Effect of Salt Concentration, Solvent Donor Number and Coordination Structure on the Variation of the Li/Li + Potential in Aprotic Electrolytes

P. K. R. Kottam, S. Dongmo, M. Wohlfahrt-Mehrens and M. Marinaro
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P. K. R. Kottam: ZSW—Zentrum für Sonnenenergie und Wasserstoff-Forschung Baden-Württemberg, 89081 Ulm, Germany
S. Dongmo: ZSW—Zentrum für Sonnenenergie und Wasserstoff-Forschung Baden-Württemberg, 89081 Ulm, Germany
M. Wohlfahrt-Mehrens: ZSW—Zentrum für Sonnenenergie und Wasserstoff-Forschung Baden-Württemberg, 89081 Ulm, Germany
M. Marinaro: ZSW—Zentrum für Sonnenenergie und Wasserstoff-Forschung Baden-Württemberg, 89081 Ulm, Germany

Energies, 2020, vol. 13, issue 6, 1-9

Abstract: The use of concentrated aprotic electrolytes in lithium batteries provides numerous potential applications, including the use of high-voltage cathodes and Li-metal anodes. In this paper, we aim at understanding the effect of salt concentration on the variation of the Li/Li + Quasi-Reference Electrode (QRE) potential in Tetraglyme (TG)-based electrolytes. Comparing the obtained results to those achieved using Dimethyl sulfoxide DMSO-based electrolytes, we are now able to take a step forward and understand how the effect of solvent coordination and its donor number (DN) is attributed to the Li-QRE potential shift. Using a revised Nernst equation, the alteration of the Li redox potential with salt concentration was determined accurately. It is found that, in TG, the Li-QRE shift follows a different trend than in DMSO owing to the lower DN and expected shorter lifespan of the solvated cation complex.

Keywords: lithium; reference electrode; high concentrated electrolytes; ferrocene; Nernst equation; cyclic voltammetry; donor number (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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