Positive electrode sheet and battery

By employing a three-dimensional network framework structure and carbon nanotubes with different aspect ratios in the positive electrode, the problem of easy breakage of thick electrode sheets is solved, improving the safety and cycle performance of the battery, as well as increasing energy density and production efficiency.

WO2026119207A1 Publication Date: 2026-06-11ZHUHAI COSMX BATTERY CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ZHUHAI COSMX BATTERY CO LTD
Filing Date
2025-12-03
Publication Date
2026-06-11

AI Technical Summary

⚠Technical Problem

Existing lithium-ion battery cathode sheets are prone to breakage when the thickness increases, affecting battery safety and cycle performance, and the lithium insertion/extraction rate of the cathode active material is relatively slow.

⚗Method used

The positive electrode sheet adopts a three-dimensional network skeleton structure. It utilizes a conductive binder formed by carbon nanotubes and a bonding layer, combined with carbon nanotubes of different aspect ratios, to improve the cohesion and conductivity of the positive electrode active material, satisfying the relationship H×B≤35 to ensure adhesion and cohesion.

🎯Benefits of technology

It improves the fracture toughness of the positive electrode, enhances the safety and cycle performance of the battery, increases the energy density and rate discharge performance of the battery, and simplifies the production process.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present disclosure relates to the technical field of batteries, and specifically relates to a positive electrode sheet and a battery. The positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer located on one or two side surfaces of the positive electrode current collector, wherein the positive electrode active material layer comprises a three-dimensional network framework and a positive electrode active material filled in the three-dimensional network framework; the three-dimensional network framework is formed by an electrically conductive binder; and the electrically conductive binder comprises carbon nanotubes and a bonding layer located on at least part of the surfaces of the carbon nanotubes. The positive electrode sheet satisfies the relational expression: 2≤H×B≤35, wherein H is the thickness of the bonding layer, and B is the average particle size of the positive electrode active material. The positive electrode active material in the positive electrode sheet of the present disclosure exhibits good internal cohesion, which can significantly enhance the fracture toughness of a thick electrode sheet; moreover, the material exhibits a faster lithium intercalation / deintercalation rate, which can significantly improve the safety performance of a battery and enhance the capacity retention rate thereof in the later stage of cycling.
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