Halide Solid Electrolyte Eliminates Hydrogen Sulfide
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Solution Overview
Problem
Current solid electrolyte materials, such as sulfide solid electrolytes, pose safety risks due to the potential generation of hydrogen sulfide when exposed to the atmosphere, and they often have limited ionic conductivity, which affects the performance of all-solid-state batteries.
Innovation Solution
A novel solid electrolyte material composed of Li, DC (Mg, Ca, Sr, Ba, or Zn), Y, and X (F, Cl, Br, or I) with specific composition ratios, which provides high lithium-ion conductivity and is substantially free of sulfur, enhancing safety and performance in all-solid-state batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte materials are used, then ionic conductivity can be achieved, but safety risks arise due to hydrogen sulfide generation when exposed to atmosphere
Solution Approach 1:
The patent removes sulfur from the solid electrolyte composition entirely, extracting the harmful element that causes hydrogen sulfide generation. The new composition uses only halide-based compounds (Li, DC, Y, Sm, and X where X is F, Cl, Br, or I), completely eliminating the source of hydrogen sulfide while maintaining ionic conductivity functionality.
Solution Approach 2:
The patent creates a composite halide-based solid electrolyte material combining multiple elements (Li, DC, Y, Sm, and halogen X) in specific compositional ratios. This composite approach achieves high ionic conductivity without sulfur, resolving the contradiction between functionality and safety by designing a new material system with inherently safer chemical properties.
2Reliability
If conventional solid electrolyte materials are used, then battery operation is possible, but ionic conductivity is limited affecting battery performance
Solution Approach 1:
The patent optimizes specific compositional parameters within defined ranges (a: 0.05-0.50, b: 0.10-0.60, c: 1.50-3.00, d: 0.01-0.10) to achieve high ionic conductivity. By precisely controlling the ratios of Li, DC, Y, Sm, and halogen X, the material achieves superior ionic conductivity that directly improves battery charge and discharge characteristics.
Solution Approach 2:
The patent introduces rare earth elements (Y and Sm) at specific compositional levels to enhance local structural properties that facilitate lithium ion transport. This localized optimization of material composition creates favorable pathways for ion conduction, improving overall ionic conductivity without compromising structural integrity.
3Object-generated harmful factors
If sulfur-free solid electrolyte material is used, then safety is improved by eliminating hydrogen sulfide generation, but material composition complexity increases
Solution Approach 1:
The halogen element X serves multiple functions simultaneously: it maintains structural stability, enables ionic conductivity, and ensures safety by being non-hydrogen sulfide-generating. This multi-functional design simplifies the overall material system compared to sulfur-based alternatives, as a single element substitution (sulfur to halogen) resolves both conductivity and safety requirements.
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 ionic conductivity of 1×10−5 S/cm or more near room temperature, improving charge and discharge characteristics of batteries while being free of sulfur, thus eliminating safety hazards associated with hydrogen sulfide generation.
Implementation Method 1
the solid electrolyte material has high lithium-ion conductivity, and is substantially free of sulfur
Data Source
AI summary
A solid electrolyte material according to the present disclosure includes Li, DC, Y, Sm, and X. The DC is at least one selected from the group consisting of Mg, Ca, Sr, Ba, and Zn. The X is at least one selected from the group consisting of F, Cl, Br, and I. A battery according to the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer provided 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 includes the solid electrolyte material according to the present disclosure.