Ceramic Separator Dual Binder System for Lithium Battery Stability
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Solution Overview
Problem
Ceramic separators in lithium batteries face challenges with thermal and mechanical stability, adhesion issues, and limited ion conductivity due to the use of polyolefin films and adhesives, which can lead to overheating, cracking, and reduced battery performance.
Innovation Solution
A ceramic separator using a dual binder system comprising a linear polymer and a cross-linking polymer to enhance adhesion and heat tolerance, allowing for a higher percentage of ceramic particulates and optimized hole distribution for improved ion conductivity and electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polyolefin film is used as separator, then chemical stability is improved, but thermal stability deteriorates
Solution Approach 1:
The patent applies composite materials by combining polyolefin film with ceramic particles to create a separator that maintains the chemical stability of polyolefin while adding the thermal stability of ceramic materials. The ceramic particles are dispersed within the polyolefin matrix, creating a composite structure that leverages the advantages of both materials.
2Temperature
If ceramic particles are coated on substrate film, then thermal stability is improved, but adhesion deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the adhesive composition to include specific ratios of binders and solvents, and by controlling drying conditions. The adhesive contains a blend of binders with different properties, and the solvent system is carefully selected to optimize both adhesion and particle distribution. Drying is controlled to prevent excessive particle rearrangement while ensuring proper adhesion.
3Strength
If adhesive amount is increased to improve adhesion, then adhesion is improved, but ion conductivity deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the adhesive composition to include specific ratios of binders and solvents, and by controlling the amount and distribution of ceramic particles. The adhesive contains a blend of binders with different properties, and the solvent system is carefully selected to maximize ion conductivity while maintaining adequate adhesion. The ceramic particle concentration and size distribution are optimized to create conductive pathways.
4Reliability
If ceramic particle percentage is increased to improve ion conductivity, then ion conductivity is improved, but adhesion deteriorates
Solution Approach 1:
The patent applies composite materials by creating a multi-component adhesive system that includes a blend of binders specifically designed to work with high concentrations of ceramic particles. The binder system includes polymers with different functional groups that provide both adhesion and compatibility with ceramic surfaces. The composite structure allows high ceramic content while maintaining cohesive adhesion through the synergistic binder system.
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 dual binder system maintains ion migration paths and structural integrity at high temperatures, reducing the risk of micro-shorts and enhancing the overall electrical and thermal performance of the battery.
Implementation Method 1
The dual binder system includes a linear polymer and a cross-linking polymer... The adhesion and heat tolerance are enhanced by the characteristic of the two type of polymers
Implementation Method 2
The ceramic separator is suitable for electrical insulation and ion migration permission... The structure and the distribution of the holes, formed by the ceramic particulates and the dual binder system thereon, is optimized to promote a better balance between of the electrical insulation and the ionic conductivity
Implementation Method 3
The cross-linking polymer forms such cross-linking network with dense structure... the adhesion and heat tolerance are enhanced by the characteristic of the two type of polymers... the adhesive can stand at high-temperature without melting
Data Source
AI summary
An electricity supply element and the ceramic separator thereof are provided. The ceramic separator is adapted to separate two electrode layers of the electricity supply element for permitting ion migration and electrical separation. The ceramic separator is made of ceramic particulates and the adhesive. The adhesive employs dual binder system, which includes linear polymer and cross-linking polymer. The adhesion and heat tolerance are enhanced by the characteristic of the two type of polymers. The respective position of the two electrode layers are maintained during high operation temperature to improve the stability, and battery performance. Also, the ceramic separator enhances the ion conductivity and reduces the possibility of the micro-short to increase practical utilization.