A sulfide electrolyte material and a preparation method and application thereof

By coating the surface of a sulfide electrolyte with a glass-ceramic sulfide electrolyte, the problems of low air stability and low ionic conductivity of sulfide electrolyte materials were solved, enabling low-cost large-scale preparation and performance improvement of all-solid-state secondary batteries.

CN116487687BActive Publication Date: 2026-06-16SVOLT ENERGY TECH (WUXI) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SVOLT ENERGY TECH (WUXI) CO LTD
Filing Date
2023-05-08
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing sulfide solid electrolyte materials have poor stability in air and low ionic conductivity, resulting in harsh preparation environments that prevent mass production and affect battery performance and energy density.

Method used

A sulfide electrolyte material with both high ionic conductivity and high air stability was prepared by surface coating modification of a sulfide electrolyte of silver-germanium sulfide type using a glass-ceramic sulfide electrolyte and ALD coating and low-temperature heat treatment.

Benefits of technology

This achievement enables the improvement of air stability while ensuring high ionic conductivity, solves the problem of harsh preparation environment, and promotes the large-scale continuous preparation and performance improvement of all-solid-state secondary batteries.

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Abstract

The application provides a sulfide electrolyte material and a preparation method and application thereof, and the sulfide electrolyte material comprises a argyrodite-type sulfide electrolyte core and a glass-ceramic-type sulfide electrolyte coating layer arranged on the surface of the argyrodite-type sulfide electrolyte core, the chemical formula of the argyrodite-type sulfide electrolyte core is Li 7‑x PS 6‑x N x wherein N comprises any one or a combination of at least two of Cl, Br, F or I, 0.1≤x≤5.9, and the chemical formula of the glass-ceramic-type sulfide electrolyte coating layer is Li3PS4. The application realizes the purpose of ensuring higher ion conductivity and higher air stability of the target electrolyte by using the glass-ceramic-type sulfide electrolyte to coat and modify the surface of the argyrodite-type sulfide electrolyte.
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