Halide Solid Electrolyte for All-Solid-State Battery Safety

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Solution Overview

Problem

Existing solid electrolyte materials for all-solid-state batteries face challenges in lithium ion conductivity and safety due to the production of hydrogen sulfide, which affects charge and discharge characteristics and safety.

Innovation Solution

A solid electrolyte material composed of Li, Y, and at least one selected from Mg, Ca, Sr, Ba, Zn, Sc, La, Sm, Bi, Zr, Hf, Nb, and Ta, combined with Cl, Br, or I, exhibiting specific X-ray diffraction patterns that enhance lithium ion conductivity and prevent hydrogen sulfide production, thereby improving battery safety and performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sulfide solid electrolyte materials are used in all-solid-state batteries, then the batteries can achieve solid electrolyte functionality, but hydrogen sulfide is produced which affects safety and charge-discharge characteristics

Engineering Contradiction:

Improvebattery safetyVSAvoidhydrogen sulfide production

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 (Li3YCl6, Li3YBr6, or their mixed crystals). This fundamental parameter change eliminates the hydrogen sulfide production issue while maintaining solid electrolyte functionality, directly resolving the safety contradiction.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful sulfur-containing compounds into beneficial halide compounds. By this material substitution, the harmful hydrogen sulfide production is eliminated and replaced with a safer chemical system that provides superior electrochemical stability and safety performance.

Inventive Principle:

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

2Reliability

If existing solid electrolyte materials are used, then the battery structure can be established, but lithium ion conductivity is insufficient which affects charge and discharge characteristics

Engineering Contradiction:

Improvecharge-discharge characteristicsVSAvoidlithium ion conductivity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent employs composite material strategy by creating mixed crystals of Li3YCl6 and Li3YBr6. This composite approach allows tuning of lithium ion conductivity through controlled mixing ratios, achieving optimal charge-discharge characteristics by combining the advantages of both chloride and bromide components.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the stoichiometric composition parameters of the halide solid electrolyte system. By precisely controlling the Li:Y:halide ratio and the Cl:Br mixing ratio, the patent achieves maximum lithium ion conductivity while maintaining structural stability, thereby improving charge-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 material achieves high lithium ion conductivity and superior charge and discharge characteristics while ensuring safety by avoiding hydrogen sulfide production, enabling efficient operation of all-solid-state secondary batteries.

Implementation Method 1

a halide solid electrolyte material, which is a solid electrolyte material highly conductive to lithium ions

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 2

An X-ray diffraction pattern of the solid electrolyte material obtained by using Cu-Kα radiation as the X-ray source includes peaks

Methodology Applied

Scientific EffectX-ray diffraction: X-Ray

Implementation Method 3

An X-ray diffraction pattern of the solid electrolyte material obtained by using Cu-Kα radiation as the X-ray source includes peaks within the range in which the diffraction angle 2θ is 25° or more and 35° or less

Methodology Applied

Scientific EffectBragg diffraction: Bragg Diffraction

Data Source

PatentUS11498849B2Solid electrolyte material and battery

Publication Date: 2022.11.15 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A solid electrolyte material contains Li, Y, at least one selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Sc, La, Sm, Bi, Zr, Hf, Nb, and Ta, and at least one selected from the group consisting of Cl, Br, and I. An X-ray diffraction pattern of the solid electrolyte material obtained by using Cu-Kα radiation as the X-ray source includes peaks within the range in which the diffraction angle 2θ is 25° or more and 35° or less, and also includes at least one peak within the range in which the diffraction angle 2θ is 43° or more and 51° or less.