A lithium sodium composite inorganic sulfide solid electrolyte material and preparation method thereof

By adding Na elements to the lithium-ion solid electrolyte and adjusting the element ratio, a high-ion conductivity lithium-sodium composite inorganic sulfide solid electrolyte material was prepared, which solved the problem of low ionic conductivity of existing materials and realized the application of high-performance all-solid state batteries.

CN117174992BActive Publication Date: 2025-03-28GUOLIAN CORE MATERIALS (BEIJING) TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202311022496.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-14
Publication Date
2025-03-28
Estimated Expiration
2043-08-14

AI Technical Summary

Technical Problem

The existing inorganic sulfide solid electrolyte materials have low ionic conductivity and are difficult to meet the needs of high-performance all-solid state batteries.

Method used

By adding a small amount of Na element to the lithium-ion solid electrolyte, the types and proportions of elements in the inorganic sulfide solid electrolyte material are adjusted, and a variety of different types of lithium-sodium composite inorganic sulfide solid electrolyte materials with solid solution phase structure are obtained. The preparation method of the material includes mixing the raw materials under an inert atmosphere protection and grinding, and then performing heat treatment to improve the ionic conductivity of the material.

Benefits of technology

The ionic conductivity of lithium-sodium composite inorganic sulfide solid electrolyte material has been significantly improved to reach 6.37mS/cm, meeting the application needs of high-performance all-solid state batteries.

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Abstract

The present invention relates to the technical field of lithium-ion batteries, and in particular to a lithium-sodium composite inorganic sulfide solid electrolyte material and a preparation method thereof. The composition of the lithium-sodium composite inorganic sulfide solid electrolyte material of the present invention is shown in the following general formula I: Li 7‑i‑k‑ 1Na i P j S k X1(I); wherein X is one or more of F, Cl, Br, and I, 0.0<i<7.0, 0.0<j≤1.0, 3.0<k≤6.5, and 0.0≤1<2.0. A lithium-sodium composite inorganic sulfide solid electrolyte material of the present invention obtains a plurality of different types of lithium-sodium composite inorganic sulfide solid electrolyte materials with solid solution phase structures by adjusting the types and proportions of elements in the material. The lithium-sodium composite inorganic sulfide solid electrolyte material has higher ionic conductivity, and can further realize the application of sulfide solid electrolyte materials in high-performance all-solid-state batteries.
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