Sulfide Solid Electrolyte Slurry Cooling to Preserve Ionic Conductivity
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Solution Overview
Problem
The challenge in producing sulfide solid electrolytes is maintaining high ionic conductivity during mass-scale production, as specific components like lithium and halogen elements tend to separate, reducing conductivity, especially in heterogeneous methods where uniform dispersion is difficult.
Innovation Solution
A method involving mixing solid electrolyte raw materials containing lithium, sulfur, phosphorus, and halogen elements with a complexing agent to form a complex slurry, which is then cooled and stored to prevent separation of specific components, maintaining their dispersion and enhancing ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a heterogeneous method using slurry is employed in mass-scale production, then productivity is improved, but separation of specific components occurs reducing ionic conductivity
Solution Approach 1:
A complexing agent is introduced as an intermediary substance that forms complexes with specific components (lithium and halogen elements) in the slurry. This prevents direct separation of these components while maintaining the heterogeneous slurry state, thereby preserving ionic conductivity during mass-scale production. The complexing agent acts as a mediator that binds problematic components together, preventing their separation.
2Reliability
If cooling treatment is applied to complex slurry, then separation of specific components is suppressed maintaining high ionic conductivity, but additional processing steps are required
Solution Approach 1:
Temperature is used as a control parameter to suppress component separation. By cooling the complex slurry to specific temperature ranges, the solubility and stability of the complex formed by the complexing agent are optimized, preventing separation of lithium and halogen elements. This parameter change (temperature control) provides a simple and effective method to maintain ionic conductivity without requiring complex additional processing equipment.
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 the production of sulfide solid electrolytes with high ionic conductivity by preventing the separation of critical components, thus ensuring consistent performance even in mass-scale production.
Implementation Method 1
a complex slurry containing a complex formed of the solid electrolyte raw material and the complexing agent
Implementation Method 2
the complex slurry is transferred to an intermediate tank equipped with a cooling device and cooled therein
Data Source
AI summary
Disclosed is a method for producing a sulfide solid electrolyte including a step of processing a slurry by at least one treatment selected from drying and heating, wherein a solid electrolyte raw material containing a lithium element, a sulfur element, a phosphorus element and a halogen element, and a complexing agent are mixed in a reactor to give a complex slurry containing a complex formed of the solid electrolyte raw material and the complexing agent, and the complex slurry is transferred into an intermediate tank equipped with a cooling device and cooled therein.