Sulfide Solid Electrolyte Solvent System for Low Residual Content
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Solution Overview
Problem
Existing methods for producing sulfide solid electrolytes using hydrocarbon solvents often result in insufficient reduction of residual solvent content, affecting the Li ionic conductivity of the final product.
Innovation Solution
A method involving the reaction of lithium, phosphorus, and halogen compounds in a solvent containing both hydrocarbon and ether compounds, followed by a two-stage heat treatment process to produce a sulfide glass ceramic with reduced solvent content and enhanced Li ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a hydrocarbon solvent is used for producing sulfide solid electrolyte, then the production process is simplified, but the residual solvent content in the final product is insufficiently reduced
Solution Approach 1:
The invention changes the solvent system from pure hydrocarbon to a mixed solvent system comprising hydrocarbon and ether compound. This parameter change in the solvent composition enables more effective solvent removal while maintaining production simplicity. The ether compound in the mixed solvent system facilitates better control over residual solvent content in the final sulfide solid electrolyte product.
2Ease of manufacture
If residual solvent is present in sulfide solid electrolyte, then the production process is easier, but Li ion conductivity is reduced
Solution Approach 1:
The invention modifies the solvent composition parameter by introducing an ether compound into the hydrocarbon solvent system. This change enables more effective reduction of residual solvent in the final product, thereby improving Li ion conductivity while maintaining production ease through the relatively simple mixed solvent system.
3Productivity
If organic solvent is used in sulfide solid electrolyte production, then productivity is improved, but solvent removal becomes more difficult
Solution Approach 1:
The invention changes the solvent parameter from pure organic solvent to a mixed solvent system of hydrocarbon and ether compound. This modification facilitates easier solvent removal while maintaining high productivity, as the mixed solvent system allows for more effective evaporation and reduction of residual solvent content in the final sulfide solid electrolyte product.
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 reduces solvent content in the sulfide solid electrolyte, improving Li ion conductivity and achieving a high Li ion conductive phase with minimal residual solvent, suitable for battery applications.
Implementation Method 1
heating the sulfide glass to produce a sulfide glass ceramic
Data Source
AI summary
A method for producing a sulfide glass ceramic, including reacting a lithium compound, a phosphorus compound and a halogen compound in a solvent that contains a hydrocarbon and an ether compound to produce a sulfide glass that contains a Li element, a P element, a S element and one or more halogen elements, and heating the sulfide glass to produce a sulfide glass ceramic.