A method for preparing a cation-nitrogen co-doped LLZO electrolyte ceramic membrane in one step

By employing a one-step sintering method and segmented temperature control technology, cation-nitrogen co-doping of LLZO electrolyte ceramic membranes is achieved using metal nitrides. This solves the problems of complex preparation processes and high energy consumption in existing technologies, improves the ionic conductivity and stability of LLZO electrolytes, and promotes their application in lithium-ion batteries.

CN122444516APending Publication Date: 2026-07-24UNIV OF JINAN
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF JINAN
Filing Date
2026-04-29
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The existing LLZO electrolyte ceramic membranes have complex preparation processes and high energy consumption, making it difficult to achieve uniformity and stability of anion and cation co-doping, which affects their ionic conductivity and commercial applications.

Method used

Using metal nitrides as reactants, a one-step sintering method combined with segmented temperature control technology was employed to achieve a synergistic coordination structure between metal M and N3-, simplifying the preparation process and improving ionic conductivity.

Benefits of technology

A high-ionic-conductivity, uniformly doped LLZO electrolyte ceramic membrane was prepared, which reduced energy consumption, improved the safety and performance of lithium-ion batteries, and simplified the preparation process.

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Abstract

The application belongs to the technical field of solid electrolyte, and particularly relates to a method for preparing a cation-nitrogen co-doped LLZO electrolyte ceramic film by one-step method. In view of the problems of complicated process, high cost and difficulty in industrialization of the existing electrolyte, the application provides a one-step sintering preparation scheme, and the obtained electrolyte is abbreviated as LLZO-MN, M is one or more of aluminum, gallium, indium, iron, titanium, zirconium and copper, metal nitride is used as a doping source, conventional lithium source, lanthanum source and zirconium source are matched, and after ball milling and die pressing, a segmented temperature control one-step sintering process is adopted to prepare in an air atmosphere, so that the secondary treatment process of traditional two-step sintering is saved; the metal M and N³ ‑ A Li-M-O-N synergistic coordination structure is formed in the crystal lattice, and no impurity phase is generated. The process is simple, the preparation cost is low, the original crystal structure is not damaged after doping, the interface reaction can be optimized, the lithium ion conductivity can be improved, the electrolyte has high density and uniform doping, and is suitable for solid-state lithium metal batteries and other energy storage devices.
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