Sulfide Solid Electrolyte Processing for Conductivity-Heat Balance
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Solution Overview
Problem
All-solid-state batteries face issues with heat generation and low thermal stability due to reactions between the solid electrolyte and active materials, requiring a sulfide-based solid electrolyte with balanced ion conductivity and heat generation.
Innovation Solution
A method for producing a sulfide-based solid electrolyte using a sulfide glass-based material with lithium halides, immersed in an organic solvent to achieve desired porosity and crystallinity, forming a glass ceramic with increased ion conductivity and heat dissipation, thereby reducing heat generation in the electrode layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid electrolyte is used to achieve high ion conductivity, then ion conductivity is improved, but heat generation increases and thermal stability decreases
Solution Approach 1:
The patent applies porous materials by controlling the specific surface area of sulfide-based solid electrolyte particles to be 10.0 m²/g or more. The porous structure increases the contact area between electrolyte and electrode, improving ion conductivity while the controlled pore structure helps dissipate heat more effectively, reducing the harmful heat generation effect.
Solution Approach 2:
The patent changes physical parameters by specifying the specific surface area parameter (≥10.0 m²/g measured by BET method) and particle size distribution of the sulfide-based solid electrolyte. By optimizing these parameters, the invention achieves high ion conductivity while controlling heat generation through increased surface area for both ion transport and heat dissipation.
2Reliability
If specific surface area is increased to improve ion conductivity, then ion conductivity is improved, but heat generation amount increases
Solution Approach 1:
The invention utilizes porous materials with specific surface area of 10.0 m²/g or more, which provides extensive surface area for ion conduction while the porous network structure facilitates heat dissipation pathways, thereby reducing heat generation amount despite the increased surface area.
Solution Approach 2:
The patent optimizes the specific surface area parameter to be ≥10.0 m²/g, which is the critical threshold that simultaneously achieves high ion conductivity and adequate heat dissipation. This parameter change balances the competing requirements of ion transport efficiency and heat management.
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 provides a sulfide-based solid electrolyte with balanced ion conductivity and reduced heat generation, enhancing thermal stability and performance of the electrode layer in all-solid-state batteries.
Implementation Method 1
immersing the sulfide glass-based material, which is at least one sulfide glass-based material selected from the group consisting of a sulfide glass and a glass ceramic, in an organic solvent having a solubility parameter of 7.0 or more and 8.8 or less
Implementation Method 2
heating the sulfide glass at a temperature higher than a crystallization temperature (Tc) of the sulfide glass, which is a temperature observed by thermal analysis measurement, thereby obtaining a glass ceramic
Data Source
AI summary
Provided is a method for producing a sulfide-based solid electrolyte with a balance between the ion conductivity of the sulfide-based solid electrolyte and the heat generation amount of an electrode layer containing the sulfide-based solid electrolyte during an electrode reaction. Disclosed is a method for producing a sulfide-based solid electrolyte comprising a sulfide glass-based material that contains at least one lithium halide compound selected from the group consisting of LiI, LiBr and LiCl, the method comprising immersing the sulfide glass-based material, which is at least one sulfide glass-based material selected from the group consisting of a sulfide glass and a glass ceramic, in an organic solvent having a solubility parameter of 7.0 or more and 8.8 or less, for 1 hour to 100 hours.