Correlating Structure and Properties of Super‐Concentrated Electrolyte Solutions: 17O NMR and Electrochemical Characterization. Issue 15 (13th August 2019)

• Record Type: Journal Article
• Authors: Ruggeri, Irene; La Monaca, Andrea; De Giorgio, Francesca; Soavi, Francesca; Arbizzani, Catia; Berbenni, Vittorio; Ferrara, Chiara; Mustarelli, Piercarlo
• Is Part Of: ChemElectroChem. Volume 6:Issue 15(2019)
• Page Start: 4002
• Page End: 4009
• Publication Date: 2019-08-13
• Subjects: solvent in salt solutions -- glyme -- 17O NMR -- 7Li NMR; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201900829
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Super‐concentrated electrolyte solutions are of increasing interest for safer and more stable lithium and post‐lithium batteries. The combination of 7 Li and 17 O (at natural abundance) nuclear magnetic resonance (NMR) and electrochemical characterization is proposed here as an effective approach to investigate the Li + solvation structures and properties of electrolytes featuring tetraethylene glycol dimethyl ether (TEGDME) and lithium‐bis(trifluoromethane sulfonyl) imide (LiTFSI). Five different formulations from salt‐in‐solvent to solvent‐in‐salt with LiTFSI at different concentrations (0.1 m, 0.5 m, 2 m, 4 m, 5 m) are investigated. The NMR results, also supported by physico‐chemical characterizations such as thermal gravimetric analyses, differential scanning calorimetry, specific conductivity and viscosity, give information about the association of Li + ions with anion and solvent molecules, allowing a deeper knowledge on the relationships among structure and functional properties of super‐concentrated solutions. Abstract : More salt, more stability ? The combination of nuclear magnetic resonance (NMR) including 7 Li and 17 O at natural abundance and electrochemical characterization is a powerful and effective approach to perform a deep investigation of solvation structures of Li + in electrolyte based on TEGDME and LiTFSI, from salt‐in‐solvent to solvent‐in‐salt.