Electrode sheets for lithium-ion secondary batteries

TWI940614BActive Publication Date: 2026-10-01TEIJIN LTD
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Patent Information

Application Number
TW111120102
Authority / Receiving Office
TW · TW
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-05-31
Filing Date
2022-05-30
Publication Date
2026-10-01
Estimated Expiration
2042-05-29

AI Technical Summary

Technical Problem

Existing electrode sheets for lithium ion secondary batteries require solvents in the manufacturing process, leading to complex production steps and potential cracking during drying, and fibrous carbon alignment causes anisotropy in mechanical strength.

Method used

An electrode sheet composed of fibrous carbon and a fluorine-based polymer binder, eliminating the need for solvents and ensuring the sheet's integrity through entangled fibrillated fluoropolymers and fibrous carbon, maintaining a thickness of 50-2000 μm and tensile breaking strength above 0.20 N/mm².

Benefits of technology

The solution simplifies manufacturing, enhances mechanical strength, and maintains high conductivity and electron/ion conductivity, reducing anisotropy and enabling high energy density applications.

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Abstract

According to the present invention, an electrode sheet for lithium-ion secondary batteries is provided, characterized in that it contains at least an active material for lithium-ion batteries, fibrous carbon, and a fluorinated polymer, wherein the electrode sheet for lithium-ion secondary batteries has a film thickness of 50 to 2000 μm and a tensile breaking strength of 0.2 N / mm² or higher, the fibrous carbon has an average fiber diameter of 100 to 900 nm, and the content of the fibrous carbon in the electrode sheet is 0.1 to 10% by mass.
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Citation Information

Patent Citations

  • Lithium ion secondary battery

    CN112335092A