Solid electrolyte and all-solid-state battery comprising same

A modified sulfide-based argyrodite crystal structure in solid electrolytes addresses lithium dendrite formation in all-solid-state batteries, ensuring safety and performance by suppressing dendrites and maintaining ionic conductivity.

WO2026134795A1PCT designated stage Publication Date: 2026-06-25POSCO HLDG INC
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Patent Information

Application Number
PCT/KR2025/020178
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-12-16
Filing Date
2025-11-28
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

All-solid-state batteries using lithium metal or lithium alloy as the negative electrode material face issues with lithium dendrite formation leading to short circuits due to repeated charging and discharging, which compromises safety and performance.

Method used

A sulfide-based compound with an argyrodite crystal structure, modified to include specific peak intensity ratios and additional elements, is used to suppress lithium dendrite formation, enhancing structural stability and ionic conductivity.

Benefits of technology

The modified argyrodite-based solid electrolyte effectively prevents short circuits while maintaining high ionic conductivity, improving the capacity and lifespan of all-solid-state batteries.

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Abstract

The present invention relates to a solid electrolyte comprising a sulfide-based compound which contains lithium (Li), phosphorus (P), sulfur (S), and halogen (D) elements, and which has an argyrodite-based crystal structure, wherein: during X-ray absorption near edge structure (XANES) spectrum analysis for a sulfur (S) K-edge, the sulfide-based compound exhibits a peak (Ia peak) in a region in which an X-ray energy absorption amount is 2465 to 2470 eV, and exhibits a peak (Ib peak) in a region in which an X-ray energy absorption amount is 2470 to 2472 eV; and the peak intensity ratio (Ia / Ib) of the Ia peak to the Ib peak is 0.14 to 0.43.
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