Diaphragm and preparation method thereof, lithium ion battery and electric device

By designing a layout of protrusions and recesses on the lithium-ion battery separator, encapsulating lithium replenishment material, and precisely controlling its release through through-holes, the problems of lithium-ion battery capacity decay and lithium replenishment material shedding are solved, achieving high safety and long lifespan lithium-ion battery performance.

CN122267437APending Publication Date: 2026-06-23JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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Patent Information

Application Number
CN202610243073.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-28
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

During the formation process, lithium-ion batteries consume a large amount of active lithium to form an SEI film, which leads to capacity decay. Furthermore, the lithium replenishment material coated on the separator is prone to falling off during the cyclic expansion-contraction process.

Method used

Design a separator with raised structures and recesses on a base membrane, placing a lithium replenishment material in the recesses, coating it with a coating to encapsulate the lithium replenishment material, and providing through holes on the raised structures to achieve precise controlled release of the lithium replenishment material.

Benefits of technology

It significantly reduces the risk of lithium replenishment material shedding, improves the cycle life and safety of lithium-ion batteries, suppresses lithium loss through a dual storage mechanism, optimizes the lithium-ion transport path, and enhances electrolyte distribution and thermal stability.

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Abstract

The invention relates to a diaphragm and a preparation method thereof, a lithium ion battery and an electric device. The diaphragm comprises a base membrane, a lithium supplementing material and a coating. The base film is provided with a first surface and a second surface which are opposite to each other in the thickness direction, the first surface is provided with protruding structures, the protruding structures are provided with through holes, the surface, right opposite to the protruding structures, of the second surface is provided with concave portions, the through holes are communicated with the concave portions, the inner diameter of the concave portions on the second surface is larger than the hole diameter of the through holes, and the number of the protruding structures is multiple. The plurality of convex structures are arranged at intervals; the lithium supplementing material is positioned in the concave part; the coating is coated on the second surface and covers the recess. The diaphragm has the functions of liquid retention and lithium supplementation, and not only can restrain the capacity attenuation of the lithium ion battery, but also can reduce the falling risk of the lithium supplementation material.
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