Li-Zr-Al-F Solid Electrolyte for Heat-Resistant Battery Operation
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Solution Overview
Problem
Existing solid electrolyte materials lack sufficient heat resistance and ion conductivity, particularly in high-temperature battery applications, and may produce hazardous substances like hydrogen sulfide when exposed to the atmosphere.
Innovation Solution
A solid electrolyte material composed of a crystal phase containing Li, Zr, and F, with specific X-ray diffraction patterns and a crystal structure that provides high heat resistance and improved lithium-ion conductivity, while being sulfur-free to prevent hydrogen sulfide production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte materials (sulfide or fluoride-based) are used, then ion conductivity can be achieved, but heat resistance is insufficient and hazardous substances like hydrogen sulfide may be produced
Solution Approach 1:
The patent changes the chemical composition parameters by using Li, Zr, Al, and F elements in specific ratios (0.1≤x≤0.6, 0.1≤y≤0.6, z=1-x-y) to form a new crystal phase that inherently resists heat degradation and prevents hydrogen sulfide generation, fundamentally altering the material's thermal and chemical stability parameters
Solution Approach 2:
The patent creates a composite crystal phase combining multiple elements (Li, Zr, Al, F) with specific structural characteristics, where the synergistic combination of these elements produces a material that simultaneously achieves high heat resistance, ion conductivity, and safety by eliminating harmful sulfide components
2Reliability
If sulfur-containing solid electrolyte materials are used, then ion conductivity can be improved, but hazardous hydrogen sulfide is produced when exposed to atmosphere
Solution Approach 1:
The patent extracts and eliminates sulfur from the electrolyte material composition entirely, replacing it with a sulfur-free Li-Zr-Al-F crystal phase that maintains ion conductivity through fluoride-based ionic pathways while completely preventing hydrogen sulfide generation
Solution Approach 2:
The patent converts the potential harm of using conventional sulfide electrolytes by developing a fluoride-based alternative that achieves comparable or superior ion conductivity without the harmful byproduct, turning the limitation into a safety advantage
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 material exhibits enhanced heat stability and ion conductivity, supporting efficient charge/discharge characteristics in batteries and ensuring safety by avoiding hydrogen sulfide generation.
Implementation Method 1
a solid electrolyte material containing a crystal phase containing Li, Zr, Al, and F
Implementation Method 2
an X-ray diffraction pattern of the solid electrolyte material obtained by X-ray structure analysis using Cu-Kα radiation
Implementation Method 3
an X-ray diffraction pattern of the solid electrolyte material obtained by X-ray structure analysis using Cu-Kα radiation has at least two peaks in a first range of diffraction angle 2θ from 21.2° to 23.5°
Data Source
AI summary
A solid electrolyte material according to the present disclosure includes a crystal phase containing Li, Zr, Al, and F. The X-ray diffraction pattern of the solid electrolyte material obtained by X-ray structure analysis using Cu-Kα radiation has at least two peaks in a first range of diffraction angle 2θ from 21.2° to 23.5°, at least two peaks in a second range of diffraction angle 2θ from 29.3° to 31.8°, and at least two peaks in a third range of diffraction angle 2θ from 37° to 40.3°.