Preparation method of lithium-rich lithium titanium phosphate solid-state electrolyte and application thereof

The preparation of lithium-rich titanium phosphate solid electrolyte by the sol-gel method solves the problems of energy consumption, time consumption and large-scale production of high-temperature solid-phase reaction methods, and realizes efficient and low-cost solid electrolyte synthesis with ultra-high ionic conductivity and solid lithium metal batteries suitable for large-scale production.

CN122246244APending Publication Date: 2026-06-19WUHAN UNIV OF TECH
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Patent Information

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

AI Technical Summary

⚠Technical Problem

Existing high-temperature solid-state reaction methods for preparing lithium-rich lithium titanium phosphate solid electrolytes suffer from problems such as high energy consumption and time consumption, high equipment requirements, uneven mixing of raw materials, and difficulty in large-scale production, which cannot meet the industrialization needs of solid-state lithium metal batteries.

⚗Method used

The sol-gel method was adopted to achieve uniform mixing of raw materials through a simple stirring process, and then to prepare nanoscale solid electrolyte powder by calcination at a low temperature. The specific steps include stirring a mixed solution of Li source, Ti source and P source in an organic solvent, adding deionized water and heating and stirring to form a precursor sol, drying and calcining at high temperature to obtain solid electrolyte.

🎯Benefits of technology

It achieves efficient and low-cost synthesis of solid electrolytes with ultra-high bulk room temperature ionic conductivity and total ionic conductivity, making it suitable for large-scale production, reducing preparation costs and energy consumption, and improving product quality consistency.

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Abstract

This invention belongs to the field of all-solid-state lithium metal batteries and discloses a method for preparing a lithium-rich titanium phosphate lithium solid electrolyte and its application. The preparation method of this invention has the advantages of simplicity, energy saving, and suitability for large-scale production. By optimizing precursor preparation and reaction conditions, the synthesis temperature is significantly reduced and the reaction cycle is shortened. The resulting electrolyte material has a pure phase and excellent ionic conductivity, effectively solving the key challenges in the practical preparation of this material. This method is of great value in promoting the industrial application of high-safety, high-energy-density solid-state lithium metal batteries. The solid electrolyte powder prepared by this method is in the form of nanoparticles with a narrow particle size distribution, and exhibits a bulk room-temperature ionic conductivity exceeding [value missing] and a total ionic conductivity exceeding [value missing]. This invention is of great significance for the large-scale production of solid-state electrolytes and the promotion of their application in lithium metal batteries.
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