Glassy Sulphide Solid Electrolyte With High ΔTx and Li-Ion Conductivity

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Solution Overview

Problem

Existing sulphide based lithium-ion conducting solid electrolytes face challenges with either low ionic conductivity or high ΔTx, limiting their effectiveness in solid-state batteries.

Innovation Solution

A solid material composed of Li2S, B2S3, and B2O3, prepared by melt-quenching in specific molar ratios, achieving a composition that balances high thermal stability (ΔTx > 100°C) with high ionic conductivity (>0.1 mS/cm) and low electronic conductivity (<1×10−4 mS/cm).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If glassy solid electrolyte materials are produced by melt-quenching to avoid crystalline regions, then isotropic conduction and dendrite prevention are improved, but crystallization control during processing becomes more difficult

Engineering Contradiction:

Improveisotropic conductionVSAvoidcrystallization control

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention optimizes the compositional parameters within specific ranges (Li2S: 60-80 mol%, B2S3: 10-30 mol%, B2O3: 5-20 mol%) to maximize glass-forming ability and thermal stability. The B2O3 component specifically enhances ΔTx, providing a wider processing window that makes crystallization control easier while maintaining isotropic conduction properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

B2O3 acts as an intermediary component that enhances the glass-forming ability and thermal stability of the Li2S-B2S3 system. It mediates the crystallization process by increasing ΔTx, thereby facilitating the production of defect-free glassy films during melt-quenching while maintaining isotropic conduction

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The resulting glassy solid electrolytes exhibit enhanced thermal stability, high ionic conductivity, and low electronic conductivity, making them suitable for safe and efficient use in solid-state batteries.

Implementation Method 1

The present invention relates to solid materials which are obtainable by melt-quenching mixtures of lithium sulphide, boron sulphide and boron oxide, thereby forming a glassy solid

Methodology Applied

Scientific EffectMelt-quenching: Vitrification

Data Source

PatentUS20250293293A1Sulphide based lithium-ion conducting solid electrolyte and methods for the production thereof

Publication Date: 2025.09.18 UMICORE(BE)

AI summary

The present invention relates to solid materials which are obtainable by melt-quenching mixtures of lithium sulphide, boron sulphide and boron oxide, thereby forming a glassy solid which is suitable for use as a lithium-ion conducting electrolyte. These sulphide based lithium-ion conducting solid electrolytes exhibit a large thermal stability as supported by the large ΔTx, in particular a ΔTx of more than 100° C.