Deep Eutectic Electrolytes for Lithium Metal Batteries: A Review.

Area of Science:

• Electrochemistry and Materials Science
• Energy Storage Technologies

Background:

• Deep eutectic electrolytes (DEEs) are emerging as advanced materials for lithium metal batteries (LMBs).
• DEEs offer high ionic conductivity, thermal stability, flame retardance, and a wide electrochemical stability window.
• Current understanding of DEEs in LMBs requires further in-depth investigation.

Purpose of the Study:

• To systematically review the formation, classification, properties, and applications of DEEs in both liquid and solid-state LMBs.
• To highlight the advantages of DEEs in improving ionic conduction, interfacial stability, flame retardance, and overall battery safety.
• To propose future research directions for overcoming limitations and advancing DEE applications in high-energy-density LMBs.

Main Methods:

• Systematic literature review and analysis of DEEs in lithium metal batteries.
• Examination of DEE formation mechanisms, fundamental properties, and classification.
• Evaluation of DEE applications in liquid and solid-state battery systems.

Main Results:

• DEEs demonstrate significant potential in addressing critical challenges in LMBs, including ionic conduction and interfacial stabilization.
• The intrinsic flame retardance and thermal stability of DEEs contribute to enhanced battery safety.
• DEEs show promise for both liquid and solid-state LMB applications, offering a viable alternative to conventional electrolytes.

Conclusions:

• Deep eutectic electrolytes are a promising class of materials for next-generation lithium metal batteries.
• Further research into DEEs is crucial for unlocking their full potential in high-safe and high-energy-density energy storage.
• DEEs represent a key advancement in overcoming the limitations of conventional electrolytes for practical battery applications.