Non-combustible deep eutectic electrolyte based on LiTFSI-NMF-FEC and preparation method of lithium metal battery

By optimizing the SEI layer structure using the LiTFSI-NMF-FEC electrolyte system, the problems of lithium dendrite growth and flammability in lithium metal batteries are solved, achieving efficient lithium-ion transport and safety, making it suitable for portable electronic devices, electric vehicles and large-scale energy storage systems.

CN121862884APending Publication Date: 2026-04-14JIANGSU HIGHSTAR BATTERY MFG CO LTD +2
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Patent Information

Application Number
CN202512014088.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-29
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

Existing lithium metal batteries suffer from defects such as lithium dendrite growth, unstable SEI layer, low coulombic efficiency, and flammability, which limit their commercial application.

Method used

The non-flammable deep eutectic electrolyte system of LiTFSI-NMF-FEC is adopted. LiTFSI and NMF form a deep eutectic substrate, and FEC is added as an SEI regulating additive to optimize the SEI layer structure, suppress lithium dendrite growth and improve ionic conductivity and safety.

Benefits of technology

It achieves low viscosity, high ionic conductivity and inherent non-flammability, significantly improving battery cycle stability and safety. The initial discharge capacity and post-cycle capacity retention are significantly better than traditional electrolytes, making it suitable for industrial applications.

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Abstract

The invention provides a preparation method of a non-combustible deep eutectic electrolyte based on LiTFSI-NMF-FEC and a lithium metal battery, and the preparation method comprises the following steps: S1, taking lithium bis (trifluoromethanesulfonimide) (LiTFSI) as a lithium salt and N-methylformamide (NMF) as a hydrogen bond donor, accurately weighing LiTFSI and NMF according to a molar ratio of 1: 4, placing the LiTFSI and NMF in a polytetrafluoroethylene sealed container which is subjected to vacuum drying at 120 DEG C for 8 hours, and in a constant-temperature water bath at 80 + / -2 DEG C, carrying out vacuum drying at 120 DEG C for 8 hours; stirring for 12 + / -1h at 400 + / -50rpm, sampling and observing every 2h during the period to ensure that the system is clear, transparent and free of precipitates, and naturally cooling to 25 + / -2 DEG C to obtain a deep eutectic substrate solution; s2, using fluoroethylene carbonate (FEC) as an SEI regulation and control additive, slowly adding the SEI regulation and control additive into the deep eutectic substrate liquid according to the proportion of 5wt% of the total mass of the electrolyte, stirring at 250 + / -30rpm for 3 + / -0.5 h to ensure that the FEC is uniformly dispersed, and standing for 1.5 + / -0.5 h to remove tiny bubbles, so as to obtain uniform deep eutectic electrolyte slurry; and S3, the deep eutectic electrolyte slurry is subjected to battery assembly in an argon glove box, and the lithium metal battery carrying the target electrolyte is obtained through assembly.
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