Fluoride Solid Electrolyte Composition for Conductive Safer Batteries
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Solution Overview
Problem
Existing solid electrolyte materials for batteries, such as LiBF4, have low lithium ion conductivity and may generate hazardous gases like hydrogen sulfide when exposed to the atmosphere.
Innovation Solution
A solid electrolyte material composed of Li, Ti, M (where M is Mg or Ca), and F, which achieves high lithium ion conductivity of 1×10−8 S/cm or more, and does not contain sulfur to prevent hydrogen sulfide generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LiBF4 is used as a fluoride solid electrolyte material, then the battery can operate with solid electrolyte, but the lithium ion conductivity is low
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating Li, Ti, M (Mg or Ca), and F elements in specific ratios. This compositional parameter change achieves high lithium ion conductivity (1×10−8 S/cm or more) while eliminating sulfur content to prevent hydrogen sulfide generation.
Solution Approach 2:
The patent creates a composite solid electrolyte material combining multiple elements (Li, Ti, M where M is Mg or Ca, and F) in a specific structure. This composite approach achieves both high ionic conductivity and chemical stability, resolving the contradiction between performance and safety.
2Reliability
If sulfide solid electrolyte is used, then the battery can function with solid electrolyte, but hazardous hydrogen sulfide gas is generated when exposed to atmosphere
Solution Approach 1:
The patent extracts and eliminates sulfur from the solid electrolyte composition, removing the source of hydrogen sulfide generation. The fluoride-based composition (Li-Ti-M-F) maintains ionic conductivity functionality without the harmful sulfur component.
Solution Approach 2:
The patent changes the chemical composition from sulfur-based to fluorine-based electrolyte, fundamentally altering the material parameters to eliminate hydrogen sulfide generation while maintaining electrochemical performance.
3Productivity
If conventional solid electrolyte materials are used, then the battery structure can be simplified, but the charge and discharge characteristics are poor
Solution Approach 1:
The patent optimizes the compositional parameters of the solid electrolyte (ratios of Li, Ti, M, and F) to achieve high ionic conductivity, which directly improves charge and discharge characteristics while maintaining safety through sulfur-free composition.
Solution Approach 2:
The patent develops a composite fluoride-based solid electrolyte material that simultaneously achieves high ionic conductivity for improved productivity and inherent safety through the absence of sulfur, resolving the contradiction between performance and safety.
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 proposed solid electrolyte material enhances the charge and discharge characteristics of batteries, provides improved safety by avoiding hydrogen sulfide generation, and maintains high resistance to oxidation.
Implementation Method 1
a solid electrolyte material having a high lithium ion conductivity
Data Source
AI summary
The solid electrolyte material consists essentially of Li, Ti, M, and F. Here, M is at least one selected from the group consisting of Mg and Ca.