Composite solid electrolyte material and preparation method and application thereof

By preparing composite solid electrolyte materials, combining crystalline and amorphous phases with high-speed ball milling technology, the problems of ionic conductivity and stability of inorganic halide electrolytes were solved, achieving high ionic conductivity and air stability, which is suitable for the assembly of all-solid-state batteries.

CN122267279APending Publication Date: 2026-06-23GUOKE RE ADVANCED MATERIALS CO LTD +1
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Patent Information

Application Number
CN202411893783.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing inorganic halide electrolytes have room temperature ionic conductivity that is difficult to reach above 1 mS/cm, and they are prone to absorbing water and hydrolyzing in the air, which limits their large-scale production and application. Meanwhile, oxide electrolytes have poor mechanical properties, which hinder lithium-ion transport.

Method used

By using composite solid electrolyte materials, the crystalline and amorphous phases are combined and generated in situ on the particle surface through mechanochemical reactions. The amorphous phase components are introduced by high-speed ball milling to reduce grain boundary resistance. Furthermore, moisture-resistant non-metallic halides are used to replace traditional halide raw materials, thus preparing an electrolyte with high ionic conductivity and air stability.

Benefits of technology

It achieves high ionic conductivity and good air stability, can be cold-pressed in a mold, is suitable for the assembly of all-solid-state batteries, improves the contact tightness between the electrolyte and the cathode material, and promotes the interfacial mass transfer process.

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Abstract

The invention relates to the technical field of solid-state batteries, in particular to a composite solid-state electrolyte material as well as a preparation method and application thereof, the composite solid-state electrolyte material comprises a crystalline phase substance, and the chemical general formula of the crystalline phase substance is B% AaREbX1cDg + C% AdMeX2fDh, wherein A is a current carrier; rE is a rare earth element; m is a metal element; x1 and X2 are halide anions; d is an anion doping element or group; aaREbX1cDg and AdMeX2fDh are used as crystal phase substances; b% is the mass fraction of AaREbX1cDg in the composite solid electrolyte material; c% is the mass fraction of AdMeX2fDh in the composite solid electrolyte material; wherein 0 < = a < = 3, 0 < b < = 1, 0.5 < c < = 12, 0 < d < = 5, 0 < e < = 2, 1 < f < = 20, 0 < = g < = 4, and 0 < = h < = 5; 85 < B + C < 98, 10% < B% < = 85%; 10% < C < = 85%, 0.2 < = C / B < = 10. The composite solid electrolyte material comprises a crystalline phase component and an amorphous phase component, so that the composite solid electrolyte material has high ionic conductivity, and in the raw materials, a moisture-proof nonmetal halide component is used for replacing a traditional metal halide raw material of halide and oxyhalide, so that the composite solid electrolyte material also has the characteristic of good air stability.
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