Related Experiment Video
Updated: Jun 22, 2025
11:04
Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
13.0K
All-Fluorinated Electrolyte Engineering Enables Practical Wide-Temperature-Range Lithium Metal Batteries
Liwei Dong1, Dan Luo2, Bowen Zhang3
1MOE Engineering Research Center for Electrochemical Energy Storage and Carbon Neutrality in Cold Regions, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150080, China.
ACS Nano
|July 2, 2024
Summary
Researchers developed a new all-fluorinated electrolyte for lithium metal batteries (LMBs) that operates effectively across a wide temperature range of -50 °C to 110 °C, improving battery stability and performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal batteries (LMBs) face challenges with limited operating temperature windows due to electrolyte instability.
- Uncontrolled side reactions and unstable electrolyte/electrode interfaces (EEI) hinder LMB performance at extreme temperatures.
- Sluggish desolvation kinetics further limit the operational range of conventional LMB electrolytes.
Purpose of the Study:
- To develop a novel electrolyte enabling stable and efficient operation of LMBs across a wide temperature range.
- To investigate the impact of an all-fluorinated electrolyte on solvation structure and EEI formation.
- To enhance the practical performance and safety of LMBs for diverse applications.
Main Methods:
- Formulation of an all-fluorinated electrolyte using lithium bis(trifluoromethane sulfonyl)imide, hexafluorobenzene (HFB), and fluoroethylene carbonate.
- Characterization of the electrolyte's solvation structure and its effect on the electrolyte/electrode interface (EEI).
- Electrochemical testing of LMBs under wide temperature conditions (-50 °C to 110 °C), including cycling performance and energy density measurements.
Main Results:
- The all-fluorinated electrolyte demonstrated effective solvation structure regulation for operation between -50 °C and 110 °C.
- Introduction of HFB led to an EEI with a high LiF content (93%), suppressing side reactions and gas generation.
- Achieved 88.3% capacity retention after 400 cycles at 90 °C and improved cycling at -50 °C.
- Practical pouch cells exhibited high energy densities of 307.13 Wh kg⁻¹ at 60 °C and 277.99 Wh kg⁻¹ at -30 °C.
Conclusions:
- The developed all-fluorinated electrolyte provides a viable strategy for wide-temperature-range electrolyte design in LMBs.
- The HFB-containing electrolyte enhances interfacial stability and ion transport at extreme temperatures.
- This advancement promotes the practical application and commercialization of high-performance lithium metal batteries.
