Battery Separator Heat-Resistant Layer Composite
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Solution Overview
Problem
Conventional separators for rechargeable batteries lack sufficient heat resistance and adherence to electrodes, leading to potential short circuits and instability during high-temperature conditions.
Innovation Solution
A separator comprising a porous substrate with a heat-resistant layer containing a specific compound represented by Chemical Formula 1 or its cross-linked product, combined with fillers and binders, enhances heat resistance and adherence to electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional separator is used, then the battery can operate, but the separator lacks sufficient heat resistance and may shrink or deform at high temperatures causing short circuits
Solution Approach 1:
The separator is constructed as a composite material consisting of a polyolefin base layer combined with a heat-resistant layer containing polyphenolic compounds (such as urushiol) and inorganic fillers. This composite structure provides both the functional properties of the base separator and the thermal stability of the heat-resistant layer, preventing shrinkage and deformation at elevated temperatures while maintaining operational reliability.
2Temperature
If a heat-resistant layer is added to improve thermal stability, then heat resistance improves, but the device complexity increases
Solution Approach 1:
The heat-resistant layer is designed with a porous structure that allows it to maintain ion conductivity while providing thermal stability. The porous configuration enables electrolyte penetration and ion transport pathways, ensuring that the additional layer does not impede battery function. This approach adds heat resistance without significantly complicating the separator structure, as the porous architecture is consistent with standard separator designs.
3Temperature
If the separator structure is modified to enhance heat resistance, then thermal stability improves, but ion conductivity may be affected
Solution Approach 1:
The heat-resistant layer is formulated with specific local properties including polyphenolic compounds for thermal stability, inorganic fillers for structural integrity, and binding agents for adhesion. This localized composition provides heat resistance precisely where needed while maintaining porosity and connectivity for ion transport. The selective placement and composition of functional components ensure thermal stability without compromising ion conductivity.
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 and adherence, preventing shrinkage and deformation at high temperatures, thus enhancing the stability and performance of rechargeable batteries.
Implementation Method 1
The heat-resistant layer includes a cross-linked product of the compound represented by Chemical Formula 1. The cross-linked product of the compound represented by Chemical Formula 1 may have a weight average molecular weight of about 1,000 g/mol to about 50,000 g/mol.
Implementation Method 2
a heat-resistant layer on at least one surface of the porous substrate. The heat-resistant layer includes a compound represented by Chemical Formula 1 or a cross-linked product thereof
Implementation Method 3
The heat-resistant layer may further include at least one of a cross-linkable compound differing from the compound represented by Chemical Formula 1 and a non-cross-linkable compound.
Data Source
AI summary
A separator for a rechargeable battery includes a porous substrate and a heat-resistant layer disposed on at least one surface of the porous substrate, wherein the heat-resistant layer includes a compound represented by Chemical Formula 1 or a cross-linked product thereof and a rechargeable lithium battery includes the same.(R)n1—Ar—OH [Chemical Formula 1]In Chemical Formula 1, Ar, R, and n1 are the same as described in the detailed description.