Secondary Battery Binder Composition for Stable Slurry Adhesion
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Solution Overview
Problem
Conventional binder compositions for secondary batteries fail to ensure adequate preservation stability while maintaining excellent adhesiveness of functional layers.
Innovation Solution
A binder composition comprising a polymer with specific chemical composition, including a (meth)acrylic acid ester monomer unit with an aromatic hydrocarbon ring and a structural unit indicated by formula (I), within defined proportions, is used to enhance preservation stability and adhesiveness of slurry compositions and functional layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional binder composition is used, then the functional layer can display adhesiveness, but the preservation stability of the slurry composition is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the proportions of different monomer units in the polymer binder. Specifically, it sets the (meth)acrylic acid ester monomer unit with aromatic hydrocarbon ring at 5-45 mass% and the structural unit of formula (I) at 50-90 mass%. This quantitative parameter optimization resolves the contradiction between preservation stability and adhesiveness by finding the optimal compositional range that balances both properties.
Solution Approach 2:
The patent uses a composite polymer structure combining two types of monomer units with different functions. The (meth)acrylic acid ester monomer unit with aromatic hydrocarbon ring provides preservation stability, while the structural unit of formula (I) contributes to adhesiveness. By combining these complementary components in specific proportions, the patent creates a composite binder material that simultaneously achieves both preservation stability and adhesiveness.
2Reliability
If the proportion of aromatic hydrocarbon ring-containing monomer is increased to improve preservation stability, then preservation stability improves, but adhesiveness may deteriorate
Solution Approach 1:
The patent resolves this contradiction by establishing an optimal parameter range rather than maximizing one component. It sets the aromatic hydrocarbon ring-containing monomer at 5-45 mass% (not higher), ensuring preservation stability while maintaining adhesiveness through the complementary structural unit of formula (I) at 50-90 mass%. This balanced parameter setting prevents the deterioration of adhesiveness.
3Strength
If the proportion of structural unit (I) is increased to improve adhesiveness, then adhesiveness improves, but preservation stability may deteriorate
Solution Approach 1:
The patent resolves this contradiction by setting the structural unit (I) at 50-90 mass% while simultaneously maintaining the aromatic hydrocarbon ring-containing monomer at 5-45 mass%. This dual-parameter control ensures that adhesiveness is improved through sufficient structural unit (I) while preservation stability is maintained through the presence of aromatic hydrocarbon ring-containing monomer.
Data Source
AI summary
Provided is a binder composition that can produce a slurry composition having excellent preservation stability and that can cause a functional layer to display excellent adhesiveness. The binder composition contains a polymer and a solvent. The polymer includes a (meth)acrylic acid ester monomer unit including an aromatic hydrocarbon ring in a proportion of not less than 5 mass % and not more than 45 mass % and includes a structural unit indicated by formula (I), shown below, in a proportion of not less than 50 mass % and not more than 90 mass %. In formula (I), R1 represents a hydrocarbon group having a carbon number of 4 or more that does not include an aromatic hydrocarbon ring and R2 represents a hydrogen atom, a methyl group, or —CH2—C(═O)—O—R1. In a case in which more than one R1 is present in formula (I), each R1 may be the same or different.