Surface Oxygen-Rich Solid Electrolyte for H2S-Free Ion Conduction

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Solution Overview

Problem

Existing solid electrolyte materials, such as sulfide solid electrolytes, generate hydrogen sulfide when exposed to the atmosphere and have lower lithium ion conductivity, limiting their safety and performance in all-solid-state batteries.

Innovation Solution

A solid electrolyte material composed of Li, Ca, Y, Sm, and O, with a higher molar ratio of O to the sum of Y and Sm in the surface region, enhancing lithium ion conductivity and excluding sulfur to prevent hydrogen sulfide generation, and optionally including additional elements like Cl and Br to further improve conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sulfide solid electrolyte is used, then lithium ion conductivity is improved, but hydrogen sulfide is generated when exposed to 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 by replacing sulfur with oxygen in the solid electrolyte material, specifically using the formula Li6-3z-y-zYzX6 where X is F, Cl, Br, or I. This compositional parameter change eliminates hydrogen sulfide generation while maintaining high lithium ion conductivity through optimized stoichiometric ratios and surface oxygen enrichment.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful effect of sulfur exposure into a beneficial oxygen-rich surface composition. By designing the material with controlled oxygen content at the surface (higher O to (Y+Sm) ratio in surface region), the material achieves both safety (no H2S generation) and performance (high conductivity) simultaneously.

Inventive Principle:

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

2Reliability

If surface composition is modified to improve conductivity, then lithium ion conductivity is enhanced, but manufacturing precision is required

Engineering Contradiction:

Improvelithium ion conductivityVSAvoidsurface composition control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by creating a surface region with distinct composition from the bulk material. The surface has a higher oxygen to (Y+Sm) molar ratio compared to the interior, which is achieved through controlled synthesis conditions. This local compositional differentiation enhances surface conductivity without requiring ultra-precise manufacturing, as the gradient forms naturally during synthesis.

Inventive Principle:

Principle #3Local quality

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 solid electrolyte material achieves high lithium ion conductivity of 1×10−5 S/cm or more, ensuring excellent charge and discharge characteristics in all-solid-state batteries while maintaining safety by avoiding hydrogen sulfide production.

Implementation Method 1

the solid electrolyte material has a high lithium ion conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS12463247B2Solid electrolyte material and battery using same

Publication Date: 2025.11.04 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

The solid electrolyte material of the present disclosure includes Li, Ca, Y, Sm, X, and O, where X is at least one selected from the group consisting of F, Cl, Br, and I; and the molar ratio of O to the sum of Y and Sm in a surface area of the solid electrolyte material is higher than the molar ratio of O to the sum of Y and Sm in the entire solid electrolyte material.