Corona-Treated Separator Assembly for Battery Adhesion and Wetting
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Solution Overview
Problem
Conventional electrode assemblies in secondary batteries face issues with low adhesion between the separator and electrodes, leading to separator folding and reduced electrolyte impregnation due to processes like lamination or heat pressing, which can cause performance degradation.
Innovation Solution
An electrode assembly with a separator that includes both adhesive and non-adhesive portions, treated with corona surface treatment on the adhesive areas to enhance adhesion, while maintaining electrolyte impregnation by avoiding treatment on non-adhesive areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If lamination or heat press is performed to improve adhesion between separator and electrode, then adhesion is greatly improved, but electrolyte impregnation and gas release are reduced causing performance degradation
Solution Approach 1:
The separator is designed with different surface properties in different regions: the edge region has corona treatment for strong adhesion to prevent folding, while the central region maintains original surface properties to ensure good electrolyte impregnation and gas release. This local differentiation resolves the contradiction between adhesion strength and electrolyte permeability.
2Reliability
If no adhesive layer is present on separator, then electrolyte impregnation is maintained, but adhesion between electrode and separator is low causing separator folding
Solution Approach 1:
The separator applies corona treatment only to the edge region (within 5mm from the edge) while leaving the central region untreated. This creates local adhesion enhancement at edges to prevent folding during manufacturing, while maintaining electrolyte impregnation capabilities in the central region where no treatment is applied.
Solution Approach 2:
The separator surface is segmented into two functional zones: an edge region with corona treatment for mechanical adhesion and a central region without treatment for electrochemical performance. This segmentation allows each region to optimize its specific function without compromising the other.
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
Improves interfacial adhesion between electrodes and separators, preventing separator folding and ensuring effective electrolyte impregnation without performance degradation.
Implementation Method 1
a separator embedded within a unit cell, including an adhesive portion with a corona surface treatment and a non-adhesive portion without a corona surface treatment
Data Source
AI summary
The present invention relates to an electrode assembly, a secondary battery including the electrode assembly, and a method of manufacturing the electrode assembly, wherein a corona surface treatment is applied to a portion of a surface of a separator located inside a unit cell to increase interfacial adhesion between the separator and an electrode without decreasing electrolyte impregnability.