Halide Solid Electrolyte Composition Without H2S Tradeoff

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Solution Overview

Problem

Existing solid electrolyte materials, particularly sulfide-based ones, suffer from safety issues due to hydrogen sulfide generation when exposed to the atmosphere, and they often have lower lithium-ion conductivity, limiting their performance in batteries.

Innovation Solution

A solid electrolyte material composed of Li, M1, and M2, where M1 is Ca, Mg, or Zn, and M2 is Y or Sm, with X being F, Cl, or Br, offering a composition that enhances lithium-ion conductivity and avoids sulfur, thereby improving safety by preventing hydrogen sulfide generation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sulfide solid electrolyte is used, then lithium-ion conductivity is improved, but safety deteriorates due to hydrogen sulfide generation

Engineering Contradiction:

Improvelithium-ion conductivityVSAvoidhydrogen sulfide generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent removes sulfur from the electrolyte composition entirely, extracting the harmful element that causes hydrogen sulfide generation while retaining the beneficial lithium-ion conductivity through alternative halide-based chemistry

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs a composite halide electrolyte system combining multiple metal halides (alkali metal halides, alkaline earth metal halides, and/or transition metal halides) to achieve high lithium-ion conductivity without the safety issues of sulfide-based materials

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If sulfur-containing electrolyte is used, then manufacturing is simplified, but safety deteriorates due to hydrogen sulfide generation

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidhydrogen sulfide generation

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

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 achieves high lithium-ion conductivity of 1 mS/cm or more at room temperature, ensuring excellent charge and discharge characteristics in all-solid-state batteries without the safety hazards associated with sulfur-containing electrolytes.

Implementation Method 1

a solid electrolyte material consisting of Li, M1, M2, and X... having a high lithium-ion conductivity

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Data Source

PatentUS12531268B2Solid electrolyte material and battery using same

Publication Date: 2026.01.20 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

The solid electrolyte material of the present disclosure consists of Li, M1, M2, and X, wherein M1 is at least two selected from the group consisting of Ca, Mg, and Zn; M2 is at least one selected from the group consisting of Y, Gd, and Sm; and X is at least one selected from the group consisting of F, Cl, Br, and I.