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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

descriptionPublicationkeyboard_double_arrow_right Article , Other literature type , Journal 20 Mar 2020Embargo end date: 29 Nov 2021 Germany Publisher:MDPI AGJournal:Energies, volume 13, page 1,470 (eissn: 1996-1073,

Authors: P. K. R. Kottam; S. Dongmo; M. Wohlfahrt-Mehrens; M. Marinaro;

doi: 10.3390/en13061470 , 10.18725/oparu-40039

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

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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.

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Germany

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Keywords

Technology, DDC 540 / Chemistry & allied sciences, info:eu-repo/classification/ddc/540, T, high concentrated electrolytes, ferrocene, Lithium, nernst equation, reference electrode, donor number, cyclic voltammetry, lithium, Nernst equation, Ferrocene, Ferrocen

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