Composite Foil Material and Method for Producing the Same, Composite Current Collector, Electrode Sheet, and Applications

The composite foil material with laser-etched metal layers on a polymer substrate addresses bonding issues in non-aqueous electrolyte secondary batteries, ensuring strong adhesion and efficient electron transport, thereby improving battery cycle stability and lifespan.

JP2025521959APending Publication Date: 2025-07-10YANGZHOU NANOPORE INNOVATIVE MATERIALS TECH LTD
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Patent Information

Application Number
JP2025500397
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-07-07
Filing Date
2022-09-02
Publication Date
2025-07-10

AI Technical Summary

Technical Problem

Conventional metal foil current collectors in non-aqueous electrolyte secondary batteries suffer from weak bonding with electrode active materials, leading to detachment during charge and discharge cycles, increased internal resistance, and reduced electron transport efficiency due to excessive contact resistance and complex adhesive application processes.

Method used

A composite foil material is manufactured with a polymer layer and opposing metal layers, subjected to laser etching to achieve uniform surface roughness and controlled thickness, enhancing adhesion and electron transport without adhesives, using processes like vacuum deposition and magnetron sputtering.

Benefits of technology

The composite foil material exhibits strong adhesion, low interfacial resistance, and improved electron transport, resulting in enhanced cycle stability and lifespan of non-aqueous electrolyte secondary batteries.

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Abstract

The present invention provides a method for manufacturing a composite foil material, including the steps of: providing a polymer layer including opposing first and second surfaces; forming a first metal layer on the first surface of the polymer layer and a second metal layer on the second surface of the polymer layer; and performing laser etching on the first and second metal layers until the surface roughness of the first metal layer becomes 0.4 to 0.8 μm and the surface roughness of the second metal layer becomes 0.4 to 0.8 μm. The present invention further relates to a composite current collector of the composite foil material, which has low interfacial resistance, excellent current performance, excellent mechanical properties, and can be used in the manufacture of non-aqueous electrolyte secondary batteries.
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Citation Information

Patent Citations

  • Preparation method of negative electrode composite current collector and product prepared by preparation method

    CN114678534A

  • Cathode current collector with composite structure and energy storage device

    CN211957791U

  • Non-aqueous electrolyte secondary battery

    JP2022100811A