Preparation method of high-load aqueous positive electrode sheet and high-load aqueous positive electrode sheet

By modifying aluminum foil, combining aqueous binders, and using a stepwise drying process, the interfacial bonding force and structural stability of lithium (sodium) battery cathode sheets were solved, and the flexibility and cycle performance of high-load aqueous cathode sheets were improved, making them suitable for large-scale industrial production.

CN122246068APending Publication Date: 2026-06-19UNIV OF SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF SCI & TECH OF CHINA
Filing Date
2026-03-27
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In the current preparation of lithium (sodium) battery positive electrode sheets, the bonding force between the aluminum foil current collector and the aqueous slurry is weak, and it is easy to fall off under high load. The active material is prone to water absorption, which leads to structural damage. Traditional drying processes are prone to generating bubbles and cracks, affecting the integrity and performance stability of the electrode sheet.

Method used

A high-load aqueous positive electrode sheet is prepared by using aluminum foil surface modification treatment, aqueous binder combination and step-by-step drying process. A nano-alumina layer is formed on the aluminum foil surface, a mixture of polyacrylic acid and sodium carboxymethyl cellulose or sodium alginate is used as binder, and a drying method combining low-temperature slow baking and high-temperature fast baking is adopted, combined with roll forming.

Benefits of technology

It improves the interfacial bonding between aluminum foil and positive electrode paste, enhances the flexibility and structural stability of the electrode, reduces defects caused by moisture evaporation, and improves the cycle performance and capacity retention of the electrode.

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Abstract

This invention discloses a method for preparing a high-load aqueous positive electrode sheet and the high-load aqueous positive electrode sheet itself, belonging to the field of electrochemical energy storage materials technology. The preparation method includes coating a positive electrode slurry onto the surface of an aluminum foil current collector, followed by stepwise drying and roll forming to obtain the high-load aqueous positive electrode sheet. The positive electrode slurry is a mixture of an active material, a conductive agent, an aqueous binder, water, and an organic solvent. The active material is selected from one or more of lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium-rich manganese base oxide, sodium nickel iron manganese oxide, sodium vanadium phosphate, and sodium fluorinated pyrophosphate. The aqueous binder is selected from a mixture of polyacrylic acid and sodium carboxymethyl cellulose, or a mixture of sodium alginate and sodium carboxymethyl cellulose. This method is simple, efficient, and suitable for large-scale production. Furthermore, the high-load aqueous positive electrode sheet prepared by this method has a stable structure, significantly improved cycle performance, and can be applied to different battery positive electrode material systems.
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