Laminated Solid Electrolyte Sheet Support for Lower Internal Resistance
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Solution Overview
Problem
Conventional supports for solid electrolyte sheets in all-solid-state batteries have uneven fiber dispersion, leading to insufficient formation of carrier ion pass lines and high internal resistance due to non-uniform electrolyte filling, resulting in high internal resistance.
Innovation Solution
A laminated multilayer support structure is used, integrating paper and non-woven fabric to uniformly disperse fibers, allowing for uniform electrolyte filling and reduced internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer support is used, then the structure is simple, but the fiber dispersion is uneven leading to high internal resistance
Solution Approach 1:
The support is divided into multiple layers (first layer and second layer) with different fiber orientations. Each layer has fibers extending in different directions, which when combined provide uniform dispersion in both longitudinal and transverse directions, reducing internal resistance while maintaining structural simplicity
Solution Approach 2:
The support uses a composite structure combining two different fibrous materials (paper and non-woven fabric) with different fiber orientations. This composite approach achieves uniform fiber dispersion and excellent electrolyte wettability without increasing overall structural complexity
2Strength
If fibers are made to adhere closely for structural integrity, then strength is improved, but electrolyte permeation is blocked leading to insufficient ion pass lines
Solution Approach 1:
Instead of increasing adhesion within a single layer, the invention adds a dimensional aspect by stacking multiple layers with perpendicular fiber orientations. This creates a three-dimensional network of ion pass lines that maintains structural integrity while ensuring electrolyte permeation through the layered structure
Solution Approach 2:
The support maintains high porosity (50-90%) by using a laminated fibrous structure where the interstices between fibers in different layers create continuous porous pathways. This allows electrolyte to penetrate deeply and form extensive ion pass lines while the outer layers provide structural strength
3Quantity of substance
If the support thickness is reduced to improve energy density, then the battery size is reduced, but the self-standing capability is lost
Solution Approach 1:
The laminated composite of paper and non-woven fabric with perpendicular fiber orientations creates a synergistic structure where each layer reinforces the other. This composite architecture provides exceptional mechanical strength and self-standing capability even at thicknesses of 10 μm or less, enabling high energy density without sacrificing structural integrity
4Reliability
If etching treatment is performed to create through-holes, then the ion conductivity is improved, but the manufacturing complexity increases
Solution Approach 1:
The uniform fiber dispersion and porous structure are built into the support during the papermaking and lamination processes, before the solid electrolyte is applied. This preliminary structuring eliminates the need for subsequent etching treatments, maintaining manufacturing simplicity while ensuring excellent ion conductivity through the naturally formed porous network
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 laminated structure enhances electrolyte filling and reduces internal resistance, improving the performance of all-solid-state batteries by increasing the number of carrier ion pass lines and preventing cracks.
Implementation Method 1
a laminated multilayer support structure is used, integrating paper and non-woven fabric to uniformly disperse fibers, allowing for uniform electrolyte filling
Data Source
AI summary
The present invention provides a secondary battery support that employs a configuration where a plurality of layers formed including at least one type selected from paper and a non-woven fabric are laminated and integrated, and can reduce an internal resistance of a solid electrolyte layer.