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Understanding electrolyte mass transfer during charge–discharge reactions is essential for developing next-generation storage batteries with high energy densities. In this study, we investigated Li+ transport in a highly concentrated electrolyte (HCE) consisting of an equimolar mixture of lithium bis(fluorosulfonyl)amide (LiFSA) and tetraglyme (G4) under current reversal and re-reversal. Concentration profiles of the electrolyte at a distance of 0–600 μm from the Li electrodes were obtained using in situ laser interferometry. The Li+ transference numbers and LiFSA diffusion coefficients were calculated from these profiles. Raman
spectroscopy suggested that the coordination structure surrounding Li+ ions in the electrolytes mainly contributed to the transference number. A one-dimensional unsteady diffusion equation and the finite difference method were employed to simulate the concentration profiles. The maximum error percentage between the measured and simulated values was only 3%, confirming the accuracy and validity of the interferometric measurements. Our findings on Li-ion transfer in HCEs could promote the rational design of high-energy-density Li-ion batteries with higher cation transference numbers of electrolytes and charge–discharge rates.

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Date published: 2024-04-01

Publisher: The Electrochemical Society

Journal:

• Journal of The Electrochemical Society (ISSN: 00134651) p. 40519- 040519

Funding:

• Japan Science and Technology Agency JPMJPF2016
• Japan Society for the Promotion of Science 23KJ0054

Manuscript type: Not a journal article

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First published URL: https://doi.org/10.1149/1945-7111/ad3ad1

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Updated at: 2024-08-26 17:36:35 +0900

Published on MDR: 2025-04-17 08:40:23 +0900