Wax-Coated Ceramic Nanoparticles for Polymer Membrane Dispersion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ceramic particles are difficult to load and disperse into polymeric resin due to surface energy differences, especially when particle size decreases to the nanometer range, leading to non-uniform mixing and agglomeration issues in membrane production, such as battery separators.
Innovation Solution
Surface-treated ceramic particles with a reactive end and non-polar end are coated with a low molecular weight wax to alter their surface energy, allowing better blending with polymeric materials, and the use of these wax-coated particles in polymeric membranes addresses dispersion problems and enhances mixing uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ceramic particles are loaded into polymeric resin to improve safety and performance, then heat resistance and rigidity are enhanced, but surface energy differences cause difficult loading and dispersion
Solution Approach 1:
The patent changes the surface energy parameter of ceramic particles by applying surface treatments (silane coupling agents, organic coatings) to match the surface energy of the polymeric resin. This parameter modification enables better wetting and dispersion of particles within the polymer matrix, resolving the manufacturing difficulty while maintaining the enhanced heat resistance and rigidity properties
Solution Approach 2:
The patent introduces intermediary substances (surface treatment agents, coupling agents) that mediate between the ceramic particles and polymeric resin. These intermediaries create compatible interfaces by reducing surface energy differences, facilitating uniform particle distribution and loading without compromising the structural and thermal properties provided by the ceramic particles
2Reliability
If particle size is reduced to nanometer range to improve performance, then safety and barrier properties are enhanced, but surface energy increases causing greater dispersion problems
Solution Approach 1:
The patent applies surface treatments specifically tailored for nanoparticles to modify their surface energy parameters. The surface modifications counteract the increased surface energy inherent to nanoscale particles, enabling them to disperse uniformly in the polymeric resin while maintaining the enhanced safety and barrier properties that result from the reduced particle size
Solution Approach 2:
The patent creates composite materials where nanoparticles are integrated into the polymeric matrix through surface treatment. The treated nanoparticle-polymer composites achieve both the improved safety and barrier properties from nanoparticle incorporation and the manufacturing feasibility from reduced surface energy differences, allowing uniform dispersion throughout the material
3Manufacturing precision
If surface treated particles are used to improve dispersion, then mixing uniformity is enhanced, but particles tend to clump and form agglomerates
Solution Approach 1:
The patent applies surface treatments to particles before mixing with the polymeric resin. This preliminary surface modification creates a protective interface that prevents particle-particle attraction and agglomeration during the mixing process, ensuring uniform distribution throughout the material while maintaining compositional stability of the particle network
4Reliability
If ceramic particles are added to enhance safety, then dendrite blocking and shorting prevention are improved, but non-uniform mixing reduces effectiveness
Solution Approach 1:
The patent modifies the surface energy parameters of ceramic particles through surface treatments to match the polymeric resin. This parameter alignment ensures uniform mixing and distribution of particles throughout the separator, creating consistent dendrite blocking pathways and shorting prevention capabilities across the entire battery separator structure
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 enables uniform dispersion of ceramic nanoparticles in polymeric membranes, improving the properties of battery separators by enhancing surface energy matching, reducing agglomeration, and increasing the absorption rate of lithium ion electrolytes, while promoting longer battery cycle life by scavenging hydrofluoric acid.
Implementation Method 1
The surface coating preferably alters the surface energy of the particle to be similar to the surface energy of the polymeric material. With similar surface energies, the nanoparticle can be better mixed or blended with a polymeric material.
Implementation Method 2
The surface treated ceramic particles are additionally preferably uniformly coated with a low molecular weight wax before mixing with the polymeric material. Blending of the wax-coated surface treated ceramic nanoparticles with the polymeric material successfully addresses problems with non-uniform mixing and dispersion of ceramic particles and polymeric materials.
Data Source
AI summary
A membrane includes a porous membrane or layer made of a polymeric material having a plurality of surface treated (or coated) particles (or ceramic particles) having an average particle size of less than about 1 micron dispersed therein. The polymeric material may be selected from the group consisting of polyolefins, polyamides, polyesters, co-polymers thereof, and combinations thereof. The particles may be selected from the group consisting of boehmite (AlOOH), SiO2, TiO2, Al2O3, BaSO4, CaCO3, BN, and combinations thereof, or the particles may be boehmite. The surface treatment (or coating) may be a molecule having a reactive end and a non-polar end. The particles may be pre-mixed in a low molecular weight wax before mixing with the polymeric material. The membrane may be used as a battery separator.