Current collector with chemically active interface layer and preparation method and application thereof

By introducing cyano and amide functional groups onto the surface of the current collector substrate, an ultrathin chemically active interface layer is constructed, which solves the problem of weak interfacial bonding caused by volume expansion and contraction of silicon-based anode materials in lithium-ion batteries, thereby improving the cycle life and electrochemical performance of the battery.

CN121769113APending Publication Date: 2026-03-31深圳耀石锂电科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-26
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

In existing technologies, silicon-based anode materials in lithium-ion batteries have weak interfacial bonding due to volume expansion and contraction, leading to a sharp drop in battery capacity and the termination of cycle life. Existing methods, such as carbon coating current collectors, are costly and increase the amount of binder, sacrificing energy density, and have failed to fundamentally solve the problem of weak interfacial chemical bonding.

Method used

By introducing activating functional groups such as cyano and amide groups onto the surface of the current collector substrate, and constructing an ultrathin chemically active interface layer using a polymer containing amine groups, a strong chemical anchoring is achieved, forming a robust chemical cross-linking network with the binder in the electrode slurry, thereby enhancing the interfacial bonding strength.

Benefits of technology

It effectively suppressed the demolding problem of silicon-based anodes during cycling, improved the cycle life and initial coulombic efficiency of the battery, reduced active material shedding and repeated rupture of the SEI film, and enhanced the overall performance of the battery.

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Abstract

The invention provides a current collector with a chemical activity interface layer. The current collector comprises a base material and the chemical activity interface layer on the surface of the base material, the substrate has activating functional groups bonded to the chemically active interface layer, the activating functional groups including cyano and amido functional groups, and the chemically active interface layer including an amine group-containing polymer. According to the invention, plasma is adopted to activate the substrate, and high-density cyano and acylamino functional groups are introduced; a catecholamine polymer precursor or an imide polymer precursor containing an ether oxygen group is uniformly conveyed to an activated surface through an atomization technology, and an ultrathin and compact interface layer which is strongly chemically bonded with a base material is constructed through a chemical reaction. The interface layer can further form chemical crosslinking with a binder in the electrode slurry, and traditional physical adhesion is converted into a physical-chemical dual anchoring mode, so that the interface peel strength is greatly improved, the problem of'demolding 'of the silicon-based negative electrode in the cycle process is solved, and the cycle life and the electrochemical performance of the battery are remarkably improved.
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