Composite current collector and preparation method thereof, electrode plate, battery and power utilization device

By introducing hydrolytic stabilizers, fillers, and compatibilizers into the polyester matrix layer, the problems of hydrolytic degradation and interlayer delamination of composite current collectors under high temperature and high humidity environments are solved, thereby improving mechanical properties and simplifying the process.

CN121601675APending Publication Date: 2026-03-03JIANGSU ENPACK COMPOSITE CURRENT COLLECTORS CO LTD
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Patent Information

Application Number
CN202511764403.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-27
Publication Date
2026-03-03

AI Technical Summary

Technical Problem

Traditional composite current collectors are prone to hydrolytic degradation and interlayer delamination in high-temperature and high-humidity electrolyte environments, leading to decreased mechanical properties and battery safety hazards. In addition, the process is complex and costly.

Method used

Hydrolytic stabilizers, fillers, and compatibilizers are introduced into the polyester matrix layer to form a synergistic system. Through chemical inhibition of hydrolysis, physical barrier to penetration, and interfacial reinforcement, the mechanical strength and interfacial bonding of the polyester matrix layer are improved.

Benefits of technology

It maintains excellent mechanical strength and stable interface structure under long-term electrolyte immersion, extends service life, reduces the risk of interlayer delamination, simplifies the process and reduces costs.

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Abstract

The invention relates to the technical field of composite current collectors, in particular to a composite current collector and a preparation method thereof, an electrode plate, a battery and an electric device, and the composite current collector comprises a polyester matrix layer and a conductive layer arranged on at least one surface of the polyester matrix layer; the polyester matrix layer is prepared from the following components in parts by mass: 40 to 65 parts of polyester, 20 to 50 parts of metal material, 5 to 15 parts of filler, 3 to 8 parts of compatilizer, 0.5 to 3 parts of hydrolysis stabilizer and 0.1 to 1 part of antioxidant; the hydrolysis stabilizer comprises an oligomer containing an epoxy group and an oligomer containing a carbodiimide group. According to the composite current collector provided by the invention, the binding force between the base material and the conductive layer is improved, the hydrolytic degradation process of the polyester matrix layer in an electrolyte environment is inhibited, and the mechanical property of the composite current collector is improved.
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