Halide Solid Electrolyte Composition for Air-Stable Li-Ion Conduction
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Solution Overview
Problem
Current solid electrolyte materials for batteries, such as those using sulfide solid electrolytes, face challenges in achieving high lithium ion conductivity and safety due to the potential generation of hydrogen sulfide when exposed to air, and they often require sulfur-free alternatives with enhanced ion conductive properties.
Innovation Solution
A novel solid electrolyte material composed of Li, Yb, M, and X, where M is selected from elements like Mg, Ca, Sr, Ba, Zn, Y, Tb, Gd, Sm, In, Zr, and Hf, and X is F, Cl, Br, or I, with specific compositional formulas that enhance lithium ion conductivity and exclude sulfur, ensuring safety by preventing 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 air causing safety issues
Solution Approach 1:
The patent removes sulfur from the solid electrolyte composition entirely, extracting the harmful element that causes hydrogen sulfide generation. The electrolyte is formulated using only sulfur-free components: Li, Yb, M (metal element), and X (halogen element), eliminating the source of the harmful gas while preserving ionic conductivity through alternative chemical pathways.
Solution Approach 2:
The patent changes the chemical composition parameters by substituting sulfur-based compounds with halogen-based compounds (F, Cl, Br, I). This parameter change transforms the electrolyte from a sulfide system to a halide system, maintaining the necessary ionic conductivity while eliminating hydrogen sulfide generation risks.
2Reliability
If conventional solid electrolyte materials are used, then manufacturing is simpler, but achieving high lithium ion conductivity exceeds 5.0×10−5 S/cm is difficult
Solution Approach 1:
The patent establishes specific compositional parameters and ratios for Li, Yb, M, and halogen elements that enable high ionic conductivity. By defining precise compositional ranges and synthesis conditions, the patent makes it easier to manufacture high-performance electrolytes without requiring complex processing steps or rare materials.
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 novel solid electrolyte material achieves high lithium ion conductivity exceeding 5.0×10−5 S/cm near room temperature, providing excellent charge-discharge characteristics and safety by avoiding sulfur, thus addressing the limitations of existing sulfide-based electrolytes.
Implementation Method 1
achieves high lithium ion conductivity exceeding 5.0×10−5 S/cm near room temperature
Data Source
AI summary
A solid electrolyte material of the present disclosure contains Li, Yb, M, and X. M is at least one selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Y, Tb, Gd, Sm, In, Zr, and Hf. X is at least one selected from the group consisting of F, Cl, Br, and I. A 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.