SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 5: Materials in Energy Conversion: Mechanical Properties and Solid State Batteries

MM 5.9: Vortrag

Montag, 27. März 2023, 12:30–12:45, SCH A 215

Exploration of cathode-stable layered solid-state electrolytes — •Sina Ziegler, Christoph Scheurer, and Karsten Reuter — Fritz-Haber-Institut der MPG, Berlin, Germany

Promising higher safety and capacity, all-solid-state lithium batteries are envisioned to replace standard lithium-ion batteries in the future. Lithium thiophosphates achieve the highest Li ion conductivities of all solid-state electrolytes (SSE) known to date but their instability towards high-performance electrodes remains a critical challenge. To address this issue, we investigate the concept of rare earth lithium halides as a material-efficient, nanometer thick cathode coating in contact with thiophosphate electrolytes. Halides provide wide electrochemical stability windows as well as good chemical and thermodynamic stability [1,2].

To determine a suitable halide/thiophosphate combination, an energetically feasible reaction pathway in the multidimensional phase diagram between the two materials needs to be identified. Consequently, the thermodynamic stabilities of the emerging SSE / halide interfaces are examined by ab initio thermodynamics to screen reaction free enthalpies of possible interface reactions. Next, an end member analysis is performed to analyze possible compositions of interface products and possible secondary phases.

[1] J. Liang et al., Acc. Chem. Res. 2021, 54, 1023-1033 [2] K. Kim et al., Chem. Mater. 2021, 33, 10, 3669-3677