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Updated: Jun 19, 2025
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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
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A Highly Stable and Non-Flammable Deep Eutectic Electrolyte for High-Performance Lithium Metal Batteries
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P.R. China.
Angewandte Chemie (International Ed. in English)
|July 26, 2024
Summary
A novel dimethylmalononitrile (DMMN)-based deep eutectic electrolyte (DEE) enhances lithium metal battery performance. This DMMN-based DEE offers improved electrode interface compatibility, stability, and nonflammability for next-generation batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Deep eutectic electrolytes (DEEs) show promise for lithium metal batteries (LMBs) but face challenges with electrode interface compatibility.
- Existing liquid and solid electrolytes have limitations in promoting LMB performance and safety.
Purpose of the Study:
- To develop a novel solid dimethylmalononitrile (DMMN)-based DEE for improved LMBs.
- To address the electrode interface compatibility issues in LMBs using DEEs.
Main Methods:
- Synthesized a novel DMMN-based DEE by coordinating N with LiTFSI to promote LiTFSI dissociation.
- Investigated the interaction between DMMN, Li+, and TFSI- to form the DEE.
- Evaluated the electrochemical stability and interfacial properties of the DMMN-based DEE.
Main Results:
- The DMMN molecule effectively dissociates LiTFSI through N coordination and hydrogen bonding.
- DMMN exhibits enhanced reduction stability with lithium metal due to the absence of active α-hydrogen, ensuring favorable interfacial compatibility.
- Polymer electrolytes based on this DEE demonstrated high ionic conductivity (0.67 mS cm⁻¹ at 25°C), high oxidation voltage (5.0 V vs. Li+/Li), and nonflammability.
- Li‖LFP and Li‖NCM811 full batteries using this DEE polymer electrolyte showed excellent long-term cycling stability and high-rate performance.
Conclusions:
- The novel DMMN-based DEE overcomes traditional electrolyte limitations in electrode interface compatibility for LMBs.
- This DMMN-based DEE opens new avenues for enhancing the performance and safety of lithium metal batteries.
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