Fluorescent Inorganic Separator Coating for Heat-Stable Adhesion
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Solution Overview
Problem
Conventional separators for electrochemical devices, such as batteries, face challenges in heat resistance, adhesive strength, and chemical stability, particularly due to the use of excessive organic binders which can lead to ignition, explosion, and degradation of battery performance.
Innovation Solution
A separator with an inorganic particle layer on a porous substrate, where the inorganic particles exhibit specific fluorescence properties, forming strong bonds between particles and the substrate without using excessive organic binders, enhancing heat resistance and adhesive strength while maintaining chemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If organic binders are used to form inorganic particle layers on porous substrates, then adhesive strength between particles and substrate is improved, but heat resistance deteriorates due to ignition and explosion risks
Solution Approach 1:
The patent removes organic binders from the inorganic particle layer formulation, extracting the harmful component that causes ignition risks while maintaining particle adhesion through alternative mechanisms such as sintering or direct bonding of inorganic particles to the porous substrate
Solution Approach 2:
The patent changes the chemical composition parameters by replacing organic binder materials with inorganic alternatives, fundamentally altering the thermal properties of the coating to achieve high-temperature stability while maintaining adhesive strength through controlled particle interaction
2Strength
If organic binders are used to maintain structural integrity of inorganic particle layers, then adhesive strength is improved, but chemical stability deteriorates due to dissolution in electrolyte solutions
Solution Approach 1:
The patent extracts organic binder components from the inorganic particle layer system, eliminating the source of chemical instability and dissolution in electrolyte solutions while preserving structural integrity through inorganic particle networking
Solution Approach 2:
The patent creates a composite inorganic particle layer structure where multiple inorganic materials work together to provide both mechanical strength and chemical stability, replacing the organic-inorganic composite with a purely inorganic composite system that resists electrolyte degradation
3Strength
If excessive organic binders are used in inorganic particle layers, then adhesive strength is improved, but heat resistance and safety deteriorate due to ignition and explosion risks
Solution Approach 1:
The patent completely removes organic binder substances from the inorganic particle layer composition, extracting the flammable component that generates ignition and explosion hazards while maintaining coating integrity through inorganic particle bonding mechanisms
Solution Approach 2:
The patent converts the potential harm of organic binders by replacing them with inorganic materials that provide equivalent or superior adhesive properties without the associated fire risks, turning a safety liability into a safety advantage
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 provides improved heat resistance, adhesive strength, and chemical stability, preventing ignition and rupture, and maintaining excellent electrical properties, thus enhancing battery safety and performance.
Implementation Method 1
the first inorganic particles have a fluorescence retention rate represented by the following Equation 1 of 85% or more: Fluorescence retention rate (%)=I100/I0×100 wherein I0 is a maximum fluorescence intensity in the range of 600 nm to 750 nm which is detected when a solution obtained by diluting an upper 10 vol % of aliquot of an aqueous slurry including 5 wt % of the first inorganic particles by a dilution factor of 500 is irradiated with an incident light having a wavelength in a range of 300 nm to 350 nm
Data Source
AI summary
Provided are a separator and an electrochemical device using the same, in particular, a separator having significantly low heat shrinkage even at a high temperature and also significantly improved adhesive strength by including inorganic particles having specific fluorescence properties in the separator, and an electrochemical device using the same.