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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

Author

Listed:
  • 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)

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.

Suggested Citation

  • P. K. R. Kottam & S. Dongmo & M. Wohlfahrt-Mehrens & M. Marinaro, 2020. "Effect of Salt Concentration, Solvent Donor Number and Coordination Structure on the Variation of the Li/Li + Potential in Aprotic Electrolytes," Energies, MDPI, vol. 13(6), pages 1-9, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1470-:d:334929
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