A core-shell composite material, a preparation method and application thereof

By forming a core-shell composite structure on a NASICON-type solid electrolyte material and using surface modifiers and sodium/lithium-based fluoride layers for coating, the problems of water absorption and narrow electrochemical window were solved, achieving high ionic conductivity and stable electrochemical performance, thus improving battery performance.

CN117525551BActive Publication Date: 2026-07-21JIANGSU LIONG0 NEW ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU LIONG0 NEW ENERGY TECH CO LTD
Filing Date
2023-12-06
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing NASICON-type solid electrolyte materials suffer from high water absorption and a narrow electrochemical window, making it difficult to meet the high-performance requirements of lithium-ion or sodium-ion batteries.

Method used

The material employs a core-shell composite material structure, with the core being a NASICON-type solid electrolyte and the outer layer coated with a hydrophobic film formed by surface modifiers and a sodium/lithium-based fluoride layer. The hydrophobicity and electrochemical window of the material are improved through the structural disordering treatment of the surface modifiers and the coating of sodium/lithium-based fluoride.

Benefits of technology

It significantly improves the ionic conductivity and chemical stability of solid electrolytes, broadens the electrochemical window, reduces internal resistance, and improves battery capacity retention and coulombic efficiency.

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Abstract

The application provides a core-shell composite material, a preparation method and application thereof. The core-shell composite material comprises an inner core, a first coating layer coated on the surface of the inner core, and a second coating layer coated on the surface of the first coating layer. The inner core is a first electrolyte body; the first coating layer is a surface modifier; and the second coating layer is a sodium / lithium-based fluoride. The surface modifier can cooperate with a sanding technology to make the surface structure of the electrolyte body crystal grain disordered, and contains abundant lipophilic hydrophobic groups, so that the first coating layer has strong hydrophobicity, and the problems of low mechanical strength and water absorption in storage of the core-shell composite material as an electrolyte in the application process are solved. The sodium / lithium-based fluoride ensures the bonding strength and coating compactness of the second coating layer. The core-shell composite material as a solid-state electrolyte has excellent ionic conductivity, chemical structure stability, hydrophobicity and a wide electrochemical window.
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Citation Information

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