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

ZSW—Zentrum für Sonnenenergie und Wasserstoff-Forschung Baden-Württemberg, 89081 Ulm, Germany
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Energies 2020, 13(6), 1470; https://doi.org/10.3390/en13061470
Received: 20 February 2020 / Revised: 12 March 2020 / Accepted: 17 March 2020 / Published: 20 March 2020
(This article belongs to the Special Issue Novel Technologies for Metal-Ion and Metal Batteries)
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. View Full-Text
Keywords: lithium; reference electrode; high concentrated electrolytes; ferrocene; Nernst equation; cyclic voltammetry; donor number lithium; reference electrode; high concentrated electrolytes; ferrocene; Nernst equation; cyclic voltammetry; donor number
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Kottam, P.K.R.; Dongmo, S.; Wohlfahrt-Mehrens, M.; Marinaro, M. Effect of Salt Concentration, Solvent Donor Number and Coordination Structure on the Variation of the Li/Li+ Potential in Aprotic Electrolytes. Energies 2020, 13, 1470.

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