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Molecular-level heterogeneity in deep eutectic electrolytes.

Mirna Alhanash1, Carolina Cruz1, Patrik Johansson1,2

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Deep eutectic electrolytes show varying molecular structures impacting lithium battery performance. Balancing molecular heterogeneity and hydrogen bond networks is key for efficient ion transport in next-generation batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Deep eutectic electrolytes (DEEs) are promising for advanced lithium batteries.
  • Understanding the link between DEE molecular properties and battery performance is crucial.
  • Current knowledge on DEE molecular behavior and its macroscopic impact is limited.

Purpose of the Study:

  • To investigate the molecular-level properties of simple DEEs using molecular dynamics simulations.
  • To elucidate the relationship between anion characteristics, molecular heterogeneity, and ion transport.
  • To identify key factors for optimizing DEEs for high-performance lithium batteries.

Main Methods:

  • Utilized molecular dynamics (MD) simulations to study DEEs composed of N-methyl-acetamide (NMA) and lithium salts (LiBF4, LiDFOB, LiBOB) at a 1:4 molar ratio.
  • Analyzed molecular-level heterogeneity (MLH), including local structure, coordination, and dynamic disorder.
  • Examined the impact of anion size and symmetry on the hydrogen bond (HB) network and ion aggregation.

Main Results:

  • Anion size and symmetry significantly influence MLH and the heterogeneity of the HB network.
  • Larger, more asymmetric anions lead to a more localized HB network and increased ion pairing.
  • DEEs with higher MLH exhibit slower ion self-diffusion due to steric hindrance and localized HB networks.

Conclusions:

  • Molecular-level heterogeneity and HB network characteristics are critical determinants of DEE performance.
  • Optimizing DEEs requires a careful balance between MLH and HB network properties for efficient ion transport.
  • Findings provide insights for designing next-generation lithium batteries with improved DEE electrolytes.