Electro-polymerization conductive polymer modified aluminum current collector and preparation method and application thereof

By constructing a conductive polymer coating on the surface of aluminum foil, the interfacial compatibility problem between aluminum foil and positive electrode active material is solved, improving the rate performance and cycle stability of the battery and reducing the rate of increase in battery internal resistance.

CN122291385APending Publication Date: 2026-06-26GUIZHOU UNIV +1
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Patent Information

Application Number
CN202610467484.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-10
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Traditional aluminum foil has a smooth and flat surface, which results in poor interfacial compatibility with the positive electrode active material slurry, leading to high interfacial contact resistance, affecting the battery's rate performance, and it is also prone to corrosion during long-term charging and discharging, which may cause internal short circuits in the battery.

Method used

A conductive polymer coating is constructed in situ on the surface of aluminum foil using a constant current or constant voltage anodic oxidation electrochemical polymerization method, forming a honeycomb nanostructure that enhances the interfacial bonding strength and blocks corrosive ions.

Benefits of technology

It reduces contact resistance, improves battery rate performance and cycle stability, slows down aluminum foil corrosion, and maintains battery structural integrity.

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Abstract

The invention provides an electro-polymerization conductive polymer modified aluminum current collector and a preparation method and application thereof, relates to the technical field of aluminum foil current collectors, and mainly solves the interface problem between the current collector and an active material and improves the performance of a lithium ion battery through a current collector surface modification mode. An aluminum foil current collector is used as an anode, a graphite plate is used as a cathode, an acid solution of a conductive polymer monomer is used as an electrolyte, anodic oxidation electropolymerization, washing and drying are carried out in a constant current or constant voltage mode, and an electropolymerization conductive polymer modified aluminum current collector is obtained; the conductive polymer monomer is at least one of aniline, thiophene and pyrrole; the concentration of the conductive polymer monomer in the electrolyte is 0.1-1.0 mol / L; the polymerization time is 5 to 10 minutes. According to the invention, the contact resistance between the current collector and the active substance is effectively reduced, the bonding strength of the coating and the substrate and the corrosion resistance of the current collector are improved, and the application prospect is good.
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