Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 8: Solid-liquid interfaces: Structure, Spectroscopy I
O 8.2: Talk
Monday, March 12, 2018, 10:45–11:00, MA 144
In-situ and operando near sulfur K-edge X-ray absorption spectrometry of Li-S battery coin cells — •Claudia Zech1, Olga Grätz2, Svetlozar Ivanov3, Daniel Grötzsch4, Philipp Hönicke1, Yves Kayser1, Manfred Stamm2 und Burkhard Beckhoff1 — 1Physikalisch-Technische Bundesanstalt, Berlin, Germany — 2Leibniz-Institut für Polymerforschung, Dresden, Germany — 3Technische Universität, Ilmenau, Germany — 4Technische Universität, Berlin, Germany
Lithium Sulfur (Li-S) batteries are promising candidates for improved batteries offering up to 5 times higher capacity than conventional lithium ion batteries. For a better understanding of battery degradation processes in-situ and in-operando characterization techniques are required. By means of in-operando near sulfur K-edge X-ray absorption spectrometry recorded during galvanostatic cycling with potential limitation (GCPL) measurements we could determine the different sulfur species for 8 cycles of a Li-S battery with DOL/DME (1:1 wt.%) 1 Mol TFSI electrolyte. In particular, the formation of polysulfides could be revealed. We used CR-2032 coin cell formed Li-S batteries modified with thin windows enabling the transmission of excitation and fluorescence radiation. Traceable X-ray spectrometric measurements were performed using radiometrically calibrated instrumentation in the PTB laboratory at BESSY II synchrotron radiation facility. While for the first cycles the polysulfides convert almost entirely we see for further cycles a permanent appearance.