Separator Surface Composition for Solvent-Free Lamination Adhesion
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Solution Overview
Problem
The existing separators for electrochemical devices face challenges in maintaining adhesive force during lamination and stacking processes without using organic solvents, which increases manufacturing costs and requires separate solvent treatment facilities.
Innovation Solution
A separator with a coating layer containing specific ratios of halogen and metal atoms, primarily fluorine and aluminum, on a porous polymer substrate, enhancing both dry and wet adhesive forces while eliminating the need for organic solvents in the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a binder resin is added to the slurry for the coating layer to secure adhesive force, then adhesive force between electrode and separator is improved, but manufacturing complexity increases due to additional materials and processing steps
Solution Approach 1:
The invention changes the surface composition parameters of the coating layer by controlling the content of halogen atoms (10% by weight or less) and metal atoms (20% by weight or more) exposed on the surface. This parameter adjustment enables the coating layer to achieve proper adhesive force for lamination and stacking processes without requiring additional binder resins, thus resolving the contradiction between adhesive force and manufacturing complexity
Solution Approach 2:
The coating layer is formed as a composite material containing inorganic particles and polymer binder particles with specific surface composition. The composite structure with controlled surface exposure of halogen and metal atoms provides both the necessary adhesive force and eliminates the need for separate binder resin addition, reducing manufacturing complexity
2Ease of manufacture
If oil-based slurry coating using organic solvent such as acetone is used to form coating layer, then coating layer formation is achieved, but manufacturing cost increases and environmental restrictions apply due to organic solvent treatment facilities
Solution Approach 1:
The invention extracts and eliminates the organic solvent component from the slurry coating process. By formulating a solvent-free or water-based slurry that can still form a proper coating layer with the required surface composition (halogen atoms ≤10% by weight, metal atoms ≥20% by weight), the process removes the need for organic solvent treatment facilities, reducing manufacturing complexity and cost while maintaining coating layer formation capability
Solution Approach 2:
The invention changes the slurry composition parameters by removing organic solvents and adjusting the formulation to use alternative vehicles (such as water or no solvent). This parameter change allows the slurry to maintain proper viscosity and coating properties without requiring organic solvent treatment facilities, resolving the contradiction between ease of manufacture and manufacturing facility complexity
Data Source
Figure 1A~1B
Figure 2
Figure 3~4
AI summary
The present disclosure relates to a separator for an electrochemical device and an electrochemical device comprising the same, and specifically, to a separator for an electrochemical device, which adjusts the contents of halogen atoms and metal atoms exposed on the surface of a coating layer, thereby enabling a dry adhesive force and a wet adhesive force to be improved and the heat resistance of the separator to be improved, and an electrochemical device comprising the same.