A composite current collector and its preparation method, electrode and battery

A porous conductive substrate was prepared by differential roller stretching process to form a conductive layer, and a three-dimensional network conductive system was constructed. This solved the performance contradiction between lightweight and conductivity in composite current collectors, and achieved a synergistic improvement in high mechanical strength and low electrode resistivity, thereby improving the energy density and cycle stability of lithium-ion batteries.

CN122091599APending Publication Date: 2026-05-26安徽得壹能源科技有限公司
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Patent Information

Application Number
CN202610047254.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-14
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing composite current collectors, while reducing weight, struggle to achieve a synergistic optimization of high conductivity and high mechanical strength. Furthermore, their fabrication processes are complex and costly, impacting battery performance and processing yield.

Method used

A porous conductive matrix was prepared by differential roller stretching process, and a conductive layer was formed on its surface to construct a three-dimensional network conductive system. Combined with the synergistic structure of polymer and conductive filler, a gradient conductive network was formed.

Benefits of technology

It achieves a synergistic improvement in lightweight, high conductivity and high mechanical strength, optimizes electron and ion transport paths, improves battery safety and cycle stability, reduces electrode resistivity, and improves energy density and cycle stability.

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Abstract

This invention discloses a composite current collector, its preparation method, an electrode, and a battery, belonging to the field of lithium-ion battery technology. The composite current collector provided by this invention includes: a porous conductive matrix comprising a polymer and a first conductive filler dispersed in the polymer, prepared by differential roller stretching; a conductive layer disposed on at least one surface of the porous conductive matrix; and the conductive layer comprising a second conductive filler and a binder. The composite current collector of this invention achieves a significant reduction in electrode resistivity while maintaining excellent mechanical properties, effectively resolving the performance contradiction between lightweight and conductivity in traditional composite current collectors. The assembled lithium-ion battery exhibits high energy density, high cycle stability, and high safety.
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