Li-Y-I Solid Electrolyte Crystallinity for Heat-Resistant Batteries
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Solution Overview
Problem
Solid electrolyte materials containing iodine face a challenge in maintaining heat resistance as their crystallinity decreases, leading to reduced performance in battery applications.
Innovation Solution
A solid electrolyte material composed of Li, Y, and I, with a specific X-ray diffraction pattern peak half-value width of less than 0.89°, is developed to enhance heat resistance and ion conductivity, and is sulfur-free to prevent hydrogen sulfide generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the crystallinity of the solid electrolyte material is decreased, then the ion conductivity is improved, but the heat resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the half value width of the XRD peak (a structural parameter) to be 0.89° or less, which corresponds to a specific crystallinity level. This optimized parameter range achieves the balance between maintaining sufficient ion conductivity and ensuring adequate heat resistance, resolving the contradiction between these two properties.
2Reliability
If the crystallinity of the solid electrolyte material is decreased, then the ion conductivity is improved, but the structural stability deteriorates
Solution Approach 1:
The patent utilizes parameter changes by defining a specific range for the half value width of the XRD peak (0.89° or less), which represents an optimized crystallinity parameter. This controlled parameter change enables the material to achieve high ion conductivity while maintaining adequate structural stability, resolving the contradiction between these two properties.
3Reliability
If sulfur is included in the solid electrolyte material, then the ion conductivity is improved, but hydrogen sulfide generation occurs
Solution Approach 1:
The patent applies the extraction principle by completely removing sulfur from the solid electrolyte material composition. This elimination of the harmful element (sulfur) prevents hydrogen sulfide generation while maintaining ion conductivity through alternative material design using iodine-based compounds, thus resolving the contradiction between ion conductivity 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 material exhibits improved heat resistance and charge/discharge characteristics, maintaining ion conductivity even at elevated temperatures, and is safer due to the absence of sulfur, which prevents hydrogen sulfide formation.
Implementation Method 1
a solid electrolyte material including Li, Y, and I, wherein in an X-ray diffraction pattern of the solid electrolyte material obtained by X-ray diffraction measurement using Cu-Kα rays, the peak with the highest intensity among the peaks present in a diffraction angle 2θ range of greater than or equal to 25.0° and less than or equal to 29.1° has a half value width of less than 0.89°
Implementation Method 2
in an X-ray diffraction pattern of the solid electrolyte material obtained by X-ray diffraction measurement using Cu-Kα rays
Implementation Method 3
in an X-ray diffraction pattern of the solid electrolyte material obtained by X-ray diffraction measurement using Cu-Kα rays
Data Source
AI summary
The solid electrolyte material of the present disclosure is a solid electrolyte material including Li, Y, and I, wherein in an X-ray diffraction pattern of the solid electrolyte material obtained by X-ray diffraction measurement using Cu-Kα rays, the peak having the highest intensity among the peaks present in a diffraction angle 2θ range of greater than or equal to 25.0° and less than or equal to 29.1° has a half value width of less than 0.89°. The battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer disposed between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte material of the present disclosure.