Halide Solid Electrolyte Heat Recovery After Moisture Exposure

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Solution Overview

Problem

Halide-based solid electrolytes are vulnerable to moisture, leading to reduced ionic conductivity and performance degradation, necessitating a method to improve their water resistance and recover performance.

Innovation Solution

Exposing halide-based solid electrolytes to moisture-containing air and subsequently heat-treating them at specific temperatures (200°C to 400°C) to restore ionic conductivity to levels comparable to pristine state.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If halide-based solid electrolytes are used to improve oxidation stability, then oxidation resistance is improved, but water resistance deteriorates

Engineering Contradiction:

Improveoxidation stabilityVSAvoidmoisture vulnerability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by heat-treating the halide-based solid electrolyte at specific temperatures (200-400°C) to restore its performance after moisture exposure. This thermal treatment modifies the physical and chemical parameters of the electrolyte, recovering ionic conductivity to 90-100% of original levels while preserving the oxidation stability inherent to halide-based materials.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If solid electrolyte is used to improve safety, then safety is improved, but strength is reduced

Engineering Contradiction:

ImprovesafetyVSAvoidmechanical strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies parameter changes through controlled heat treatment at 200-400°C to restore and optimize the mechanical properties of the halide-based solid electrolyte. This thermal processing modifies the material's structural parameters, enhancing both mechanical strength and ionic conductivity while preserving the safety benefits of using a solid electrolyte.

Inventive Principle:

Principle #35Parameter changes

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 heat treatment method effectively recovers ionic conductivity of halide-based solid electrolytes to 90% to 100% of their original levels, reversing structural changes caused by moisture exposure.

Implementation Method 1

heat-treating the halide-based solid electrolyte that has been exposed to the air

Methodology Applied

Scientific EffectHeat treatment: Heat Treatment

Implementation Method 2

when a halide-based solid electrolyte (e.g., Li 3 InCl 5 (LIC), etc.) is exposed to moisture-containing air and then heat-treated at a certain temperature, the heat treatment functions to restore the ionic conductivity that was lost due to the exposure to moisture

Methodology Applied

Scientific EffectThermal dehydration: Desorption

Data Source

PatentEP4593141A1Method for regenerating or recovering performance of halide-based solid electrolyte

Publication Date: 2025.07.30 LG ENERGY SOLUTION LTD

Figure 1

AI summary

Methods for recovering the performance of a halide-based solid electrolyte are described. In one aspect, a halide-based solid electrolyte that has been exposed to air is subjected to a heat-treatment process, where the performance of the halide-based solid electrolyte is recovered, e.g., the ionic conductivity obtained after heat treatment is recovered to a level similar to that before air exposure.