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Solvation Interactions in Water-DMSO Electrolyte Systems for Enhanced Aqueous Lithium Battery Performance.

Gil Bergman1, Nicole Leifer1, Yaroslav Zhigalenok2

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PubMed
Summary

Dimethyl sulfoxide (DMSO) hybrid electrolytes offer enhanced safety and performance for aqueous lithium batteries. This study explores their behavior at high salt concentrations, revealing insights into solvation structures and electrode performance.

Keywords:
DMSO−water interactionsLiMn2O4TiO2aqueous Li-ion batteriesaqueous electrolyteshybrid electrolyte solutions

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Hybrid electrolytes combining water and organic solvents offer improved electrochemical stability, safety, and conductivity.
  • Dimethyl sulfoxide (DMSO) is a promising cosolvent due to its high dielectric constant and chemical stability.
  • Understanding water-DMSO electrolyte behavior under high salt concentrations is crucial for battery applications but remains underexplored.

Purpose of the Study:

  • Investigate the properties of nearly saturated LiClO4 solutions in water-DMSO mixtures.
  • Elucidate solvation structures and ion-solvent interactions in these hybrid electrolytes.
  • Evaluate the impact of electrolyte composition on LiMn2O4 cathode and TiO2 anode performance.

Main Methods:

  • Electrochemical testing (e.g., cyclic voltammetry, galvanostatic cycling).
  • Spectroscopic techniques including Nuclear Magnetic Resonance (NMR) and Raman spectroscopy.
  • Theoretical modeling and computational simulations.

Main Results:

  • Characterized physicochemical property changes (viscosity, density, dielectric constant) with varying water-DMSO ratios.
  • Revealed specific ion-solvent interactions and solvation shell structures using spectroscopy and modeling.
  • Demonstrated the influence of electrolyte composition on the cycling stability and performance of LiMn2O4 cathodes and TiO2 anodes.

Conclusions:

  • DMSO-based hybrid electrolytes show significant potential for advanced aqueous lithium battery technologies.
  • Tailoring water-DMSO composition can optimize electrolyte properties and electrode performance.
  • This research provides fundamental insights into safe and high-performance battery electrolyte design.