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

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...

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Bibliographic Details
Published inEnergies (Basel) Vol. 13; no. 6; p. 1470
Main Authors Kottam, P. K. R., Dongmo, S., Wohlfahrt-Mehrens, M., Marinaro, M.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2020
Subjects
Anode effect
Batteries
Cathodes
Coordination
cyclic voltammetry
Dimethyl sulfoxide
donor number
Electrodes
Electrolytes
ferrocene
high concentrated electrolytes
Life span
Lithium
Lithium batteries
nernst equation
Redox potential
reference electrode
Salts
Solvents
Spectrum analysis
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en13061470