Potentiometric MRI of a Superconcentrated Lithium Electrolyte: Testing the Irreversible Thermodynamics Approach

نویسندگان

چکیده

Superconcentrated electrolytes, being highly thermodynamically nonideal, provide a stringent proving ground for continuum transport theories. Herein, we test an ostensibly complete model of LiPF6 in ethyl-methyl carbonate (EMC) based on the Onsager–Stefan–Maxwell theory from irreversible thermodynamics. We perform synchronous magnetic resonance imaging (MRI) and chronopotentiometry to examine how superconcentrated LiPF6:EMC responds galvanostatic polarization open-circuit relaxation. simulate this experiment using independently parametrized with six composition-dependent electrolyte properties, quantified up saturation. Spectroscopy reveals increasing ion association solvent coordination salt concentration. The potentiometric MRI data agree closely predicted distributions overpotentials, providing completely independent validation theory. electrolytes exhibit strong cation–anion interactions extreme solute-volume effects that mimic elevated lithium transference. Our simulations allow surface overpotentials be extracted cell-voltage track interfaces. Potentiometric is powerful tool illuminate electrolytic phenomena.

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ژورنال

عنوان ژورنال: ACS energy letters

سال: 2021

ISSN: ['2380-8195']

DOI: https://doi.org/10.1021/acsenergylett.1c01213