Halide-Fluoride Solid Electrolyte for Safe Li-Ion Conduction
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Solution Overview
Problem
Existing solid electrolytes made of fluorine compounds exhibit insufficient lithium-ion conductivity and do not address the safety concerns associated with moisture reactivity, leading to the generation of toxic hydrogen sulfide gas.
Innovation Solution
A solid electrolyte composed of A, M, and X, where A is Li, Na, or K, M is a metallic or metalloid element, and X is Cl, Br, or I, with a composition formula of A 3 MF 6-a X a, which enhances ion conductivity and avoids the use of sulfides to prevent hydrogen sulfide gas generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolytes are made of sulfides to improve ion conductivity, then lithium-ion conductivity is improved, but harmful factors worsen due to hydrogen sulfide gas generation
Solution Approach 1:
The invention extracts and eliminates sulfur from the electrolyte composition entirely, replacing sulfide-based materials with fluorine-chlorine compound-based materials (A3-b+cMα1-b-cMβbMγcF6-aXa), thereby removing the source of hydrogen sulfide gas generation while maintaining high ion conductivity
Solution Approach 2:
The invention converts the harmful moisture-reactive property of sulfides into a beneficial non-reactive fluorine-chlorine compound system that does not generate toxic gases upon contact with moisture, transforming a harmful material class into a safe one while preserving conductivity
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 achieves high ion conductivity, exceeding 1 × 10 -5 S/cm, while ensuring safety by eliminating the production of toxic gases, thus improving the performance of all solid-state batteries.
Implementation Method 1
their lithium-ion conductivities are of the order of 10^-6 S/cm... achieves high ion conductivity, exceeding 1 × 10^-5 S/cm
Data Source
Figure 1~2
AI summary
A solid electrolyte contains A, M, F, and X. A is at least one element selected from a group consisting of Li, Na, and K. M is a metallic element(s) other than A or a metalloid element(s). X is at least one element selected from a group consisting of Cl, Br, and I. This provides the solid electrolyte with high safety and high ion conductivity.