Dry-method multilayer composite electrode film, preparation method thereof, electrode plate and battery

By using a dry-process multilayer composite electrode film structure, the problems of low mechanical strength, poor electrolyte wettability, and weak resistance to volume change in the dry electrode process are solved, achieving efficient production and performance improvement of electrode sheets, which is suitable for battery manufacturing.

CN122117912APending Publication Date: 2026-05-29SICHUAN UNIV
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Patent Information

Application Number
CN202610269843.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-06
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Dry electrode processes suffer from problems such as low mechanical tensile strength, poor electrolyte wettability, and weak resistance to volume changes.

Method used

A dry-process multilayer composite electrode membrane structure is adopted, including an electrolyte induction layer, an active material layer, a structural layer, and a buffer layer. By introducing polar monomers, crosslinking agents, and high-strength polymer materials, the wettability and mechanical strength of the electrolyte are improved, and the buffer layer provides elastic protection.

Benefits of technology

It significantly improves the rate performance, tensile strength, and resistance to volume change of the electrode sheet, reduces production costs and energy consumption, and is suitable for large-scale industrial production.

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Abstract

The invention relates to the technical field of battery preparation, in particular to a dry-method multilayer composite electrode film, a preparation method thereof, an electrode plate and a battery. The dry-method multi-layer composite electrode film comprises an electrolyte induction layer, an active substance layer, a structural layer and a buffer layer, the electrolyte induction layer is formed by crosslinking a polar organic polymer with an organic matter film base material, and the electrolyte can better permeate into the electrode through the attraction of polar molecules to the electrolyte; the structural layer is supported by a high-strength organic film, so that the structure and tensile strength of the dry-method electrode self-supporting film are improved; the buffer layer is a thin film formed by an elastic organic polymer, and an elastic buffer layer is arranged for the multi-layer pole piece structure, so that a buffer effect is achieved when active substance particles are subjected to volume expansion and shrinkage, and PTFE fiber filamentous structure damage or pole piece structure damage caused by particle volume change is prevented. The problems that in the prior art, the mechanical tensile strength is low, electrolyte infiltration is poor, and the volume change resistance is weak are solved.
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