Halide Solid Electrolyte Composition for Higher Ionic Conductivity

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Solution Overview

Problem

Halide solid electrolytes used in lithium ion batteries have room for improvement in ionic conductivity.

Innovation Solution

An ion conductive substance containing an alkali metal element, a tetravalent metal element, a halogen element, a dopant element, and oxygen, with specific compositional ranges and structural characteristics, such as a sea-island structure with crystallites of 20 nm or less, is developed. This substance is used to create an electrolyte and a battery with enhanced ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If dopant content is increased, then ionic conductivity is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improveionic conductivityVSAvoiddopant content control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent defines a specific parameter range for dopant content (50% by mol or less relative to tetravalent metal element M) and correlates it with the diffraction peak half-value width parameter, providing a controllable manufacturing window that balances ionic conductivity improvement with manufacturability

Inventive Principle:

Principle #35Parameter changes

2Reliability

If crystallite size is reduced to 20 nm or less, then ionic conductivity is enhanced, but manufacturing complexity increases

Engineering Contradiction:

Improveionic conductivityVSAvoidstructural control

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent controls the crystallite size parameter to 20 nm or less and correlates it with the diffraction peak characteristics, creating a specific structural state that enhances ionic conductivity while providing measurable parameters for quality control

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 ion conductive substance achieves excellent ionic conductivity, leading to improved performance in lithium ion batteries, including safety, high capacity, rapid charging and discharging, and increased pack energy density.

Implementation Method 1

an ion conductive substance having excellent ionic conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 2

in an X-ray diffraction chart obtained from measurement using a CuKα radiation at 25°C, the ion conductive substance has a diffraction peak having a half-value width of 2.0° to 10°

Methodology Applied

Scientific EffectX-ray diffraction: X-Ray

Data Source

PatentEP4571786A1Ion conductive substance, electrolyte, and battery

Publication Date: 2025.06.18 SUMITOMO CHEM CO LTD

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AI summary

An ion conductive substance includes: an alkali metal element; a tetravalent metal element M; a halogen element; a dopant element X; and an oxygen element, in which a content of the dopant element X is 50% by mol or less with respect to a content of the metal element M, and in an X-ray diffraction chart obtained from measurement using a CuKα radiation at 25°C, the ion conductive substance has a diffraction peak having a half-value width of 2.0° to 10° within a range of 2θ angle of 10° to 20°.