Halide Solid Electrolyte Composition for Safe Li-Ion Conduction

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Solution Overview

Problem

Existing solid electrolyte materials, such as sulfide-based electrolytes, generate hazardous hydrogen sulfide when exposed to the atmosphere and have limited lithium ion conductivity, hindering the development of safe and efficient all-solid-state batteries.

Innovation Solution

A solid electrolyte material composed of Li, Ca, Y, Sm, and O, with optional inclusion of F, Cl, Br, or I, and additional elements like Gd, Sr, Ba, Al, Sc, Ga, Bi, La, Zr, Hf, Ta, and Nb, to enhance ion conductivity, ensuring the material does not contain sulfur and maintains high lithium ion conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sulfide-based solid electrolyte materials are used, then lithium ion conductivity can be achieved, but hazardous hydrogen sulfide is generated when exposed to the atmosphere

Engineering Contradiction:

Improvelithium ion conductivityVSAvoidhydrogen sulfide generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the solid electrolyte by replacing sulfur-based compounds with halide-based compounds (Li2FeCl4, Li2FeBr4, Li2CoCl4, Li2CoBr4, Li2NiCl4, Li2NiBr4). This compositional parameter change eliminates the hydrogen sulfide generation issue while maintaining lithium ion conductivity through the halide crystal structure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful sulfur-containing compounds into beneficial halide compounds. By replacing the harmful sulfur element with halide elements (Cl, Br), the material maintains its functional properties (lithium ion conductivity) while eliminating the harmful byproduct (hydrogen sulfide), effectively transforming a harmful material system into a safe one.

Inventive Principle:

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

2Productivity

If existing solid electrolyte materials are used, then battery operation is possible, but lithium ion conductivity is limited, hindering efficient charge and discharge

Engineering Contradiction:

Improvecharge and discharge characteristicsVSAvoidlithium ion conductivity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent optimizes the lithium ion conductivity parameter by selecting specific halide compounds with favorable crystal structures and ionic conductivity properties. The use of Li2FeCl4, Li2FeBr4, Li2CoCl4, Li2CoBr4, Li2NiCl4, and Li2NiBr4 provides enhanced lithium ion transport pathways, directly improving charge and discharge characteristics.

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 new electrolyte material provides high lithium ion conductivity, safety by avoiding hydrogen sulfide generation, and enables excellent charge and discharge characteristics in all-solid-state batteries.

Implementation Method 1

The solid electrolyte material according to the first embodiment has a high lithium ion conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS12525643B2Solid electrolyte material and battery using same

Publication Date: 2026.01.13 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

The solid electrolyte material of the present disclosure includes Li, Ca, Y, Sm, X, and O, wherein X is at least one selected from the group consisting of F, Cl, Br, and I.