Complete characterization of a lithium battery electrolyte using a combination of electrophoretic NMR and electrochemical methods

Hickson, Darby T.; Halat, David M.; Ho, Alec S.; Reimer, Jeffrey A.; Balsara, Nitash P.

doi:10.1039/d2cp02622h

Title: Complete characterization of a lithium battery electrolyte using a combination of electrophoretic NMR and electrochemical methods

Journal Article · Fri Sep 16 00:00:00 EDT 2022 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/d2cp02622h· OSTI ID:2282867

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Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Materials Sciences Division; University of California, Berkeley, CA (United States)

Improving transport properties of electrolytes is important for developing lithium-ion batteries for future energy storage applications. In Newman's concentrated solution theory, electrolytes are characterized by three transport parameters, conductivity, diffusion coefficient, and transference number, in addition to the thermodynamic factor. In this work, these parameters are all determined for an exemplar liquid electrolyte, lithium bis(trifluoromethanesulfonyl)imide mixed in tetraethylene glycol dimethyl ether, using electrochemical methods. The intrinsic coupling between parameters obtained by electrochemical methods results in large error bars in the transference number that obscure the transport behavior of the electrolyte. Here, we use electrophoretic NMR (eNMR) to measure the electric-field-induced ion and solvent velocities to obtain the transference number directly, which enables determination of the thermodynamic factor with greater certainty. In conclusion, our work indicates that the combination of eNMR and electrochemical methods provides a robust approach for complete characterization of battery electrolytes.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231; DGE-2020294884

OSTI ID:: 2282867

Alternate ID(s):: OSTI ID: 1894719

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Vol. 24, Issue 43; ISSN 1463-9076

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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