Method for recovering lithium bis-trifluoromethanesulfonimide and polymer in lithium battery polymer electrolyte and application thereof

The method of recovering LiTFSI and PEO from lithium batteries by means of thermal decomposition-assisted method solves the separation problem caused by the close decomposition temperature in the existing technology, realizes efficient and low-cost resource recovery and reuse, and is applicable to the preparation of solid-state lithium battery electrode and electrolyte materials.

CN117276729BActive Publication Date: 2026-06-16SHAOXING DONGYUAN NEW MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHAOXING DONGYUAN NEW MATERIAL TECH CO LTD
Filing Date
2022-06-15
Publication Date
2026-06-16

AI Technical Summary

⚠Technical Problem

Existing technologies struggle to efficiently recover lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) from lithium-ion batteries, especially since its decomposition temperature is close to that of the polymer matrix, making separation difficult. Furthermore, the preparation process of LiTFSI is complex, costly, and environmentally damaging.

⚗Method used

A thermal decomposition-assisted method is used to recover LiTFSI from the polymer electrolyte through steps such as heating and dissolving in an organic solvent, cooling and precipitation, solid-liquid separation, thermal pyrolysis and multiple solvent washing. Polyethylene oxide (PEO) is selectively recovered and thermally pyrolyzed under a protective atmosphere, using a catalyst to reduce the temperature.

🎯Benefits of technology

It achieves high-purity and high-recovery-rate LiTFSI and PEO recovery, reduces recycling costs, is suitable for large-scale industrial production, improves resource reuse rate, reduces environmental pollution and carbon emissions, and brings economic benefits.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application belongs to the technical field of recovery and recycling of lithium salt in polymer electrolyte in solid-state lithium battery, and specifically discloses a method for recovering lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in polymer electrolyte or simultaneously recovering polymer by means of thermal decomposition and application thereof, which comprises the following steps: firstly, recovering the polymer in PEO electrolyte to obtain PEO and distillation residue; performing thermal cracking on the distillation residue and / or polymer electrolyte in a protective atmosphere to obtain a thermal cracking product; and performing multiple purifications on the thermal cracking product to obtain LiTFSI solid. The application first proposes a method for recovering LiTFSI in polymer electrolyte or simultaneously recovering polymer by means of thermal decomposition, and the process flow is simple, the recovery cost is low, and the method is suitable for large-scale industrial production. In addition, the recovered sample has high purity and can be applied in the preparation of solid-state lithium battery electrodes and electrolyte materials, and the resource recycling rate is improved to a certain extent.
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