Fluoride Solid Electrolyte Composition for Safer Lithium-Ion Conduction

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Solution Overview

Problem

Existing solid electrolyte materials, such as LiBF4, have low lithium ion conductivity and can generate hydrogen sulfide when exposed to the atmosphere, posing safety concerns and limiting their effectiveness in batteries.

Innovation Solution

A solid electrolyte material composed of Li, Ti, and F, optionally with other anions like Cl, Br, I, O, or Se, is developed, which includes a specific composition formula (Li6-4b(Ti1-xZr x)bF6) to enhance ion conductivity, and is manufactured through mechanochemical milling and heat treatment, ensuring high stability and safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If LiBF4 is used as a fluoride solid electrolyte material, then the material can be synthesized, but the lithium ion conductivity is low

Engineering Contradiction:

Improvelithium ion conductivityVSAvoidsynthesis feasibility

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical composition parameters by replacing F- anions with a mixture of F- and Cl- anions in specific ratios (0.3≤x≤0.7 in the formula Li2-aTibZrcF4-bClb). This compositional parameter change increases the lithium ion conductivity from 6.67×10^-9 S/cm for LiBF4 to 1×10^-8 S/cm or higher for the new material system, while maintaining synthesis feasibility through established solid-state reaction methods.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If sulfide solid electrolyte is used, then the material can be formed, but hydrogen sulfide is generated when exposed to the atmosphere

Engineering Contradiction:

ImprovesafetyVSAvoidhydrogen sulfide generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and eliminates sulfur from the electrolyte material composition entirely. By using a fluoride-chloride based system (Li2-aTibZrcF4-bClb) instead of sulfide-based materials, the invention removes the source of hydrogen sulfide generation while maintaining the solid electrolyte functionality and improving safety.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If conventional solid electrolyte materials are used, then the battery can operate, but oxidative stability is limited

Engineering Contradiction:

Improveoxidative stabilityVSAvoidcharge and discharge characteristics

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent creates a composite material system combining lithium (Li), titanium (Ti), zirconium (Zr), fluorine (F), and chlorine (Cl) elements in a specific stoichiometric ratio. This composite fluoride-chloride electrolyte material achieves both high oxidative stability and excellent charge-discharge characteristics, enabling the battery to operate at 4.3 V or higher without decomposition.

Inventive Principle:

Principle #40Composite materials

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 a lithium ion conductivity of 1×10−8 S/cm or more, enabling safe and efficient charge and discharge characteristics in all solid batteries, with improved energy density and output.

Implementation Method 1

a solid electrolyte material including Li, Ti, Zr, and F... having a high lithium ion conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS12609348B2Solid electrolyte material and battery using same

Publication Date: 2026.04.21 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

The solid electrolyte material includes Li, Ti, Zr, and F.