Sulfide Solid Electrolyte Processing to Prevent Raw Material Loss
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Solution Overview
Problem
Conventional liquid-phase methods for producing sulfide solid electrolytes face challenges in achieving high production efficiency due to raw material separation and loss, leading to reduced ionic conductivity and quality of the sulfide solid electrolyte.
Innovation Solution
A method involving the use of a first solvent to prepare a mixture with raw materials, followed by mixing with a second solvent to form a solid electrolyte precursor, and subsequent heat treatment with hydrogen sulfide to produce a heated precursor before firing, effectively suppressing raw material separation and loss, and enhancing the formation of an argyrodite-type crystal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional liquid-phase methods are used to produce sulfide solid electrolytes, then the production process is simplified and mass production is enabled, but raw material separation and loss occur leading to reduced ionic conductivity and quality
Solution Approach 1:
The patent introduces a complexing agent as an intermediary substance that forms a complex with raw materials in the liquid phase. This complex prevents raw material separation and loss during the production process, thereby maintaining high ionic conductivity while enabling mass production through simplified liquid-phase processing
Solution Approach 2:
The patent modifies the chemical parameters of the production system by introducing a complexing agent that changes the solubility and reactivity parameters of raw materials. This parameter change prevents precipitation and separation issues, allowing mass production while maintaining product quality and ionic conductivity
2Adaptability or versatility
If conventional liquid-phase methods are used to produce sulfide solid electrolytes, then versatility and applicability are enhanced, but raw material loss occurs reducing production efficiency
Solution Approach 1:
The complexing agent serves as a mediator that keeps raw materials in solution during the liquid-phase process, preventing loss through precipitation or separation. This maintains the versatility of the liquid-phase method while eliminating raw material loss
Solution Approach 2:
The complexing agent is introduced in advance to form stable complexes with raw materials before any separation or processing occurs. This preliminary action prevents raw material loss throughout the entire production process while maintaining method versatility
3Ease of manufacture
If raw materials are not completely dissolved in liquid-phase methods, then a suspension can be used, but this leads to raw material separation and reduced production efficiency
Solution Approach 1:
The complexing agent acts as an intermediary that enables complete dissolution of raw materials in the liquid phase, eliminating the need for suspension processing. This resolves the contradiction by achieving both ease of manufacture through liquid-phase processing and high production efficiency by preventing separation
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 method enhances production efficiency and quality of the sulfide solid electrolyte by minimizing raw material separation and loss, resulting in a high-quality sulfide solid electrolyte with improved ionic conductivity and reduced impurities.
Implementation Method 1
subjecting the solid electrolyte precursor to a heat treatment while supplying hydrogen sulfide to produce a heated solid electrolyte precursor
Implementation Method 2
firing the heated solid electrolyte precursor
Data Source
AI summary
Provided is a method for producing a sulfide solid electrolyte having an argyrodite-type crystal structure in a liquid phase, the method having a production efficiency enhanced by efficiently using a raw material-containing substance and enabling easy production of a high-quality sulfide solid electrolyte, the method including mixing a raw material-containing substance and a first solvent to prepare a mixture, mixing the mixture and a second solvent to prepare a solution containing a solid electrolyte precursor, subjecting the solid electrolyte precursor to a heat treatment while supplying hydrogen sulfide to produce a heated solid electrolyte precursor, and firing the heated solid electrolyte precursor.