Fluoride Solid Electrolyte Composition for High Li-Ion Conductivity

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Solution Overview

Problem

Existing solid electrolyte materials for batteries have low lithium ion conductivity, which limits the performance and efficiency of lithium batteries.

Innovation Solution

A solid electrolyte material composed of Li, Ti, Al, M (where M is Zr or Mg), and F, represented by the composition formula Li 6-(4-x-(4-a)y)b (Ti 1-x-y Al x M y ) b F 6, which achieves high lithium ion conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If fluoride solid electrolyte materials like LiBF4 are used, then oxidation resistance is improved, but lithium ion conductivity deteriorates

Engineering Contradiction:

Improveoxidation resistanceVSAvoidlithium ion conductivity

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent uses composite materials by combining multiple elements (Li, Ti, Al, Zr/Mg, F) in a specific ratio to create a solid electrolyte that achieves both high oxidation resistance and high lithium ion conductivity, overcoming the limitations of single-component fluoride electrolytes like LiBF4

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the compositional parameters by specifying precise molar ratios of Li:(Ti+Al+M) between 1.00-3.00 and Ti:Al:M ratios between 1:1:1 to 1:3:0, which optimizes both the oxidation resistance and lithium ion conductivity simultaneously

Inventive Principle:

Principle #35Parameter changes

2Object-generated harmful factors

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

Engineering Contradiction:

Improvelithium ion conductivityVSAvoidsafety

Core Design Contradiction:

Object-generated harmful factorsVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition from sulfide-based to fluoride-based electrolyte, specifically using Li, Ti, Al, Zr/Mg, and F elements in controlled ratios, which maintains high lithium ion conductivity while eliminating hydrogen sulfide generation and improving safety

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harm of low conductivity in fluoride electrolytes into a benefit by optimizing the compositional parameters and element ratios, achieving high conductivity without sulfur, thereby eliminating safety issues while maintaining performance

Inventive Principle:

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

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 solid electrolyte material exhibits high lithium ion conductivity of 1 × 10 -8 S/cm or more, enabling batteries with excellent charge and discharge characteristics and improved safety due to the absence of sulfur.

Implementation Method 1

a solid electrolyte material having a high lithium ion conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentEP4123745B1Solid electrolyte material and battery in which same is used

Publication Date: 2025.02.05 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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AI summary

The solid electrolyte material includes Li, Ti, Al, M, and F. Here, M is at least one selected from the group consisting of Zr and Mg.