Halogen-Doped Solid Electrolyte Composition Without H2S Release
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Solution Overview
Problem
Existing solid electrolyte materials, such as sulfide solid electrolytes, generate hydrogen sulfide when exposed to the atmosphere, posing safety concerns and limiting their effectiveness in batteries.
Innovation Solution
A novel solid electrolyte material composed of Li, Zr, Fe, and O, with X being F, Cl, Br, or I, exhibiting specific X-ray diffraction peaks and optimized molar ratios, which enhances lithium-ion conductivity and stability, avoiding sulfur content to prevent hydrogen sulfide generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte materials are used, then lithium-ion conductivity can be achieved, but hydrogen sulfide is generated when exposed to atmosphere causing safety concerns
Solution Approach 1:
The patent changes the chemical composition parameters by replacing sulfur-based electrolytes with oxygen-based electrolytes containing Li, Zr, Fe, O and halogen elements. This fundamental parameter change eliminates the hydrogen sulfide generation issue while maintaining solid electrolyte functionality, directly resolving the safety contradiction.
Solution Approach 2:
The patent employs a composite material system with specific elements (Li, Zr, Fe, O, and halogen) in optimized ratios. The combination of these elements creates a stable solid electrolyte that avoids the harmful properties of sulfide-based materials while achieving the desired lithium-ion conductivity and safety performance.
2Productivity
If solid electrolyte material composition is optimized for high lithium-ion conductivity, then charge and discharge characteristics improve, but material stability may be compromised
Solution Approach 1:
The patent optimizes specific compositional parameters including the ratio of Li to (Zr+Fe) between 0.5-2.0, O to X ratio between 0.05-0.30, and Zr to (Zr+Fe) ratio between 0.3-0.7. These parameter optimizations simultaneously achieve high lithium-ion conductivity for improved charge/discharge characteristics while maintaining material stability through the balanced composition.
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 electrolyte material achieves high lithium-ion conductivity, ensuring stable battery operation across varying temperatures and improving charge and discharge characteristics while enhancing safety by eliminating hydrogen sulfide production.
Implementation Method 1
the solid electrolyte material according to the first embodiment can have, for example, a practical lithium-ion conductivity, and has, for example, a high lithium-ion conductivity
Implementation Method 2
In an X-ray diffraction pattern obtained by X-ray diffraction measurement using a Cu-Kα ray
Implementation Method 3
a first peak is present within a range of a diffraction angle 2θ from 14.7° to 15.1°
Data Source
AI summary
A solid electrolyte material of the present disclosure includes: Li; Zr; Fe; O; and X. The X is at least one selected from the group consisting of F, Cl, Br, and I. In an X-ray diffraction pattern obtained by X-ray diffraction measurement using a Cu-Kα ray, a first peak is present within a range of a diffraction angle 2θ from 14.7° to 15.1°, a second peak is present within a range of the diffraction angle 2θ from 29.9° to 30.7°, and a third peak is present within a range of the diffraction angle 2θ from 34.1° to 34.8°.