Sulfide Solid Electrolyte Composite via Solution Dispersion Drying
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Solution Overview
Problem
The production of sulfide solid electrolytes is hindered by component separation and deviation due to the addition of metal compounds like tin sulfide, which have a larger specific gravity, making it difficult to homogenize the components, especially on a large scale, and also leads to hydrogen sulfide generation when exposed to moisture.
Innovation Solution
A method involving the addition of a metal compound to a sulfide solid electrolyte raw material solution, forming a dispersion liquid, removing the solvent to create a composite powder, and using this powder to produce a sulfide solid electrolyte composite through solid phase or melting methods, ensuring high homogeneity and preventing hydrogen sulfide generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal compound such as tin sulfide is added to the raw material of the sulfide solid electrolyte, then the generation of hydrogen sulfide is reduced, but the components are easily separated and deviated, making it difficult to homogenize the components
Solution Approach 1:
The patent changes the physical state parameter of the metal compound from solid powder to dissolved state in a solvent. By dissolving the metal compound in a solvent before mixing with other raw materials, the invention eliminates the density-based separation issue while maintaining the hydrogen sulfide suppression effect. After drying, the solvent is removed leaving a homogeneous distribution of metal compound particles throughout the electrolyte matrix.
Solution Approach 2:
The patent introduces a solvent as an intermediary medium to facilitate uniform distribution of the metal compound. The solvent acts as a carrier that temporarily holds the metal compound in a dispersed state during mixing, enabling homogeneous distribution. The solvent is then removed through drying, leaving the metal compound uniformly distributed in the final product without residual separation issues.
2Productivity
If the sulfide solid electrolyte is produced on a large scale, then the productivity is improved, but the component deviation becomes more significant due to easy separation of components
Solution Approach 1:
The patent changes the processing method from direct solid powder mixing to a solution-based process. By dissolving the metal compound in a solvent and then drying the solution, the invention enables large-scale production while maintaining component homogeneity. This approach allows for continuous processing and better control over component distribution even at large production volumes.
Solution Approach 2:
The patent replaces mechanical mixing of solid powders with a chemical solution-based mixing approach. Instead of relying on mechanical energy to distribute solid particles (which becomes less effective at large scales), the invention uses dissolution and evaporation processes to achieve uniform distribution, enabling scalable production without compromising homogeneity.
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 prevents hydrogen sulfide formation and achieves a sulfide solid electrolyte composite with minimal component deviation, enhancing battery performance by maintaining the metal sulfide in a dispersed and homogeneous state within the electrolyte.
Implementation Method 1
adding a metal compound to a solution containing at least one sulfide solid electrolyte raw material and dispersing the metal compound or a compound derived from the metal compound to obtain a metal dispersion liquid
Implementation Method 2
removing a solvent of the metal dispersion liquid to obtain a composite powder of the metal compound or the compound derived from the metal compound and the sulfide solid electrolyte raw material
Data Source
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AI summary
Provided is a method for producing a sulfide solid electrolyte composite, the method comprising: adding a metal compound into a solution, which contains at least one sulfide solid electrolyte raw material, and dispersing the metal compound or a compound derived from the metal compound to obtain a metal dispersion; removing a solvent from the metal dispersion to obtain a composite powder of the sulfide solid electrolyte raw material and the metal compound or a compound derived from the metal compound; and obtaining a sulfide solid electrolyte composite by using the composite powder.