Red-Phosphorus Sulfide Electrolyte for Flame Retardancy and H2S Suppression

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Solution Overview

Problem

Conventional solid electrolytes used in batteries are not flame-retardant and suffer from reduced ionic conductivity when flame retardants are added, and they can generate hydrogen sulfide, which is hazardous, especially when exposed to air.

Innovation Solution

A sulfide solid electrolyte composition incorporating red phosphorus, which provides flame retardancy, suppresses hydrogen sulfide generation, and maintains high ionic conductivity, by forming a thin coating that prevents contact with oxygen and water, and is mixed with an electrode active material to enhance battery performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-generated harmful factors

If sulfide solid electrolyte is exposed to air, then hydrogen sulfide generation occurs, but flame retardancy is not improved

Engineering Contradiction:

Improvehydrogen sulfide generationVSAvoidflame retardancy

Core Design Contradiction:

Object-generated harmful factorsVSReliability

Solution Approach 1:

The patent converts the harmful reaction between sulfide electrolyte and oxygen into a beneficial process by controlling it to form a protective red phosphorus oxide coating. This coating prevents further harmful reactions while providing flame retardancy, thus converting the harmful exposure to air into a protective mechanism

Inventive Principle:

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

2Reliability

If red phosphorus content is increased, then flame retardancy is improved, but manufacturing precision becomes difficult to control

Engineering Contradiction:

Improveflame retardancyVSAvoidcomposition control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent optimizes the red phosphorus content to a specific range (0.1-45 mass%) where flame retardancy is effectively achieved while maintaining controllable manufacturing precision. By identifying this optimal parameter range, the invention balances performance requirements with manufacturing feasibility

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 sulfide solid electrolyte composition exhibits excellent flame retardancy, high ionic conductivity, and reduced hydrogen sulfide generation, improving safety and performance in battery applications.

Implementation Method 1

by forming a thin coating that prevents contact with oxygen and water

Methodology Applied

Scientific EffectCoating formation: Coatings

Implementation Method 2

a thin coating that prevents contact with oxygen and water

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 3

high ionic conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 4

exhibits excellent flame retardancy and high ionic conductivity

Methodology Applied

Scientific EffectFast ion conduction: Fast Ion Conductor

Data Source

PatentUS20240283008A1Sulfide solid electrolyte composition, electrode mixture containing same, and method for producing sulfide solid electrolyte composition

Publication Date: 2024.08.22 IDEMITSU KOSAN CO LTD

AI summary

Provided are a sulfide solid electrolyte composition containing a sulfide solid electrolyte and red phosphorus, having an excellent flame retardancy and a high ionic conductivity and further having excellent hydrogen sulfide generation suppressing performance; an electrode mixture containing the composition; and a method for producing a sulfide solid electrolyte composition including mixing a sulfide solid electrolyte and red phosphorus.