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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: Energy Storage and Batteries II
CPP 40.4: Vortrag
Freitag, 21. März 2025, 10:15–10:30, H34
Temperature-resolved Crystal Structure of Ethylene Carbonate — •Lea Westphal1,2, Vladislav Kochetov2, Volodymyr Baran3, Maxim Avdeev4,5, Peter Müller-Buschbaum1, and Anatoliy Senyshyn2 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2MLZ, TUM, 85748 Garching, Germany — 3DESY, 22607 Hamburg, Germany — 4ANSTO, NSW 2234, Sydney, Australia — 5School of Chemistry, University of Sydney, NSW 2006, Sydney, Australia
Lithium-ion batteries (LIBs) have been a dominant power source for portable electronics for over three decades and are of interest for applications in electric vehicles and large-scale energy storage systems. Despite significant advancements in LIB design, the main solvents used in the liquid electrolytes, responsible for the charge transfer between the electrodes, have largely remained the same. A key class of these solvents are linear and cyclic carbonates, which, when two or more solvents are combined with lithium salts and additives, exhibit favorable physical/chemical properties. Ethylene carbonate (EC) is a common solvent in commercial batteries due to its high dielectric constant and its ability to form the protective solid-electrolyte interphase (SEI) layer. However, it has to be mixed with other solvents because of its high melting point. Following the determination of EC’s crystal structure from single crystals, this study presents temperature dependent Neutron and Synchrotron Powder Diffraction data, studying the sample from 3 K up to its melting point and investigations by Synchrotron Total Scattering and Pair Distribution Function analysis.
Keywords: Powder Diffraction; Crystal Structure; Total Scattering; Carbonate Esters