Halide-Substituted Solid Electrolyte for Safe Lithium-Ion Conduction
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Solution Overview
Problem
Existing solid electrolytes for all solid-state batteries, particularly those based on fluorine compounds, have improved safety but exhibit insufficient lithium-ion conductivity, limiting their performance.
Innovation Solution
A solid electrolyte composition containing A (Li, Na, or K), M (a metallic element or metalloid other than A, such as Ga or Zr), F, and X (Cl, Br, or I) is developed, with specific composition formulas like Li3MF6−aXa to enhance ion conductivity while ensuring high safety by avoiding sulfide compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid electrolytes are used, then ion conductivity is improved, but harmful factors increase (generation of toxic hydrogen sulfide gas)
Solution Approach 1:
The patent converts the harmful sulfide-based solid electrolyte into a beneficial fluorine-based solid electrolyte. By replacing sulfide with fluorine compounds containing specific metal elements, the invention eliminates the generation of toxic hydrogen sulfide gas while maintaining high ion conductivity through compositional optimization.
Solution Approach 2:
The patent introduces fluorine compounds containing specific metal elements (Ga, Zr, Mg) as intermediary materials to replace sulfide-based electrolytes. These intermediary materials serve as a bridge between the requirements for high ion conductivity and the need to eliminate harmful hydrogen sulfide gas generation, achieving both goals simultaneously.
Data Source
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.