Solid Electrolyte Layer Solvent for Stable Sulfide Film Formation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sulfide-containing solid electrolytes are reactive during film formation and can react with moisture, leading to hydrogen sulfide gas generation, which is harmful and reduces ionic conductivity, posing challenges in maintaining viscosity stability and safety in lithium batteries.
Innovation Solution
A solvent with a vapor pressure of 26.66 Pascal to 600 Pascal at 25°C, satisfying specific Hansen solubility parameters, is used to prepare a solid electrolyte layer, reducing reactivity and maintaining viscosity stability while ensuring high ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-containing solid electrolyte is used, then ionic conductivity is improved, but reactivity with moisture increases causing hydrogen sulfide gas generation
Solution Approach 1:
The patent introduces a specific solvent as an intermediary substance during film formation that mediates between the sulfide-containing solid electrolyte and moisture. This solvent creates a controlled environment that prevents direct reaction between the sulfide electrolyte and atmospheric moisture, thereby preventing hydrogen sulfide gas generation while maintaining the high ionic conductivity properties of the sulfide-based material.
Solution Approach 2:
The patent creates an inert environment by using a specifically selected solvent with controlled vapor pressure and chemical properties. This solvent forms a protective atmosphere during the film formation process that isolates the reactive sulfide-containing solid electrolyte from moisture in the air, preventing harmful chemical reactions while allowing the electrolyte to maintain its functional properties.
2Ease of manufacture
If conventional solvents are used during film formation, then processing is simplified, but viscosity stability deteriorates due to high reactivity with sulfide-containing solid electrolyte
Solution Approach 1:
The patent applies parameter changes by carefully selecting a solvent with specific physical and chemical parameters: vapor pressure between 0.2-4.5 mmHg at 25°C, and Hansen solubility parameters within specific ranges (δ: 16.4-18.2 MPa^1/2, δD: 15-18.2 MPa^1/2, δP: 0-4 MPa^1/2, δH: 0-6 MPa^1/2). These parameter optimizations ensure the solvent maintains appropriate viscosity stability during film formation while being compatible with sulfide-containing solid electrolyte.
Solution Approach 2:
The patent introduces a specifically selected solvent as an intermediary that facilitates the film formation process while maintaining viscosity stability. This solvent acts as a bridge between the processing requirements and the chemical stability needs of sulfide-containing solid electrolyte, enabling easy manufacturing without compromising composition stability.
3Productivity
If solvent with higher vapor pressure is used, then evaporation is faster improving film formation speed, but reactivity with sulfide-containing solid electrolyte increases
Solution Approach 1:
The patent optimizes the vapor pressure parameter of the solvent to a specific range (0.2-4.5 mmHg at 25°C) that balances evaporation rate with chemical stability. This parameter optimization ensures sufficiently fast film formation speed while maintaining low reactivity with sulfide-containing solid electrolyte, preventing harmful side reactions during the processing window.
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 solvent allows for stable viscosity and excellent film forming characteristics, maintaining high ionic conductivity and safety in lithium batteries by minimizing reactivity with sulfide-containing solid electrolytes.
Implementation Method 1
the solvent has a vapor pressure of about 26.66 Pascal to about 600 Pascal at 25° C.
Data Source
AI summary
A solvent for preparing a solid electrolyte layer, wherein the solvent has a vapor pressure of about 26.66 Pascal to about 600 Pascal at 25° C., and wherein the solvent satisfies Equation 1:δ2=(δD)2+(δP)2+(δH)2 Equation 1wherein δ is a Hansen solubility parameter, and δ is about 16.4 MPa1/2 to about 18.2 MPa1/2, δD is a dispersion energy parameter, and δD is about 15 MPa1/2 to about 18.2 MPa1/2, δP is a polar-dipolar energy parameter, and δP is about 0 MPa1/2 to about 4 MPa1/2, and δH is a hydrogen bonding energy parameter, and δH is about 0 MPa1/2 to about 6 MPa1/2.