Solid electrolyte and all-solid-state battery comprising same

WO2026134749A1PCT designated stage Publication Date: 2026-06-25POSCO HLDG INC

Patent Information

Authority / Receiving Office: WO · WO
Patent Type: Applications
Current Assignee / Owner: POSCO HLDG INC
Filing Date: 2025-11-25
Publication Date: 2026-06-25

AI Technical Summary

Technical Problem

Existing sulfide-based solid electrolytes for all-solid-state batteries suffer from low moisture stability and degradation of ionic conductivity due to reactions with atmospheric moisture, while doping with metal elements to improve stability often compromises electrochemical properties.

Method used

A sulfide-based solid electrolyte with an argyrodite crystal structure, containing lithium, phosphorus, sulfur, boron, oxygen, and multiple halogen elements, is formulated to enhance moisture stability and ionic conductivity, using specific molar ratios and doping with boron and oxygen to stabilize the structure.

Benefits of technology

The electrolyte achieves improved moisture stability and maintains excellent ionic conductivity and electrochemical properties, effectively addressing the limitations of existing technologies.

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Abstract

The present invention relates to a solid electrolyte comprising a sulfide-based compound containing lithium (Li), phosphorus (P), sulfur (S), boron (B), oxygen (O), and two or more types of halogen elements and having an Argyrodite-type crystal structure, wherein the sulfide-based compound is represented by the following chemical formula 1. [Chemical formula 1] Li(7-x)(1-a)P(1-a)B2aS(6-x)(1-a)O3aClx(1-a)-b-c-dBrbIcFd In chemical formula 1, 0.2≤x≤2, 0.005≤a≤0.2, 0≤b≤1.0, 0≤c≤1.0, and 0≤d≤1.0.

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