Composite positive electrode material and preparation method and application thereof

By coating the surface of the cathode material core with a Li1.3Al0.3Ti1.7(PO4)3(LATP) solid electrolyte coating layer, the problem of high impedance between LATP and the cathode material is solved, achieving high capacity and long life of lithium-ion batteries, which are suitable for industrial applications.

CN118553872BActive Publication Date: 2025-12-12BYD CO LTD +1
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Patent Information

Application Number
CN202410489663.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-04-18
Publication Date
2025-12-12
Estimated Expiration
2044-04-18

AI Technical Summary

Technical Problem

The NASICON-type Li1.3Al0.3Ti1.7(PO4)3(LATP) solid electrolyte forms a high impedance with the cathode material in all-solid-state lithium batteries, which hinders its large-scale application, and the preparation process is complex.

Method used

A uniform Li1.3Al0.3Ti1.7(PO4)3(LATP) solid electrolyte coating layer is formed on the surface of the cathode material core through in-situ growth, with a thickness controlled between 3nm and 15nm and an average thickness deviation of less than 5nm, thereby improving interfacial contact and adhesion.

Benefits of technology

It improves the structural stability of composite cathode materials, optimizes lithium-ion migration paths, reduces interface resistance, and enhances battery capacity and cycle life, making it suitable for large-scale industrial production.

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Abstract

The application provides a composite positive electrode material and a preparation method and application thereof. The composite positive electrode material comprises a core and a coating layer coated on the surface of the core. The core comprises a positive electrode active material. The coating layer comprises Li 1.3 Al 0.3 Ti 1.7 (PO4)3. The thickness of the coating layer is 3-15 nm. The average thickness deviation of the coating layer is less than 5 nm. The difference between the maximum value of the thickness of the coating layer and the minimum value of the thickness of the coating layer is less than or equal to 12 nm. The solid-state electrolyte Li 1.3 Al 0.3 Ti 1.7 (PO4)3 is used to coat the core of the positive electrode active material. The solid-state electrolyte coating layer has high thickness uniformity, can effectively improve the structural stability of the composite positive electrode material in the charging and discharging process, reduce the interface resistance between the positive electrode sheet and the electrolyte, and improve the capacity and cycle life of the battery.
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Citation Information

Patent Citations

  • Lithium battery core-shell positive electrode material, lithium battery containing lithium battery core-shell positive electrode material and preparation method of lithium battery

    CN113871588A

  • Method for coating solid-state battery positive electrode material, positive electrode material, and solid-state battery

    WO2022121636A1