Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Battery Materials

MM 15.4: Vortrag

Montag, 12. März 2018, 18:15–18:30, H 0106

Multidimensional operando Analysis of Lithium/Sulfur Cells with X-ray Radiography — •Sebastian Risse¹, Benjamin Kent¹, Arne Ronneburg¹, André Hilger², Nikolay Kardjilov², Ingo Manke², and Matthias Ballauff^1,3 — ¹Institute of Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin, 14109 Berlin — ²Institute of Applied Materials, Helmholtz-Zentrum Berlin, 14109 Berlin — ³Institute of Physics, Humboldt University of Berlin, 10099 Berlin

Lithium/sulfur (Li/S) batteries have a fivefold higher theoretical gravimetric energy density (2680 Wh/kg) than state-of-the-art lithium ion batteries. In addition, the abundant raw materials qualify this electrochemical storage system as one of the most promising candidates for the post-lithium-ion-era. However, the strong fading of electrochemical storage capacity with increasing cycle number is still a major obstacle to a broad technical use despite decades of research. Operando techniques are very suitable tools to gain mechanistic understanding of degradation processes. Especially the simultaneous combination of several independent measurements (multidimensional) while the Li/S cell is in operation allows deep insights into the degradation mechanisms. Here we present results of a novel setup where five different measurements are simultaneously performed. EIS, UV-vis spectroscopy, temperature and X-ray radiography were performed over ten cycles while the cell was galvanostically charged and discharged. Changes on the macroscopic scale can be correlated to characteristic signals in the EIS and UV-vis spectroscopy as well as the capacity fading curve.