Ceramic Membrane Adhesion to Plasma-Treated Polymer Fleece
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Solution Overview
Problem
Current ceramic separators in batteries face issues with detachment under mechanical stress and limited thermal stability, leading to high failure rates and safety concerns due to internal short circuits and flammability of electrolytes.
Innovation Solution
A ceramic membrane with improved adhesion to a polymer fleece is produced using plasma treatment and a combination of alkyltrialkoxysilanes as adhesion promoters, creating a pinhole-free and abrasion-resistant coating that enhances mechanical stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a ceramic coating is applied to a polymer fleece separator, then thermal stability is improved, but the ceramic coating detaches under mechanical stress
Solution Approach 1:
The polymer fleece is subjected to plasma treatment before the ceramic coating is applied. This preliminary action modifies the surface properties of the polymer, creating enhanced adhesion sites that prevent ceramic detachment during subsequent mechanical stress in battery operation.
Solution Approach 2:
An adhesion promoter layer is introduced as an intermediary between the plasma-treated polymer fleece and the ceramic coating. This intermediate layer acts as a chemical bridge, forming strong bonds with both the polymer substrate and the ceramic particles, thereby preventing coating detachment while maintaining thermal stability.
2Stability of the object's composition
If the ceramic coating is made more stable to water, then chemical resistance is improved, but cracks and abrasion occur during further processing
Solution Approach 1:
A composite coating structure is created combining ceramic particles with an organic adhesion promoter matrix. This composite material integrates the water stability of ceramic with the flexibility and crack resistance of the organic binder, allowing the coating to withstand mechanical processing without cracking or abrading.
Solution Approach 2:
The crosslinking density and composition of the adhesion promoter matrix are optimized to balance chemical stability and mechanical flexibility. By adjusting these parameters, the coating achieves sufficient water resistance while maintaining the ductility needed to prevent crack formation during battery assembly and operation.
3Strength
If a plasma treatment is applied to improve adhesion, then bonding strength is improved, but the production process becomes more complex
Solution Approach 1:
The mechanical plasma treatment process is replaced or supplemented with chemical adhesion promoters that can be applied through simpler coating methods. This substitution reduces the need for complex plasma generation equipment while achieving comparable or superior adhesion through chemical bonding mechanisms.
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 membrane exhibits improved adhesion, mechanical stability, and resistance to water and solvents, reducing the risk of internal short circuits and enhancing battery safety and performance by preventing pinholes and micro-shorts.
Implementation Method 1
the polymer fleece is subjected to a plasma treatment
Implementation Method 2
the reactive group on the alkyl radical of one adhesion promoter reacting with the reactive group of the other adhesion promoter or the polymer surface subjected to a plasma treatment during the at least one-time heating to form a covalent bond
Data Source
AI summary
The present invention relates to flexible ceramic membranes which, depending on their design, are suitable as separators for batteries, in particular lithium batteries, and to a method for their production in which the polymer fleece is subjected to plasma treatment.