Insulating Resin Layer Composition for Low-Shrinkage Electrode Lamination
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Solution Overview
Problem
Existing liquid compositions for forming active material layer guides in solid state secondary batteries face challenges such as volume shrinkage during curing, leading to delamination, curling, and potential short circuits due to high-pressure pressing.
Innovation Solution
A liquid composition comprising a polymerizable compound, a non-crosslinked resin, and a solvent mixture that satisfies specific solubility relationships, minimizing volume shrinkage and promoting a porous structure in the cured resin layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a liquid composition is used to form an insulating resin layer, then the resin layer can be applied to peripheral portions of electrode composite layers, but volume shrinkage during curing causes delamination and curling
Solution Approach 1:
The patent introduces a porous filler material into the liquid composition to create a porous resin layer structure. This porous structure reduces volume shrinkage during curing by providing void spaces that accommodate the shrinkage, preventing delamination and curling while maintaining the insulating function.
Solution Approach 2:
The patent modifies the composition parameters of the liquid composition by adding specific fillers with controlled pore structures. This changes the physical parameters of the resin layer, particularly its volume stability during curing and its mechanical properties, to prevent shrinkage-induced defects.
2Productivity
If high-pressure pressing is applied during battery manufacturing, then electrode lamination is improved, but short circuits may occur due to resin layer instability
Solution Approach 1:
The patent incorporates a porous filler structure in advance into the resin layer that acts as a cushioning element during high-pressure pressing. This pre-built porous structure absorbs and distributes the mechanical stress, preventing resin layer failure and short circuits while allowing effective electrode lamination.
3Strength
If the resin layer is made thick to prevent peeling, then adhesion is improved, but curl development during film formation increases
Solution Approach 1:
The patent uses a porous filler to create a lightweight, low-density resin layer structure. This porous structure reduces the overall thickness and mass of the resin layer needed to achieve adequate adhesion, thereby minimizing curl development during film formation while maintaining sufficient bonding strength.
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 proposed liquid composition effectively reduces curl development during film formation, enhances the stability of the resin layer, and prevents peeling from the substrate, thereby improving the reliability and performance of solid state secondary batteries.
Implementation Method 1
a polymerizable compound represented by the following Chemical Formula 1 or Chemical Formula 2
Data Source
AI summary
A liquid composition contains a polymerizable compound represented by Chemical Formula 1 or Chemical Formula 2, a non-linkable resin having a structural unit represented by Chemical Formula 3, and a solvent,wherein the solvent is a solvent mixture comprising a good solvent that dissolves the polymerizable compound and a poor solvent that leaves the polymerizable undissolved, and the solvent satisfies the following Relationship 1,Polymerizable compound soluble point≤Mixing ratio X<Polymerizable compound soluble point+11 Relationship 1where the mixing ratio X represents a content ratio by percentage based on a mass of the good solvent in the solvent mixture, and the polymerizable compound soluble point represents a minimum content ratio by percentage based on the mass of the good solvent in the solvent mixture.