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Long Chain Li and Na Alkyl Carbonates as Solid Electrolyte Interphase Components: Structure, Ion Transport and Mechanical Properties Lukas Schafzahl, Heike Ehmann, Manfred Kriechbaum, Jürgen Sattelkow, Thomas Ganner, Harald Plank, Martin Wilkening, and Stefan A. Freunberger Chem. Mater., Just Accepted Manuscript • DOI: 10.1021/acs.chemmater.8b00750 • Publication Date (Web): 03 May 2018 Downloaded from http://pubs.acs.org on May 3, 2018
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Chemistry of Materials
Long Chain Li and Na Alkyl Carbonates as Solid Electrolyte Interphase Components: Structure, Ion Transport and Mechanical Properties Lukas Schafzahl1, Heike Ehmann1, Manfred Kriechbaum2, Jürgen Sattelkow3,4, Thomas Ganner3, Harald Plank3,4, Martin Wilkening1,5, Stefan A. Freunberger1* 1
Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria 2 Institute of Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria 3 Institute of Electron Microscopy and Nanoanalysis (FELMI), Graz University of Technology, Steyrergasse 17, 8010 Graz, Austria 4 Graz Centre for Electron Microscopy (ZFE), Steyrergasse 17, 8010 Graz, Austria 5 Christian Doppler Laboratory for Lithium Batteries, and Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria ABSTRACT: The solid electrolyte interphase (SEI) in Li and Na ion batteries forms when highly reducing or oxidizing electrode materials get in contact with liquid organic electrolyte. Its ability to form a mechanically robust, ion conducting and electron insulating layer critically determines performance, cycle life and safety. Li or Na alkyl carbonates (LiAC and NaAC), respectively, are lead SEI components in state-of-the-art carbonate based electrolytes and their fundamental understanding regarding charge transport and mechanical properties may hold key to designing electrolytes forming an improved SEI. We synthesized a homologous series of LiACs and NaACs from methyl to octyl analogs and characterized them with respect to structure, ionic conductivity and stiffness. The compounds assume layered structures except for the lithium methyl carbonate. Room temperature conductivities were found to be ~10–9 S·cm–1 for lithium methyl carbonate and
