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.
Highlights
IntroductionFor Li-ion batteries (LIBs) cells, electrolytes based on carbonates solvents are state-of-the-art materials
Li-ion batteries (LIBs) are undeniably the current world leader in solving energy storage problems.For LIB cells, electrolytes based on carbonates solvents are state-of-the-art materials
We previously investigated the effect of Li-salt concentration on the variation of the Li-Quasi-Reference Electrode (QRE) potential in Dimethyl sulfoxide (DMSO)-based electrolytes [4]
Summary
For LIB cells, electrolytes based on carbonates solvents are state-of-the-art materials. These electrolytes possess a relatively low electrochemical stability window that limits their use for both generation 5V cathodes and Li metal anodes [1]. Recent reports on the use of concentrated solutions as electrolytes for future Li batteries have been on the rise [2,3]. We previously investigated the effect of Li-salt concentration on the variation of the Li-QRE potential in DMSO-based electrolytes [4]. Based on our previous results, the trend in the potential shift is more pronounced at high salt concentrations owing to the change in the coordination structure of Li+ ions
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