A pressure sensitive carbon coated current collector, a preparation method thereof and a lithium ion battery

By adding conductive carbon and pressure-sensitive binders with different particle sizes to the current collector of lithium-ion batteries, the problem of insufficient bonding between the current collector and the electrode slurry was solved, achieving tight bonding and efficient preparation at room temperature, and improving the cycle stability and conductivity of the battery.

CN122314902APending Publication Date: 2026-06-30SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
Filing Date
2024-12-31
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

The existing lithium-ion battery current collectors have insufficient adhesion to the electrode slurry, which affects the battery's cycle life and safety performance. In addition, the preparation process of carbon-coated current collectors is complex and costly.

Method used

A pressure-sensitive carbon-coated current collector is used, which includes a current collector foil and a conductive carbon layer. By using conductive carbon with different particle sizes and a pressure-sensitive binder, a tight bond between the electrode layer and the current collector is achieved at room temperature. This method is suitable for dry process fabrication of battery electrodes.

Benefits of technology

At room temperature, a tight bond between the electrode layer and the current collector was achieved, which improved the cycle stability and conductivity of the battery, simplified the fabrication process, and reduced costs.

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Abstract

This invention relates to a pressure-sensitive carbon-coated current collector, its preparation method, and a lithium-ion battery. The pressure-sensitive carbon-coated current collector includes a current collector foil and a conductive carbon layer located on at least one side of the current collector foil. The conductive carbon layer includes a pressure-sensitive binder, a first conductive carbon and a second conductive carbon with different particle sizes, and a dispersant. The conductive carbon layer of this invention, comprising a pressure-sensitive binder, a first conductive carbon, a second conductive carbon, and a dispersant, combines the pressure-sensitive binder with the first and second conductive carbons of different particle sizes. Under room temperature and rolling conditions, this significantly improves the adhesion between the dry electrode layer / electrode slurry coating and the current collector, achieving a tighter conductive contact between the current collector and the electrode layer. This is particularly suitable for preparing battery electrodes using dry processes. Electrodes prepared using the pressure-sensitive carbon-coated current collector can maintain a tight and durable conductive contact and stable electrochemical performance even after repeated electrochemical cycles.
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