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Butadiene Sulfone Based Binary Deep Eutectic Electrolyte for High Performance Lithium Metal Batteries.

Tiankun Zhou1, Chengjun Lei1, Jinye Li1

  • 1State Key Laboratory of Chem/Biosensing and Chemometrics, Joint International Research Laboratory of Energy Electrochemistry, Joint International Research Laboratory of Energy Electrochemistry, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China.

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|July 15, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a new nonflammable deep eutectic electrolyte (DEE) using LiTFSI and butadiene sulfone (BdS) for improved lithium metal battery compatibility. The electrolyte forms a stable LiF-rich SEI layer, enhancing battery lifespan and efficiency.

Keywords:
Butadiene sulfoneDeep eutectic electrolytesLi metal compatibilityLithium metal batteriesStable SEI

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Deep eutectic electrolytes (DEEs) offer unique properties for energy storage applications.
  • Achieving stable lithium (Li) metal anode compatibility in binary DEEs remains a significant challenge.
  • Current DEEs often face limitations in performance and safety for advanced battery designs.

Purpose of the Study:

  • To develop a nonflammable binary DEE with enhanced lithium metal anode compatibility.
  • To investigate the mechanism behind improved Li metal compatibility and its effect on battery performance.
  • To assess the universal applicability of the developed DEE strategy for other metal anodes.

Main Methods:

  • Formulation of a binary DEE using lithium bis(trifluoro-methane-sulfonyl)imide (LiTFSI) and solid butadiene sulfone (BdS).
  • Electrochemical characterization including ionic conductivity, Li+ ion migration number, and electrochemical window measurements.
  • Analysis of the solid electrolyte interphase (SEI) layer using experimental and theoretical methods.
  • Performance evaluation in Li||Li symmetric cells and Li||LiCoO2, Li||LiNi0.8Co0.1Mn0.1O2 full cells.

Main Results:

  • The LiTFSI-BdS DEE exhibits high ionic conductivity (1.48 mS·cm−1), Li+ migration number (0.52), and a wide electrochemical window (~4.5 V).
  • A LiF-rich SEI layer is formed due to BdS adsorption and deformation on the Li surface, promoting LiTFSI preferential reactions.
  • The stable SEI layer effectively suppresses Li dendrite growth and gas evolution, leading to long cycle life and high coulombic efficiency.
  • The BdS eutectic strategy demonstrates applicability to other metal anodes like Na and Zn.

Conclusions:

  • The developed nonflammable binary DEE based on LiTFSI and BdS significantly enhances lithium metal anode compatibility.
  • The formation of a protective LiF-rich SEI layer is crucial for stable cycling and improved battery performance.
  • This DEE strategy offers a promising approach for developing safer and more efficient next-generation batteries.