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Entropy-Driven Liquid Electrolytes for Lithium Batteries.

Qidi Wang1, Chenglong Zhao1, Zhenpeng Yao2

  • 1Department of Radiation Science and Technology, Delft University of Technology, Delft, 2629JB, The Netherlands.

Advanced Materials (Deerfield Beach, Fla.)
|January 31, 2023
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Summary
This summary is machine-generated.

High-entropy electrolytes, using multiple lithium salts, improve battery performance by enhancing ion movement and stabilizing electrode interfaces. This leads to longer cycle life and better capacity retention in lithium batteries.

Keywords:
entropy-driven electrolyteshigh-entropy electrolyteslithium batteriestemperature-dependent electrolytesweak solvation structures

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Area of Science:

  • Electrochemistry
  • Materials Science

Background:

  • Developing advanced liquid electrolytes is crucial for improving lithium battery kinetics and interphase stability.
  • Poor solubility of lithium salts in conventional solvents limits electrolyte performance.

Purpose of the Study:

  • To investigate the use of high-entropy solutions formed by multiple salts to overcome solubility limitations and enhance electrolyte properties.
  • To stabilize electrode-electrolyte interphases and improve lithium battery performance.

Main Methods:

  • Forming high-entropy solutions by introducing multiple lithium salts into solvents.
  • Analyzing the altered solvation structure and its effect on salt solubility and interphase formation.
  • Testing the performance of high-entropy electrolytes in lithium-metal and commercial battery systems.

Main Results:

  • High-entropy electrolytes significantly enhance cycling and rate performance in lithium batteries.
  • Achieved over 99% reversibility for lithium-metal anodes, extending cycle life under aggressive conditions.
  • Commercial batteries with graphite anodes and LiNi$_{0.8}$Co$_{0.1}$Mn$_{0.1}$O$_{2}$ cathodes demonstrated over 1000 cycles with >90% capacity retention.

Conclusions:

  • The unique solvation structure in high-entropy electrolytes improves lithium-ion kinetics and stabilizes interphases.
  • High-entropy electrolytes enable lower operating temperatures due to decreased melting points.
  • This approach offers a promising strategy for developing next-generation lithium batteries.