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Related Experiment Video

Updated: Sep 12, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Lithium-Bond-Based Deep Eutectic Electrolyte Solutions for High-Temperature Lithium Metal Batteries.

Xiaosheng Song1,2, Yi Zhang1, Zhijie Guo1,3

  • 1Key Laboratory for Special Functional Materials of Ministry of Education, School of Nanoscience and Materials Engineering, Henan University, Kaifeng, 475004, P.R. China.

Angewandte Chemie (International Ed. in English)
|August 11, 2025
PubMed
Summary

Researchers developed a novel Li-bond deep eutectic electrolyte (Li-DEE) for high-temperature lithium metal batteries (LMBs). This Li-DEE enhances ion transport and interfacial stability, enabling long-term cycling performance.

Keywords:
Deep eutectic electrolyteLithium metalLi‐bondLong‐term stabilityWide‐temperature

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-temperature lithium metal batteries (LMBs) require stable interfaces and efficient ion transport for long-term cycling.
  • Conventional electrolytes face limitations due to molecular polarity and strong ionic interactions, hindering performance.

Purpose of the Study:

  • To develop a novel electrolyte for high-temperature LMBs that overcomes the limitations of conventional systems.
  • To investigate the potential of a Li-bond deep eutectic electrolyte (Li-DEE) for improved battery performance.

Main Methods:

  • Synthesized a Li-DEE using tetraethylammonium nitrate and lithium bis(fluorosulfonyl)imide.
  • Characterized the Li-DEE's ionic conductivity and interfacial properties at elevated temperatures.
  • Evaluated the cycling stability and capacity retention of LMBs utilizing the Li-DEE.

Main Results:

  • The Li-DEE exhibited rapid lithium-ion transport (6.5 × 10-3 S cm-1 at 100 °C).
  • A stable electrode interface, rich in Li3N and LiF, was formed.
  • The LMB demonstrated 80% capacity retention over 635 cycles at 0.5 C and 84.4 mAh g-1 after 1500 cycles at 2 C and 100 °C.

Conclusions:

  • The Li-bond network in Li-DEE facilitates efficient ion transport and robust interfacial stability.
  • Li-DEE is a promising electrolyte for high-temperature lithium metal batteries.
  • This research offers insights for designing advanced electrolytes for extreme operating conditions.