Phosphorus Sulfide Composition for Higher-Conductivity Solid Electrolytes

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Solution Overview

Problem

The sulfide-based inorganic solid electrolyte material used in lithium ion batteries has lower lithium ionic conductivity compared to electrolytic solutions, necessitating an improvement while maintaining electrochemical stability.

Innovation Solution

A method of manufacturing a sulfide-based inorganic solid electrolyte material using a phosphorus sulfide composition with specific ranges of P4S10 and P4S9 content, along with controlled molar ratios of Li, P, and S, to enhance lithium ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sulfide-based inorganic solid electrolyte material is used to replace electrolytic solution in lithium ion battery, then safety is improved and manufacturing costs are reduced, but lithium ionic conductivity is lower than electrolytic solution

Engineering Contradiction:

ImprovesafetyVSAvoidlithium ionic conductivity

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the chemical composition parameters of the phosphorus sulfide raw material, specifically controlling the P4S10 content to 30-70 mass% and P4S9 content to 30-70 mass%, to optimize the lithium ionic conductivity of the solid electrolyte material while maintaining its safety advantages

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite phosphorus sulfide composition containing multiple phosphorus sulfide compounds (P4S10 and P4S9) as raw materials to manufacture the solid electrolyte material, achieving improved lithium ionic conductivity through the synergistic effect of different phosphorus sulfide compounds

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If phosphorus sulfide composition with specific P4S10 and P4S9 content is used as raw material, then lithium ionic conductivity is improved, but manufacturing precision requirement increases

Engineering Contradiction:

Improvelithium ionic conductivityVSAvoidcomposition control precision

Core Design Contradiction:

Use of energy by moving objectVSManufacturing precision

Solution Approach 1:

The patent defines specific ranges for P4S10 (30-70 mass%) and P4S9 (30-70 mass%) content in the phosphorus sulfide composition, providing clear manufacturing parameters that balance conductivity improvement with manufacturability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent specifies that the sum of P4S10 and P4S9 content should be 60-100 mass%, allowing some flexibility in the composition while ensuring sufficient total phosphorus sulfide content for achieving the desired conductivity, thus reducing manufacturing precision requirements

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP4039642B1Method for manufacturing a phosphorus sulfide composition for sulfide-based inorganic solid electrolyte material

Publication Date: 2026.03.04 FURUKAWA COMPANY

Figure 1

AI summary

Provided is a phosphorus sulfide composition for a sulfide-based inorganic solid electrolyte material, the phosphorus sulfide composition including P4S10 and P4S9, in which when a total content of P4S10, P4S9, P4S7, and P4S3 in the phosphorus sulfide composition is represented by 100 mass%, a content of P4S10 calculated from a solid 31P-NMR spectrum is 70 mass% or more and 99 mass% or less.