Crystalline Sulfide Solid Electrolyte with Complex-Assisted Drying
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Solution Overview
Problem
Existing methods for producing solid electrolytes using the liquid phase method face challenges in achieving high ionic conductivity due to component decomposition, separation issues, and solvent affinity problems.
Innovation Solution
A method involving the use of two specific complexing agents, one capable of forming Li3PS4 and a complex containing a halogen atom, and another capable of forming a complex containing Li3PS4, along with an instant drying step by contact with a medium, to produce a crystalline sulfide solid electrolyte with improved ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a liquid phase method is used to produce solid electrolyte, then the production process is simplified and productivity is improved, but component decomposition and separation occur leading to reduced manufacturing precision
Solution Approach 1:
The patent introduces a complexing agent as an intermediary substance that coordinates with metal ions to form stable complexes during the liquid phase synthesis. This complexing agent prevents premature precipitation and decomposition of components, maintaining uniform distribution of Li3PS4 and other components throughout the drying process, thereby achieving high manufacturing precision while preserving the productivity benefits of the liquid phase method.
2Loss of substance
If conventional drying methods are used, then the solvent is removed, but component elution occurs reducing the purity and ionic conductivity of the solid electrolyte
Solution Approach 1:
The patent applies beforehand cushioning by pre-forming stable complexes between the complexing agent and metal ions before the drying process begins. These pre-formed complexes act as protective structures that prevent component elution during solvent removal. The complexed components remain stable throughout the drying process, eliminating the need for post-drying purification and ensuring high purity and ionic conductivity in the final product.
3Stability of the object's composition
If homogeneous dissolution is achieved in liquid phase method, then mixing is improved, but solvent affinity problems cause component separation during drying
Solution Approach 1:
The patent employs parameter changes by modifying the chemical environment through the addition of complexing agents. This changes the solubility parameters and coordination chemistry of the system, allowing components to remain in a stable complexed state during drying. The parameter change from simple dissolution to complexation prevents solvent affinity-driven separation, maintaining both mixing uniformity and component retention throughout the process.
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 achieves a crystalline sulfide solid electrolyte with enhanced ionic conductivity, maintaining a dispersed state of components and preventing component elution during drying.
Implementation Method 1
a complexing agent 1 that is capable of forming Li3PS4 and a complex containing the halogen atom
Implementation Method 2
an instant drying step of drying by contact with a medium
Implementation Method 3
having a diffraction peak at 2θ=25.0±0.5° in X-ray diffractometry using a CuKα ray
Data Source
AI summary
Provided are: a crystalline sulfide solid electrolyte, which has an improved ionic conductivity while adopting a liquid phase method, contains predetermined atoms, has a diffraction peak in X-ray diffractometry using a predetermined CuKα ray, and has a thio-LISICON Region II-type crystal structure as a basic structure; and a method for producing a crystalline sulfide solid electrolyte, the method including mixing using predetermined complexing agents and an instant drying step.