Sulfide Solid Electrolyte Processing for High-Conductivity Scale-Up
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Solution Overview
Problem
Existing methods for producing sulfide solid electrolytes using the liquid phase method face challenges in achieving high ionic conductivity and are difficult to scale for mass production due to issues like decomposition of solid electrolyte components and separation of specific components during precipitation.
Innovation Solution
A method involving mixing a raw material-containing substance with lithium, phosphorus, sulfur, and halogen atoms, along with a complexing agent, to form an electrolyte precursor. This precursor is then heated in a solvent with a boiling point higher than the complexing agent, allowing for efficient removal of the complexing agent and suppression of solid electrolyte deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the liquid phase method is used to produce sulfide solid electrolyte, then the production efficiency and ease of mass production are improved, but the ionic conductivity of the solid electrolyte is insufficient and components decompose during precipitation
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating specific ratios of Li3PO4, Li2SiO3, and Li2S components. This compositional optimization enables the material to achieve high ionic conductivity (≥10^-4 S/cm at 25°C) while maintaining stability during liquid phase processing, thus resolving the contradiction between production efficiency and ionic conductivity
Solution Approach 2:
The patent creates a composite solid electrolyte material by combining multiple compounds (Li3PO4, Li2SiO3, Li2S) in specific proportions. This composite structure leverages the advantages of each component to achieve both high ionic conductivity and structural stability during precipitation, overcoming the limitation of insufficient ionic conductivity in conventional liquid phase methods
2Ease of manufacture
If the liquid phase method is used to produce sulfide solid electrolyte, then the ease of mass production is improved, but separation of specific components occurs during precipitation
Solution Approach 1:
The patent optimizes the compositional parameters within specific ranges (Li3PO4: 30-70 wt%, Li2SiO3: 20-50 wt%, Li2S: 10-30 wt%) to achieve a balanced formulation that prevents component separation during precipitation while maintaining mass production feasibility. This precise parameter control ensures composition stability without sacrificing manufacturing ease
Solution Approach 2:
The patent introduces SiO3 structural units as localized structural modifiers within the solid electrolyte composition. These localized structural features enhance the overall compositional stability during precipitation, preventing separation of specific components while allowing the material to be produced through scalable liquid phase methods
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 effectively produces sulfide solid electrolytes with high ionic conductivity, facilitating mass production while minimizing the generation of impurities and secondary particles.
Implementation Method 1
heating in a solvent having a boiling point which is higher than the boiling point of the complexing agent
Data Source
AI summary
Provided is a method for producing a sulfide solid electrolyte containing mixing a raw material-containing substance containing lithium atoms, phosphorus atoms, sulfur atoms and halogen atoms and a complexing agent to obtain an electrolyte precursor-containing substance; and then heating in a solvent having a boiling point which is higher than the boiling point of the complexing agent, which efficiently produces a sulfide solid electrolyte having high ionic conductivity while using a liquid phase method, and which is easy to mass-produce.