Negative electrode protective film based on cof material and preparation method and application thereof

By preparing a negative electrode protective film by combining COF material with flexible polymer, the problems of interface failure and lithium dendrite formation between silicon-based and lithium metal negative electrodes in lithium batteries are solved, thereby improving the stability and safety of high-energy-density lithium batteries and making them suitable for industrial production.

CN122417890APending Publication Date: 2026-07-17NINGBO JIERONG NEW MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-19
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Traditional graphite anodes are difficult to meet the requirements of high energy density. Silicon-based and lithium metal anodes in lithium batteries face problems such as interface failure, interface instability and lithium dendrite growth. Existing protection strategies have shortcomings such as poor mechanical properties, poor film formation, weak ion transport regulation ability and complex preparation process.

Method used

A COF-based negative electrode protective film is used. Through the synergistic design of a rigid COF framework and a flexible polymer matrix, a continuous protective film is prepared. By utilizing the regular channels of COF and the flexibility of the polymer, combined with direct coating/thermal transfer printing process, the protective film achieves a balance between rigidity and flexibility, regulates interfacial ion transport, inhibits lithium dendrite growth, and alleviates volume expansion.

Benefits of technology

It improves the mechanical strength, ionic conductivity and interface stability of lithium batteries, inhibits lithium dendrite growth, extends cycle life, improves battery safety and capacity retention, and is suitable for industrial production.

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Abstract

本公开涉及电化学电池技术领域，特别是基于COF材料的负极保护膜及其制备方法与应用。所述保护膜为三嗪类COF、聚合物与锂盐的复合膜，其中COF颗粒分散于聚合物基体。本公开的保护膜刚柔并济，可调控界面离子传输、抑制锂枝晶生长、缓解负极体积膨胀，显著提升锂电池循环稳定性与安全性，适用于液态、半固态及全固态锂电池。
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Citation Information

Patent Citations

  • Preparation method of flexible protection layer for lithium metal negative electrode protection

    CN119640588A