Solid Electrolyte Composition That Preserves Ion Conductivity

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Solution Overview

Problem

Conventional solid electrolyte materials suffer from deterioration in ionic conductivity when mixed with organic solvents, which is a concern for solid-state rechargeable batteries, particularly those using sulfur element-free ionic solid electrolytes.

Innovation Solution

A solid electrolyte composition comprising a sulfur element-free ionic solid electrolyte material and an organic solvent, specifically hydrocarbons or compounds with functional groups like ether, halogen, or Si—O—C groups, is used to enhance dispersibility and maintain high ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If sulfur element-free ionic solid electrolyte material is mixed with organic solvent, then dispersibility is improved, but ionic conductivity deteriorates

Engineering Contradiction:

ImprovedispersibilityVSAvoidionic conductivity

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent changes the chemical parameters of the organic solvent by selecting specific functional groups (ether, halogen, Si-O-C) that are compatible with sulfur element-free ionic solid electrolyte materials. This parameter selection allows the solvent to provide good dispersibility while maintaining ionic conductivity, resolving the contradiction between composition stability and reliability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The organic solvent acts as an intermediary between the solid electrolyte material particles, facilitating their dispersion while the specifically selected functional groups ensure that this dispersion process does not compromise the ionic conductivity of the material.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If conventional organic solvents are used, then ease of manufacture is improved, but manufacturing precision deteriorates due to pinholes and unevenness

Engineering Contradiction:

Improveease of processingVSAvoidsurface uniformity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent modifies the chemical parameters of the organic solvent by selecting compounds with specific functional groups (ether, halogen, Si-O-C) that are compatible with sulfur element-free ionic solid electrolyte materials. This parameter selection allows the solvent to provide good dispersibility while maintaining ionic conductivity, resolving the contradiction between composition stability and reliability.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If sulfur element-free ionic solid electrolyte material is used, then safety is improved by eliminating toxic hydrogen sulfide, but ionic conductivity is reduced compared to sulfide-based electrolytes

Engineering Contradiction:

ImprovetoxicityVSAvoidionic conductivity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260024806A1Solid electrolyte composition and method of producing solid electrolyte member

Publication Date: 2026.01.22 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.