Sulfide Solid Electrolyte Mixed Solvent Production
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Solution Overview
Problem
The production of sulfide-based solid electrolytes faces challenges with hydrocarbon solvents, as reactions do not proceed easily at room temperature, and using tetrahydrofuran poses safety concerns due to its low ignition point and wide explosion limit.
Innovation Solution
A method involving a mixed solvent of hydrocarbon and polar aprotic solvents is employed, allowing for easier reaction progression and enhanced safety, eliminating the need for milling or quenching processes, and reducing the risk of explosion during drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydrocarbon solvent is used, then the reaction does not proceed easily at room temperature, but the safety is improved compared to polar aprotic solvents
Solution Approach 1:
The patent combines hydrocarbon solvent and polar aprotic solvent in a mixed solvent system. The hydrocarbon solvent provides safety benefits while the polar aprotic solvent promotes reaction progress, achieving both safety and ease of manufacture simultaneously through synergistic combination of the two solvent types.
Solution Approach 2:
The patent changes the solvent composition parameter by using a mixed solvent system with specific ratios of hydrocarbon to polar aprotic solvent. This parameter optimization allows the reaction to proceed easily while maintaining safety, resolving the contradiction between reaction progress and safety.
2Ease of manufacture
If tetrahydrofuran is used as a solvent, then the reaction proceeds easily, but safety problems occur due to low ignition point and wide explosion limit
Solution Approach 1:
The patent introduces a hydrocarbon solvent as an intermediary component in the mixed solvent system. This intermediary reduces the harmful effects of pure polar aprotic solvent by diluting it and modifying the overall solvent properties, thereby maintaining reaction progress while improving safety.
Solution Approach 2:
The patent creates a composite solvent system combining hydrocarbon and polar aprotic solvents. This composite approach allows the mixture to exhibit properties that are superior to either pure solvent alone, achieving both easy reaction progress and improved safety profile.
3Object-affected harmful factors
If hydrocarbon solvent alone is used, then safety is improved, but the reaction does not proceed easily
Solution Approach 1:
The patent merges hydrocarbon solvent with polar aprotic solvent to create a mixed solvent system that combines the safety advantages of hydrocarbon solvents with the reaction-promoting properties of polar aprotic solvents, achieving both safety and productivity.
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
This approach enables efficient production of sulfide-based solid electrolytes with improved safety and reduced risk of explosion, while maintaining high ionic conductivity and uniform surface conditions of the resulting particles.
Implementation Method 1
contacting an alkali metal sulfide with a sulfur compound in a mixed solvent of a hydrocarbon solvent and a polar aprotic solvent
Data Source
AI summary
A method of producing a sulfide-based solid electrolyte including bringing an alkali metal sulfide and a sulfur compound into contact in a mixed solvent of a hydrocarbon solvent and a polar aprotic solvent.