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Fluorinated Carbamates as Suitable Solvents for LiTFSI-Based Lithium-Ion Electrolytes: Physicochemical Properties and Electrochemical Characterization

Abstract : Herein, we present an extensive physicochemical characterization of a series of fluorinated and nonfluorinated carbamates and their application as electrolyte solvents comprising lithium trifluoromethanesulfonyl imide (LiTFSI) as conducting salt. In a second step, these electrolyte compositions were characterized with respect to their ionic conductivity, salt dissociation, and electrochemical stability toward oxidation. In a third step, selected fluorinated electrolytes were studied concerning their ability to enable the utilization of LiTFSI as a conducting salt in the presence of an aluminum current collector by forming a protective aluminum fluoride surface layer, thus preventing the continuous anodic aluminum dissolution, i.e., aluminum corrosion. Finally, their electrochemical performance in combination with a state-of-the-art lithium-ion cathode material, Li(Ni1/3Mn1/3Co1/3)O2 (NMC), was investigated. It is shown that higher fluorinated carbamates reveal a very stable cycling performance of such cathodes due to their ability to form a sufficiently thick, i.e., protective, aluminum fluoride layer on the surface of the aluminum current collector. These findings confirm their suitability as electrolyte solvents in combination with LiTFSI as a conducting salt, enabling the successful replacement of toxic and unstable LiPF6 for the development of intrinsically safer lithium-ion batteries.
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https://hal.univ-grenoble-alpes.fr/hal-01883279
Contributeur : Fannie Alloin <>
Soumis le : jeudi 27 septembre 2018 - 22:44:45
Dernière modification le : vendredi 17 juillet 2020 - 11:38:07

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Marco Bolloli, Julian Kalhoff, Fannie Alloin, Dominic Bresser, My Loan Phung Le, et al.. Fluorinated Carbamates as Suitable Solvents for LiTFSI-Based Lithium-Ion Electrolytes: Physicochemical Properties and Electrochemical Characterization. Journal of Physical Chemistry C, American Chemical Society, 2015, 119 (39), pp.22404 - 22414. ⟨10.1021/acs.jpcc.5b07514⟩. ⟨hal-01883279⟩

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