Sulfide Solid Electrolyte Slurry Using Fluorinated Milling Solvents
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Solution Overview
Problem
The production of sulfide solid electrolytes using conventional solvents like toluene and heptane is challenging due to their handling difficulties and environmental impact, necessitating a safer and more environmentally friendly alternative.
Innovation Solution
A method involving the mixing of lithium, phosphorus, and sulfur sources, followed by firing and milling with a solvent containing fluorine atoms, which enhances lithium ion conductivity and reduces environmental burden by using fluorine-based solvents for wet milling, thereby producing a sulfide solid electrolyte with improved safety and reduced environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solvents like toluene or heptane are used for forming sulfide solid electrolyte slurries, then the sulfide solid electrolyte can be successfully formed, but the handling becomes difficult and environmental burden increases due to flammability and toxicity
Solution Approach 1:
The patent changes the chemical composition parameter of the solvent from conventional hydrocarbons (toluene, heptane) to fluorinated solvents (perfluorinated solvents). This parameter change maintains the solvent's ability to disperse sulfide particles while dramatically improving safety properties - fluorinated solvents have higher flash points and lower flammability, thus resolving the contradiction between formability and handling safety
Solution Approach 2:
The patent uses composite solvent systems combining fluorinated solvents with other compatible solvents to achieve both good dispersibility of sulfide particles and improved safety profile. The composite solvent system leverages the advantages of different solvent components while mitigating their individual disadvantages, particularly the flammability issues of conventional organic solvents
2Reliability
If conventional solvents like toluene or heptane are used for forming sulfide solid electrolyte slurries, then the sulfide solid electrolyte can be successfully formed, but environmental burden increases
Solution Approach 1:
The patent changes the chemical parameter of the solvent to fluorinated compounds, which have different environmental characteristics compared to conventional hydrocarbon solvents. Fluorinated solvents generally exhibit lower volatility and different biodegradation profiles, reducing environmental burden while maintaining the necessary formability of sulfide solid electrolyte
Solution Approach 2:
The patent converts the traditionally problematic aspect of fluorinated solvents (potential persistence in environment) into a benefit by carefully selecting specific fluorinated compounds that balance environmental stability with controlled degradation, while eliminating the harmful flammability and toxicity associated with conventional solvents like toluene
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 method effectively produces a sulfide solid electrolyte with enhanced lithium ion conductivity and improved safety, using fluorine-based solvents that are less flammable and safer for handling, while minimizing environmental impact.
Implementation Method 1
using a solvent having fluorine atoms (a fluorine-based solvent) instead of a conventional solvent, wet milling is performed
Data Source
AI summary
A method for producing a sulfide solid electrolyte includes: a step of mixing a lithium (Li) element source, a phosphorus (P) element source, and a sulfur (S) element source, thereby obtaining a raw material composition; a step of firing the raw material composition, thereby obtaining a sulfide; a step of milling a slurry containing a solvent having fluorine atoms and the sulfide; and a step of drying the slurry. The sulfide in the slurry preferably has a concentration of 3 to 40 mass %. The step of milling a slurry is preferably a step of dry milling the sulfide, and mixing the dry milled sulfide and the solvent, thereby preparing the slurry.