Super-concentrated electrolyte solutions are of increasing interest for safer and more stable lithium and post-lithium batteries. The combination of 7Li and 17O (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.
Irene Ruggeri, A.L.M. (2019). Correlating Structure and Properties of Super-Concentrated Electrolyte Solutions: 17O NMR and Electrochemical Characterization. CHEMELECTROCHEM, 6, 4002-4009 [10.1002/celc.201900829].
Correlating Structure and Properties of Super-Concentrated Electrolyte Solutions: 17O NMR and Electrochemical Characterization
Irene Ruggeri;Andrea La Monaca;Francesca De Giorgio;Francesca Soavi;Catia Arbizzani
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2019
Abstract
Super-concentrated electrolyte solutions are of increasing interest for safer and more stable lithium and post-lithium batteries. The combination of 7Li and 17O (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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
