Solid Electrolyte Composition for Solvent-Stable Ion Conductivity

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Solution Overview

Problem

Conventional solid electrolyte materials suffer from deterioration in ionic conductivity when mixed with organic solvents, and existing inorganic solid electrolytes face issues such as toxicity or low ionic conductivity, hindering the development of high-energy density solid-state rechargeable batteries.

Innovation Solution

A sulfur element-free ionic solid electrolyte material is combined with specific organic solvents, such as hydrocarbons and compounds with functional groups like ether, halogen, or Si—O—C groups, to form a solid electrolyte composition that maintains high ionic conductivity upon solvent removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If sulfur element-free ionic solid electrolyte material is mixed with organic solvent, then ease of manufacture and film formation are improved, but ionic conductivity deteriorates

Engineering Contradiction:

Improveease of manufactureVSAvoidionic conductivity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies parameter changes by carefully controlling the molecular weight, functional group type, and concentration of the organic solvent. Specifically, using solvents with molecular weight of 50-500 and specific functional groups (ether, halogen, Si-O-C) while maintaining solvent content at 1-50 wt% allows the material to be processed into films while preserving ionic conductivity above 10^-5 S/cm

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining sulfur element-free ionic solid electrolyte material with specifically selected organic solvents. This composite approach allows the organic solvent to act as a processing aid that facilitates film formation through controlled interaction, then can be removed or remains as a benign component without compromising the electrolyte's ionic conductivity

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional solid electrolyte materials are used, then manufacturing is simplified, but toxicity and low ionic conductivity occur

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidtoxicity

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by selecting sulfur element-free ionic solid electrolyte materials with specific cation-anion combinations (e.g., Li-Y-Cl, Li-Y-Br, Li-Y-I systems). This compositional change eliminates toxicity associated with sulfur-based electrolytes while maintaining high ionic conductivity through optimized stoichiometry and phase structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harm of using complex, toxic sulfur-based electrolytes into a benefit by selecting alternative sulfur-free materials that are inherently less toxic. The challenge of finding suitable processing methods for these new materials is resolved through the introduction of compatible organic solvents, turning a manufacturing complexity into a solved process

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-affected harmful factors

If sulfur element-free ionic solid electrolyte material is used, then toxicity is reduced, but ionic conductivity deteriorates

Engineering Contradiction:

ImprovetoxicityVSAvoidionic conductivity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent applies parameter changes by optimizing the chemical composition ratios in the sulfur-free electrolyte system, specifically adjusting the proportions of lithium, rare earth elements (Y, La, Nd, etc.), and halogen atoms. By controlling these compositional parameters and ensuring specific structural arrangements, the patent achieves ionic conductivity above 10^-5 S/cm while maintaining sulfur-free, non-toxic composition

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 composition allows for the production of a solid electrolyte member with enhanced lithium ion conductivity, reducing pinholes and unevenness, and improving charge-discharge efficiency in solid-state batteries.

Implementation Method 1

a solid electrolyte composition containing a sulfur element-free ionic solid electrolyte material and an organic solvent

Methodology Applied

Scientific EffectSolvation: Solvation

Data Source

PatentUS12451513B2Solid electrolyte composition and method of producing solid electrolyte member

Publication Date: 2025.10.21 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

The present disclosure provides a solid electrolyte composition that can suppress deterioration in ion conductivity of an ionic solid electrolyte material. The solid electrolyte composition according to the present disclosure contains a sulfur element-free ionic solid electrolyte material and an organic solvent, where the organic solvent includes at least one selected from the group consisting of a hydrocarbon and a compound having a functional group; and the functional group is at least one selected from the group consisting of an ether group, a halogen group, and a Si—O—C group.