Sulfide Solid Electrolyte Synthesis Using Catalytic-Spectator Solvents
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Solution Overview
Problem
The production of solid electrolytes, particularly those with an Argyrodite phase, is a time-consuming process, and there is a need for more efficient methods to meet increasing demand while minimizing impurities and optimizing ionic conductivity.
Innovation Solution
A method involving the mixing of alkali or alkaline earth metal sulfides, secondary sulfides, and optionally alkali halides in a blend of solvents comprising a catalytic solvent and a spectator solvent, followed by crystallization, which can include heating and milling, to produce sulfide-based solid electrolytes with enhanced purity and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional solid electrolyte production methods are used, then the process is simple, but the production time is excessively long
Solution Approach 1:
A coordinating solvent is introduced as an intermediary substance during the mixing of precursor materials. The solvent coordinates with metal ions to form soluble complexes, enabling rapid homogeneous mixing and reaction. This intermediary facilitates the transformation from slow solid-state reaction to fast solution-phase reaction, dramatically reducing production time from days to hours while maintaining process simplicity.
Solution Approach 2:
The method changes the chemical environment parameters by introducing a coordinating solvent that alters the reaction mechanism. The solvent's coordination capability changes the solubility and reactivity parameters of precursor materials, enabling the system to proceed through a different reaction pathway that is much faster than traditional solid-state sintering.
2Manufacturing precision
If traditional production methods are used, then fewer process steps are required, but impurity levels are high
Solution Approach 1:
The coordinating solvent acts as a purification intermediary by selectively coordinating with target metal ions while leaving impurities in the solid phase. This selective coordination enables separation of desired products from impurities during the mixing process itself, achieving high purity without requiring additional complex purification steps.
Solution Approach 2:
The method replaces mechanical mixing and physical separation methods with chemical coordination mechanisms. Instead of relying on physical processes for purification, the chemical interaction between the coordinating solvent and metal ions provides selective separation, achieving higher purity through chemical selectivity rather than mechanical means.
3Reliability
If traditional production methods are used, then the process is straightforward, but ionic conductivity is insufficient
Solution Approach 1:
The coordinating solvent changes the local chemical environment around metal ions, altering parameters such as coordination geometry, bond strength, and ion mobility. These parameter changes lead to the formation of solid electrolytes with optimized crystal structures that exhibit superior ionic conductivity compared to traditionally synthesized materials.
Solution Approach 2:
The method creates local quality improvements by using the coordinating solvent to establish specific coordination environments around metal ions during synthesis. This local chemical environment control leads to more uniform and defect-free crystal structures, enhancing the bulk ionic conductivity properties of the final solid electrolyte material.
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 method significantly reduces production time, achieves higher purity, and increases ionic conductivity by up to 25% compared to traditional methods, with the sulfide-based solid electrolytes exhibiting improved crystalline phase stability and reduced impurity levels.
Implementation Method 1
mixing occurs in a blend of solvents comprising a coordinating solvent and a non-coordinating non-reactive solvent
Implementation Method 2
the sulfide-based solid electrolyte is heated to a temperature of about 350° C. to about 550° C.
Implementation Method 3
the method further comprises milling the mixture
Implementation Method 4
drying the sulfide-based solid electrolyte under vacuum or atmospheric pressure
Implementation Method 5
crystallizing the sulfide-based solid electrolyte
Data Source
AI summary
Provided herein are methods for synthesizing sulfide-based solid electrolytes, including those with an Argyrodite phase. The methods generally comprise mixing electrolyte precursors in a blend of solvents comprising a catalytic solvent and a spectator solvent.