Battery Separator Dot Coating for Adhesion and Electrolyte Wetting
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Solution Overview
Problem
Conventional separators for power storage devices face a trade-off between adhesive force with electrodes and injectability of the electrolyte solution, making it difficult to achieve both simultaneously.
Innovation Solution
A separator with a thermoplastic polymer-containing layer having a specific dot pattern, where the dot diameter ranges from 20 μm to 1,000 μm, dot distance from 100 μm to 3,000 μm, and a dot distance/dot diameter ratio between 0.5 and 4, along with a contact angle of 0° to 20° with the electrolyte solution, is used to enhance both adhesion and injectability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive layer is coated on the separator substrate to improve adhesion with electrodes, then the adhesive force is improved, but the injectability of the electrolyte solution deteriorates
Solution Approach 1:
The adhesive layer is segmented into a dot pattern rather than being continuous. This segmentation creates discrete adhesive regions that maintain bond strength while leaving gaps for electrolyte injection, resolving the contradiction between adhesion and injectability
Solution Approach 2:
The separator has non-uniform structure with adhesive dots distributed at specific intervals. The local adhesive regions provide bonding strength where needed, while the inter-dot regions maintain porosity for electrolyte flow, achieving both adhesion and injectability through spatially differentiated properties
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
The solution allows for improved adhesion with electrodes while ensuring efficient injectability of the electrolyte solution, thereby enhancing the productivity of power storage devices.
Implementation Method 1
a contact angle between the thermoplastic polymer-containing layer and an electrolyte solution is 0° to 20°
Data Source
AI summary
Provided is a separator for a power storage device, said separator comprising a substrate and a thermoplastic polymer-containing layer that is formed on at least one substrate surface of the substrate and contains a thermoplastic polymer, wherein the thermoplastic polymer-containing layer has a dot pattern, the dot diameter (a) of 20 μm to 1,000 μm, the inter-dot distance (b) is 100 μm to 3,000 μm, the dot diameter (a) and the inter-dot distance (b) satisfy the relationship expressed by the expression: [inter-dot distance]/[dot diameter]=0.5 to 4, and the contact angle between the thermoplastic polymer-containing layer and an electrolyte is 0° to 20°.