Sulfide Solid Electrolyte Production with Enhanced Stability
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Summary
Problems
Conventional methods for producing sulfide-based solid electrolytes face challenges in achieving stable performance and homogenous dispersion of Sn due to poor solubility of SnS2 in solvents, leading to difficulties in obtaining solid electrolytes with high ion conductivity and water resistance.
Innovation solutions
A method involving the preparation of a homogeneous solution containing elemental lithium (Li), tin (Sn), and sulfur (S) in an organic solvent, followed by a drying and heat treatment process, to produce a sulfide-based solid electrolyte with improved ion conductivity and stability, using specific molar ratios and solvents to ensure effective mixing and removal of impurities.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If SnS2 is used as a raw material for synthesizing sulfide-based solid electrolyte, then the synthesis can be performed, but SnS2 has poor solubility in solvents making it difficult to homogeneously disperse Sn, resulting in impurities and unstable performance
Why choose this principle:
The invention changes the chemical form of tin from insoluble SnS2 to soluble organometallic compounds (such as tin(II) acetate, tin(IV) chloride, or tin(II) trifluoroacetate) that can be dissolved in solvents like N-methyl-2-pyrrolidone, dimethylformamide, or acetonitrile. This parameter change in the raw material's solubility enables homogeneous dispersion of Sn throughout the solid electrolyte matrix, eliminating aggregation and impurities while ensuring stable performance.
Principle concept:
If conventional ball mill or vibrating mill methods are used to react raw materials, then solid electrolyte can be produced, but the process requires extensive mechanical pulverization and has lower productivity
Why choose this principle:
The invention replaces the mechanical pulverization system (ball mill or vibrating mill) with a chemical solution-based synthesis system. By dissolving all raw materials including Sn in suitable solvents and performing hydrothermal or solvothermal reactions, the process eliminates the need for extensive mechanical grinding and mixing steps, thereby improving productivity and simplifying the manufacturing process.
Application Domain
Data Source
AI summary:
A method involving the preparation of a homogeneous solution containing elemental lithium (Li), tin (Sn), and sulfur (S) in an organic solvent, followed by a drying and heat treatment process, to produce a sulfide-based solid electrolyte with improved ion conductivity and stability, using specific molar ratios and solvents to ensure effective mixing and removal of impurities.
Abstract
A method for producing a sulfide solid electrolyte includes: preparing a uniform solution that includes at least elemental lithium (Li), elemental tin (Sn), elemental phosphorus (P), and elemental sulfur (S) in an organic solvent; removing the organic solvent from the uniform solution to obtain a precursor; and heat-treating the precursor to obtain a sulfide solid electrolyte.