Surface-treated copper foil for lithium-ion secondary battery, current collector, and lithium-ion secondary battery

A surface-treated copper foil with controlled nickel deposition and surface properties addresses cracking and corrosion issues, enhancing the performance of lithium-ion secondary batteries with sulfide solid electrolytes.

JP2025146651AActive Publication Date: 2025-10-03CHANG CHUN PETROCHEMICAL CO LTD
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Patent Information

Application Number
JP2024221797
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-10-08
Filing Date
2024-12-18
Publication Date
2025-10-03
Estimated Expiration
2044-12-18

AI Technical Summary

Technical Problem

Lithium-ion secondary batteries face challenges with sulfide solid electrolytes due to copper sulfide formation, increasing internal resistance and safety concerns, and nickel-plated copper foils are prone to cracking during manufacturing, compromising corrosion resistance and electrical conductivity.

Method used

A surface-treated copper foil with controlled nickel deposition (3.0 × 10^4 to 21.5 × 10^4 μg/dm²) and specific surface properties (chromaticity L* 30 to 60, protruding valley depth Svk 0.10 to 0.65 μm) to enhance corrosion resistance and flexibility, preventing cracks and maintaining conductivity.

Benefits of technology

The treated copper foil achieves improved corrosion resistance, reduced cracking, and maintains electrical conductivity, suitable for all-solid-state batteries, ensuring stable battery performance.

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Abstract

To provide a surface-treated copper foil for a lithium ion secondary battery, a current collector for the lithium ion secondary battery, and a lithium ion secondary battery.SOLUTION: A surface-treated copper foil for a lithium-ion secondary battery includes a copper layer having a first surface and an opposite second surface, and nickel-containing treatment layers disposed on the first and second surfaces of the copper layer, and each treatment layer has a nickel coating weight of 3.0×104 μg / dm2 or more, and each treatment layer provides a treated surface, and the treated surface has a chromaticity L* value of 30 to 60 and a protruding valley depth Svk of 0.10 to 0.65 μm.SELECTED DRAWING: Figure 2-2
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