Solid Electrolyte Sheet via Radical Polymerization
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Solution Overview
Problem
Conventional solid electrolyte sheets for solid-state batteries, formed using hydrosilylation reactions with sulfide solid electrolyte materials, suffer from low sheet strength due to catalyst poisoning, which impairs polymerization and affects their workability and moldability.
Innovation Solution
A method involving radical polymerization instead of thermal addition polymerization, using a binder composition with a monomer or oligomer having a double bond and a radical polymerization initiator, to produce a solid electrolyte material-containing sheet that is stronger and more suitable for battery applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermal addition polymerization with hydrosilylation catalyst is used to form solid electrolyte sheet, then bindability is achieved through polymerization, but sheet strength becomes low due to catalyst poisoning by sulfur atoms
Solution Approach 1:
The invention changes the polymerization mechanism from thermal addition polymerization (hydrosilylation reaction requiring Pt catalyst) to radical polymerization. This parameter change in the chemical reaction type eliminates catalyst poisoning by sulfur atoms, allowing complete polymerization and forming a solid electrolyte sheet with high strength and excellent workability.
2Reliability
If powder-form sulfide solid electrolyte material is used, then excellent ion conductivity is achieved, but workability and moldability become poor
Solution Approach 1:
The invention creates a composite material system combining powder-form sulfide solid electrolyte material (providing ion conductivity) with a binder composition containing polymerizable monomer or oligomer. The binder forms a continuous matrix that binds the powder particles, transforming the poor-workability powder into a formable sheet while maintaining the ion conductivity of the sulfide solid electrolyte material.
3Ease of manufacture
If conventional binder composition with hydrosilylation catalyst is used, then sheet can be formed, but edge chipping occurs during shaping
Solution Approach 1:
The invention changes the polymerization system to radical polymerization, which provides more uniform cross-linking and better mechanical properties throughout the sheet. This eliminates edge chipping during shaping while maintaining ease of sheet formation, improving both manufacturability and edge quality.
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 results in a solid electrolyte material-containing sheet with enhanced strength and flexibility, improving the production efficiency and quality of solid-state batteries by avoiding catalyst poisoning and allowing for a broader range of solvent choices, thus enabling continuous production and reducing edge chipping during shaping.
Implementation Method 1
polymerizing the sheet-shaped composition by radical polymerization
Data Source
AI summary
A main object of the present invention is to provide a method for producing a solid electrolyte material-containing sheet excellent in strength. The present invention attains the object by providing a method for producing a solid electrolyte material-containing sheet comprising the steps of: preparing a raw material composition containing a sulfide solid electrolyte material and a binder composition containing a monomer or oligomer having a double bond and a radical polymerization initiator; applying the raw material composition to form a sheet-shaped composition; and polymerizing the sheet-shaped composition by radical polymerization.