Binder Composition for Non-Aqueous Secondary Battery Pressability
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Solution Overview
Problem
Conventional binder compositions for non-aqueous secondary batteries fail to achieve sufficient pressability and viscosity stability in slurry compositions, leading to suboptimal performance in functional layers and battery components.
Innovation Solution
A binder composition containing a particulate polymer formed by a polymer with a block region composed of aromatic vinyl monomers and a surface acid content between 0.05 mmol/g and 0.9 mmol/g, which enhances viscosity stability and pressability when used in non-aqueous secondary battery functional layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional binder composition is used, then manufacturing process is simple, but pressability of functional layer is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface acid content of the particulate polymer within 0.05-0.9 mmol/g and the aromatic vinyl monomer unit content within 10-50 mass%. These parameter optimizations enable the binder composition to achieve sufficient pressability during battery manufacturing while maintaining composition simplicity
Solution Approach 2:
The patent uses composite materials by combining a particulate polymer with specific block regions (containing aromatic vinyl monomer units) with conventional binder components. This composite structure provides both the necessary pressability and adhesive properties, resolving the contradiction between manufacturing simplicity and functional performance
2Stability of the object's composition
If conventional binder composition is used, then composition is simple, but viscosity stability of slurry composition is insufficient
Solution Approach 1:
The patent achieves viscosity stability through parameter changes by controlling the surface acid content (0.05-0.9 mmol/g) and aromatic vinyl monomer content (10-50 mass%) of the particulate polymer. These optimized parameters ensure stable slurry viscosity during the coating process without requiring complex additive systems
Solution Approach 2:
The patent applies local quality by creating a particulate polymer with specific local characteristics - block regions containing aromatic vinyl monomer units distributed within the polymer structure. This localized structural feature provides both viscosity stability and pressability while keeping the overall composition relatively simple
3Manufacturing precision
If functional layer is pressed for densification, then electrode mixed material layer density increases, but binder composition must have excellent pressability which conventional compositions lack
Solution Approach 1:
The patent enables excellent pressability for achieving high electrode mixed material layer density by optimizing the binder composition parameters - specifically the surface acid content (0.05-0.9 mmol/g) and aromatic vinyl monomer content (10-50 mass%). These parameter changes allow the functional layer to deform appropriately during pressing while maintaining structural integrity
Data Source
AI summary
Provided is a binder composition for a non-aqueous secondary battery with which it is possible to form a slurry composition for a non-aqueous secondary battery functional layer having excellent viscosity stability and a functional layer for a non-aqueous secondary battery having excellent pressability. The binder composition for a non-aqueous secondary battery contains water and a particulate polymer formed by a polymer including a block region composed of an aromatic vinyl monomer unit. The particulate polymer has a surface acid content of not less than 0.05 mmol/g and not more than 0.9 mmol/g.