Solid-state battery positive electrode-electrolyte integrated assembly and preparation method thereof

By using multi-stage rolling technology to achieve continuous production of electrolyte membranes and low-impedance interface bonding, the problems of cracks and pores in electrolyte membranes in dry processes are solved, thereby improving battery performance and production efficiency.

CN122246280APending Publication Date: 2026-06-19浙江久功新能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
浙江久功新能源科技有限公司
Filing Date
2026-05-15
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In existing technologies, dry processes for preparing solid electrolyte films are prone to introducing cracks and pores during repeated rolling, resulting in insufficient mechanical strength and high impedance at the cathode-electrolyte interface, which affects battery performance and cycle life. Traditional improvement methods are complex and have limited effectiveness.

Method used

By employing multi-stage rolling technology and controlling the difference in linear velocity between adjacent rollers, the electrolyte membrane layer is continuously transferred in a non-self-supported state and directly bonded to the positive electrode to form an interpenetrating structure, thereby achieving non-destructive continuous production of the electrolyte membrane and low-impedance interface bonding.

Benefits of technology

It enables continuous production of electrolyte membranes, reduces interfacial impedance, improves mechanical integrity and battery performance, simplifies the production process, and reduces interfacial impedance by more than 45%.

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Abstract

This invention discloses an integrated cathode-electrolyte module for solid-state batteries and its preparation method, belonging to the field of solid-state battery manufacturing technology. The method includes: progressively thinning a solid electrolyte material containing a binder through multi-stage rolling; during this process, controlling the linear velocity difference between adjacent rollers allows for continuous transfer of the electrolyte film layer between different rollers, maintaining a non-self-supporting state throughout the thinning process; once the film layer reaches the target thickness, it is directly transferred to the surface of a pre-provided cathode sheet, and finally, the integrated module is obtained through composite rolling. This invention innovatively combines the final forming of the electrolyte film and interface bonding into one step, fundamentally avoiding film defects and winding difficulties caused by repeated peeling and independent winding in traditional dry processes. It also achieves in-situ dense bonding with the cathode sheet at the highest surface energy of the electrolyte film, reducing interface impedance and making it suitable for continuous production of ultra-thin, high-performance solid-state batteries.
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