Berlin 2024 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 15: Poster I
CPP 15.25: Poster
Monday, March 18, 2024, 18:00–20:00, Poster C
Temperature dependent crystal structure of Ethylene Carbonate — •Lea Westphal1,2,3, Volodymyr Baran4, Peter Müller-Buschbaum1,2, Florence Porcher3,5, and Anatoliy Senyshyn2 — 1TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — 2MLZ, TUM, Garching, Germany — 3Laboratoire Leon Brillouin, UMR12 CEA-CNRS, Gif-sur-Yvette Cedex, France — 4DESY, Hamburg, Germany — 5ESS, Lund, Sweden
Performance and safety/stability of Li-ion batteries can be improved by joint optimisation of the charge-storing electrode materials and charge transfer-mediating liquid electrolytes. Most of the research on this has been focused on the electrodes, whilst electrolytes are less studied. An important class of solvents used in liquid electrolytes are linear and cyclic carbonates, because of the combination of physical/chemical properties, electrochemical performance and stability in a mixture with two or more solvents together with a lithium salt. Ethylene carbonate (EC), being the only solvent able to provide the protective SEI layer, is present in almost all commercial batteries, mixed with other solvents. [1] After the determination of the crystal structure of EC [2], this contribution presents room temperature data obtained by Neutron Powder Diffraction at SPODI (FRM II), Total Scattering and temperature dependent Powder X-Ray Diffraction data from beamline P02.1 (DESY), showing the structural evolution at different temperatures.
[1] J.-M. Tarascon & M. Armand, Nature 414, 359-367 (2001).
[2] C.J. Brown, Acta Cryst. 7, 92-96, (1954).
Keywords: battery electrolyte; ethylene carbonate; powder diffraction; crystal structure