Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 60: Focus: Fundamentals of molecular liquids, ionic liquids and mixtures I

CPP 60.3: Hauptvortrag

Mittwoch, 18. März 2020, 12:00–12:30, ZEU 222

Operando Analysis of the Lithium/Sulfur Battery by Small-Angle Neutron and X-Ray Scattering — •Matthias Ballauff1, Sebastian Risse2, Eneli Härk2, Günter Goerigk2, Chanbum Park2 und Joachim Dzubiella31Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany — 2Helmholtz-Zentrum Berlin fuer Materialien und Energie, Hahn Meitner Platz 1,14109 Berlin, Germany — 3Applied Theoretical Physics and Computational Physics, Physikalisches Institut, Albert-Ludwigs-Universitaet Freiburg, Hermann-Herder Strasse 3, D-79104 Freiburg, Germany

The lithium-sulfur battery is among the most promising candidates for future battery systems. Sulfur is an earth-abundant element and there are first applications of Li/S-batteries in aviation. In our presentation, we shall present our recent work on Li/S batteries in two parts: Part I is related to our recent studies of the carbonaceous materials used as cathodes in these systems. Here we improved the analysis by small-angle x-ray scattering in order to obtain reliable data on the internal surface and the average pore size. In a second part we shall discuss our operando-studies of the Li/S system by small-angle neutron scattering (SANS). SANS allows us to use contrast matching in order to see the precipitation and the dissolution of sulfur and lithium sulfide during the electrochemical cycling of the battery. The operando studies are combined with MD-simulations addressing the solvation of the soluble sulfur species during cycling of the Li/S-cell.

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