Multi-Layer Battery Separator for Lower Cell Resistance
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Solution Overview
Problem
Existing lithium-ion battery separators lack efficient lithium-ionic conductivity, leading to high cell resistance and inefficient ion transfer, which affects the overall performance and longevity of the battery.
Innovation Solution
A porous separator film with a multi-functional composite structure, comprising an inner layer with ceramic filler and an outer layer with ferroelectric material, is used to enhance lithium-ionic conductivity between the separator and the electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional porous separator film is used, then the battery structure is simple and manufacturing is easy, but lithium-ionic conductivity is insufficient leading to high cell resistance
Solution Approach 1:
The patent applies composite materials by combining porous separator film with ceramic filler particles and ferroelectric material layers to create a multi-component separator structure. This composite approach enhances lithium-ionic conductivity through the synergistic effects of the porous structure (providing ion transport pathways), ceramic filler (enhancing thermal stability and ionic conductivity), and ferroelectric material (improving interfacial ionic conductivity), thereby resolving the contradiction between maintaining structural simplicity and improving conductivity performance.
Solution Approach 2:
The patent implements local quality by creating distinct layers with different functionalities: the porous separator film provides bulk ion transport, the ceramic filler layer provides thermal stability and enhanced ionic conductivity at specific locations, and the ferroelectric material layer provides improved interfacial conductivity at the electrode contact regions. This localized functional differentiation allows each layer to optimize its specific role, improving overall conductivity without requiring complete restructuring of the entire separator.
2Productivity
If the separator uses advanced composite materials to improve lithium-ionic conductivity, then ion transfer efficiency increases, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the separator into multiple distinct layers: a porous separator film layer, a ceramic filler-containing layer, and a ferroelectric material layer. Each layer can be manufactured separately using established techniques and then assembled through lamination or co-forming processes. This segmented approach allows for optimized manufacturing of each component independently while achieving superior overall ion transfer efficiency through the combined structure.
3Reliability
If a multi-layer separator structure is implemented, then cell resistance is reduced, but the number of components and layers increases
Solution Approach 1:
The patent applies merging by integrating multiple functional components into a unified separator assembly where the porous film, ceramic filler layer, and ferroelectric layer work together as a single functional unit. The layers are bonded together through sintering, adhesion promoters, or co-forming techniques, creating a structurally integrated component that reduces cell resistance through the synergistic combination of all layers while being treated as one assembly during battery manufacturing.
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 proposed separator design significantly improves lithium-ionic conductivity, reducing cell resistance and enhancing ion transfer efficiency, thereby improving the performance and longevity of lithium-ion batteries.
Implementation Method 1
an outer layer disposed against the inner layer and including ferroelectric material configured to facilitate lithium-ionic conductivity between the separator and an electrode
Implementation Method 2
a porous separator film
Data Source
AI summary
A separator of a lithium-ion battery cell includes a porous separator film, an inner layer disposed against the separator film and including ceramic filler, and an outer layer disposed against the inner layer and including ferroelectric material configured to facilitate lithium-ionic conductivity between the separator and an electrode.