A mxene aerogel separator and a preparation process thereof

By combining modified carboxymethyl cellulose with MXene nanosheets, a cross-linked MXene aerogel membrane was prepared, which solved the problem of polysulfide dissolution and migration in lithium-sulfur batteries, achieved efficient ion transport and mechanical strength, and improved battery performance.

CN122118299APending Publication Date: 2026-05-29WEIWEI (GUANGDONG) NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WEIWEI (GUANGDONG) NEW MATERIAL TECHNOLOGY CO LTD
Filing Date
2026-03-10
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The shuttle effect caused by the dissolution and migration of polysulfides in existing lithium-sulfur batteries leads to the loss of active sulfur, slow reaction kinetics, reduced coulombic efficiency, and intensified side reactions on the lithium metal surface. Traditional dense separators cannot simultaneously meet the requirements of high ionic conductivity, high mechanical strength, and high electrolyte holding capacity.

Method used

By combining modified carboxymethyl cellulose with MXene nanosheets, cross-linked MXene aerogel membranes were prepared using directional cryogenic casting technology to form a three-dimensional interpenetrating network structure. This structure, combined with chemical adsorption and physical barrier mechanisms, inhibited polysulfide diffusion and optimized ion transport channels.

Benefits of technology

It significantly improves the mechanical strength, thermal stability and ion transport efficiency of the separator, reduces the internal resistance of the battery, enhances the rate performance and energy density of the battery, and prevents the risk of battery thermal runaway.

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Abstract

The application discloses an MXene aerogel diaphragm and a preparation process thereof, and belongs to the technical field of lithium battery diaphragms. The MXene aerogel diaphragm disclosed by the application contains the following components in parts by weight: 100 parts of modified carboxymethyl cellulose, 5-15 parts of MXene nanosheets, 20-30 parts of a crosslinking agent, 0.1-100 parts of a pH regulator, and 10000-20000 parts of a solvent. The modified carboxymethyl cellulose is prepared by first subjecting sodium carboxymethyl cellulose to a nucleophilic ring-opening reaction with glycidyl methacrylate to obtain GMA-CMC, and then subjecting the GMA-CMC to a Michael addition with 2-amino-4-(trifluoromethyl) pyridine hydrochloride. The MXene aerogel diaphragm disclosed by the application has excellent structural stability, high ionic conductivity and good thermal stability.
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