Method for preparing a composite current collector for a battery and use thereof

By pretreating polyester fiber films and depositing copper oxide graphene, combined with modified nano-silicon fillers and flame-retardant filler microspheres, the problems of poor mechanical properties and insufficient flame-retardant properties of copper current collectors are solved, and a composite current collector for batteries with high strength, good conductivity and flame-retardant properties is realized.

CN117525434BActive Publication Date: 2026-07-24JIANGYIN NANOPORE INNOVATIVE MATERIALS TECH LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGYIN NANOPORE INNOVATIVE MATERIALS TECH LTD
Filing Date
2023-12-13
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing copper current collectors have poor mechanical properties and low elongation. Traditional flame retardant particles are too large, resulting in excessively thick coatings that hinder Li+ transport, making it impossible to achieve both lightweight and flame retardant properties simultaneously.

Method used

By pretreating the polyester fiber film, copper plating and graphene oxide deposition are performed, and then modified nano-silicon filler and flame-retardant filler microspheres are coated on the surface. Crosslinking agents are used to improve the bonding force and dispersibility, forming a spontaneous polymer protective layer and an SEI layer.

Benefits of technology

It improves the mechanical strength, electrical conductivity and flame retardant properties of the current collector, enhances the interfacial stability and electrochemical performance, and resolves the contradiction between lightweighting and flame retardancy.

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Abstract

The application relates to the technical field of current collectors, and discloses a preparation method of a composite current collector for a battery and application of the composite current collector. The preparation method of the composite current collector for the battery comprises the following steps: S1, pretreating and activating a polyester fiber film for standby; S2, placing the activated polyester fiber film into a copper plating solution at 45-50 DEG C, oscillating and reacting for 25-30 min, washing, drying, and obtaining a copper-plated polyester fiber film; S3, depositing reduced graphene oxide on the surface of the copper-plated polyester fiber film through electrochemical reduction to obtain a graphene copper-plated polyester fiber film; and S4, adding modified nano silicon fillers, flame-retardant filler microspheres and a crosslinking agent into N-methylpyrrolidone, uniformly stirring, coating the surface of the graphene copper-plated polyester fiber film, and drying to obtain the composite current collector for the battery.
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Citation Information

Patent Citations

  • CN106009383A

  • CN110085869A