Lattice Nanofiber Separator for Battery Ion Conductivity
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Solution Overview
Problem
Conventional separators with nanofiber layers face a trade-off between mechanical strength and ion conductivity, as increasing the thickness of the nanofiber layer to enhance mechanical strength reduces ion conductivity.
Innovation Solution
A separator design featuring a lattice-shaped first nanofiber layer with thinner second and third nanofiber layers on either surface, maintaining electrolyte flow and enhancing mechanical strength while preserving ion conductivity, achieved through specific thickness and opening area optimizations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the nanofiber layer is increased to enhance mechanical strength, then the mechanical strength is improved, but the ion conductivity is reduced
Solution Approach 1:
The separator is divided into three distinct nanofiber layers with different thicknesses and functions: a first nanofiber layer (10-30 μm) providing mechanical strength, and second and third nanofiber layers (1-5 μm each) providing insulation and dendrite resistance. This segmentation allows each layer to be optimized for its specific function, resolving the contradiction between mechanical strength and ion conductivity.
Solution Approach 2:
Different regions of the separator have different thicknesses tailored to their functional requirements. The first nanofiber layer in the middle is thickest for mechanical support, while the second and third layers on the surfaces are thinner to minimize resistance to ion flow. This local quality differentiation enables the separator to achieve both high mechanical strength and high ion conductivity simultaneously.
2Reliability
If the thickness of the separator is reduced to enhance ion conductivity, then the ion conductivity is improved, but the mechanical strength is reduced
Solution Approach 1:
The separator is divided into three distinct nanofiber layers with different thicknesses and functions: a first nanofiber layer (10-30 μm) providing mechanical strength, and second and third nanofiber layers (1-5 μm each) providing insulation and dendrite resistance. This segmentation allows each layer to be optimized for its specific function, resolving the contradiction between mechanical strength and ion conductivity.
Solution Approach 2:
Different regions of the separator have different thicknesses tailored to their functional requirements. The first nanofiber layer in the middle is thickest for mechanical support, while the second and third layers on the surfaces are thinner to minimize resistance to ion flow. This local quality differentiation enables the separator to achieve both high mechanical strength and high ion conductivity simultaneously.
Data Source
AI summary
The present invention provides a separator and a method for manufacturing the separator. The separator includes a first nanofiber layer (20) which has a lattice shape when viewed from a plan view, a second nanofiber layer (30) which is provided on a first surface of the first nanofiber layer (20) and is thinner than the first nanofiber layer, and a third nanofiber layer (40) which is provided on a second surface of the first nanofiber layer and is thinner than the first nanofiber layer. The thickness of the first nanofiber layer ranges from 7 μm to 30 μm. The thickness of each of the second and third nanofiber layers ranges from 1 μm to 5 μm. The present invention can provide a separator which has high insulation, high dendrite resistance, high ion conductivity and high mechanical strength.