Sulfide Solid Electrolyte Composition to Reduce H2S Gas Generation
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Solution Overview
Problem
Sulfide-based solid electrolytes used in lithium secondary batteries face challenges due to the generation of toxic hydrogen sulfide gas when reacting with moisture, limiting their safety and performance.
Innovation Solution
A new sulfide-based solid electrolyte with a monoclinic crystal structure, represented by the Formula Li2ABS4X2, where A can be indium, aluminum, gallium, scandium, or yttrium, and B can be phosphorus or antimony, with X being chlorine, bromine, or iodine, is developed. This electrolyte exhibits high lithium ion conductivity and minimizes hydrogen sulfide gas generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid electrolytes are used to achieve high lithium ion conductivity, then battery performance is improved, but toxic hydrogen sulfide gas is generated when reacting with moisture
Solution Approach 1:
The patent modifies the chemical composition parameters of the sulfide-based solid electrolyte by incorporating specific ratios of Li2S, In2S3, P2S5, and halide compounds (LiCl, LiBr, or LiI). This compositional parameter change enables the material to maintain high lithium ion conductivity while reducing the generation of hydrogen sulfide gas through controlled chemical reactions with moisture.
Solution Approach 2:
The patent creates a composite sulfide-based solid electrolyte material by combining multiple components: lithium sulfide (Li2S), indium sulfide (In2S3), phosphorus pentasulfide (P2S5), and halide compounds. This composite structure leverages the synergistic effects of each component to achieve both high ionic conductivity and reduced harmful gas generation.
2Reliability
If conventional sulfide-based solid electrolytes are used, then high energy density is achieved, but safety issues arise due to electrolyte leakage and fire risk
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to solid by developing a sulfide-based solid electrolyte with specific compositional parameters (Li2S-In2S3-P2S5-halide system). This parameter change eliminates electrolyte leakage and fire risks associated with liquid electrolytes while preserving high energy density through maintained ionic conductivity.
3Object-generated harmful factors
If sulfide-based solid electrolytes are substituted to reduce hydrogen sulfide generation, then safety is improved, but crystal structure limits prevent optimal performance
Solution Approach 1:
The patent develops a composite sulfide-based solid electrolyte with a specific multi-component composition (Li2S-In2S3-P2S5-halide) that forms a new crystal structure. This composite approach allows the material to reduce hydrogen sulfide generation while achieving optimal ionic conductivity by creating a crystal structure specifically tailored to this composition system.
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 sulfide-based solid electrolyte achieves improved safety and performance by maintaining high lithium ion conductivity while significantly reducing the generation of hydrogen sulfide gas, thus enhancing the stability and efficiency of lithium secondary batteries.
Implementation Method 1
The sulfide-based solid electrolytes have advantages of high lithium ion conductivity
Implementation Method 2
the sulfide-based solid electrolytes have a problem of generating toxic hydrogen sulfide (H2S) gas by reacting with moisture in the air
Data Source
AI summary
The present disclosure relates to a sulfide-based solid electrolyte having a new composition and a new crystal structure.