Core-Shell Polymer Functional Layer for Battery Blocking and Adhesion
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Solution Overview
Problem
Non-aqueous secondary battery components with functional layers face issues of blocking resistance and process adhesiveness during production and storage, leading to faults and reduced productivity due to misalignment and sticking during winding and transportation.
Innovation Solution
A core-shell structure particulate polymer is used in the functional layer, with a specific shell portion containing 1-20% cyano group-containing monomer units, such as acrylonitrile, and a (meth)acrylic acid ester monomer unit, and a volume-average particle diameter of 0.05-1.5 μm, along with a binder content of 1-30 parts per 100 parts of polymer, to achieve balanced blocking resistance and process adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a functional layer is formed on battery components to improve heat resistance and strength, then the battery component performance is improved, but blocking occurs during storage and transportation in wound-up state
Solution Approach 1:
The functional layer is designed with non-uniform properties: high strength and heat resistance in regions where needed, while maintaining low adhesion to adjacent components. The layer's composition and structure are optimized locally to provide mechanical support without causing blocking during wound-up storage and transportation.
Solution Approach 2:
The functional layer acts as an intermediary between the battery component substrate and adjacent components. It provides the necessary mechanical strength and heat resistance to the substrate while simultaneously serving as a release layer that prevents blocking, effectively mediating between structural requirements and anti-blocking requirements.
2Ease of manufacture
If battery components are stacked under strong pressing conditions during production, then assembly is improved, but misalignment occurs during cutting and transportation
Solution Approach 1:
The functional layer is applied to battery components before stacking and assembly operations. This preliminary coating provides a protective interface that allows components to be stacked under strong pressing conditions without direct contact between substrates, preventing misalignment during subsequent cutting and transportation while still enabling effective assembly.
Data Source
AI summary
Provided is a composition for a non-aqueous secondary battery functional layer with which it is possible to form a functional layer that can cause a battery component including the functional layer to display a balance of both high blocking resistance and high process adhesiveness. The composition for a non-aqueous secondary battery functional layer contains a particulate polymer having a core-shell structure including a core portion and a shell portion at least partially covering an outer surface of the core portion. The core portion is formed by a polymer A and the shell portion is formed by a polymer B including not less than 1 mass % and not more than 20 mass % of a cyano group-containing monomer unit.