Lithium sulfide and preparation method therefor
Thermal reduction and solvent extraction with sulfur replenishment, followed by controlled heat treatment, address sulfur loss and impurity issues in lithium sulfide production, resulting in high-purity lithium sulfide with improved ion conductivity for all-solid-state batteries.
WO2026135016A1PCT 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
- 2025-12-11
- Publication Date
- 2026-06-25
AI Technical Summary
Technical Problem
Existing methods for manufacturing lithium sulfide suffer from insufficient purification due to sulfur loss during solvent extraction, leading to impurities that reduce ion conductivity when used in battery materials.
Method used
A method involving thermal reduction of a lithium raw material with carbon, followed by solvent extraction with an optimal solvent, and additional sulfur replenishment, along with controlled heat treatment to achieve specific NMR peak ratios, ensuring optimal impurity levels and ion conductivity.
Benefits of technology
The method produces high-purity lithium sulfide with controlled impurity levels, enhancing ion conductivity and yield, suitable for use in all-solid-state batteries.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure KR2025021450_25062026_PF_FP_ABST
Abstract
The present invention relates to lithium sulfide and a preparation method therefor, and provides lithium sulfide comprising peak A at 2.2 to 2.5 ppm, peak B at 1.2 to 2.1 ppm, peak C at -0.7 to -0.5 ppm, peak D at 2.9 to 3.1 ppm, and peak E at -0.2 to 1.15 ppm, wherein, with respect to the integral ratio of the peaks, 5 ≤ A / B and 1 ≤ B / C.
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