Separator Adhesion Dots With Central Gaps for Cleaner Electrode Stacking
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Solution Overview
Problem
The presence of solvent and dispersion medium on the surface of separators in electrode bodies can lead to reduced capacity and performance in storage devices, as they can be transferred to electrodes during the stacking process.
Innovation Solution
A method for manufacturing storage devices that involves applying an adhesion layer slurry with a solvent and dispersion medium on the separator, followed by removing these components to form an adhesion layer in a dot shape with a central non-formed region, which reduces the amount of solvent and dispersion medium remaining during the stacking process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesion layer slurry including adhesive and solvent is applied to the separator surface, then adhesion between separator and electrodes is improved, but solvent remains on the separator surface and transfers to electrodes during stacking, reducing battery capacity and performance
Solution Approach 1:
The adhesion layer is segmented into dot-shaped regions rather than continuous coverage. Multiple dot-shaped adhesion layers are arranged on the separator surface, each with a non-formed region in the central portion. This segmentation reduces the total amount of solvent while maintaining adhesion at critical contact points between separator and electrodes.
Solution Approach 2:
The adhesion layer is applied with non-uniform distribution - dot-shaped regions with adhesive material are positioned at specific locations where adhesion is needed, while central portions remain free of adhesive. This local quality approach concentrates adhesion functionality where required while minimizing solvent content in non-critical areas.
2Strength
If a continuous adhesion layer is formed on the separator surface, then adhesion between separator and electrodes is maximized, but the amount of solvent and dispersion medium remaining in the electrode body increases
Solution Approach 1:
The adhesion layer is divided into discrete dot-shaped segments rather than forming a continuous layer. Each dot-shaped adhesion layer covers only the necessary area for adhesion, leaving gaps (non-formed regions) between them. This segmentation significantly reduces the total volume of solvent and dispersion medium while maintaining sufficient adhesion strength.
3Reliability
If adhesion layer slurry is applied to ensure proper bonding, then manufacturing reliability is improved, but the complexity of the manufacturing process increases due to additional forming and drying steps
Solution Approach 1:
The adhesion layer slurry is applied in advance in a dot-shaped pattern with non-formed central portions before the stacking process. This preliminary action allows the adhesive to be positioned precisely where needed, and the solvent to evaporate or be removed before electrodes are stacked, simplifying the overall manufacturing process while ensuring reliable bonding.
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
This approach effectively minimizes the solvent and dispersion medium in the electrode body, thereby enhancing the performance and reducing the likelihood of performance reduction in storage devices like lithium-ion batteries.
Implementation Method 1
a forming step of removing at least one of the solvent and the dispersion medium from the adhesion layer slurry on the separator to form an adhesion layer
Data Source
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Figure 5~6
AI summary
A method for manufacturing a storage device (100) disclosed herein includes an arranging step (S1) of arranging an adhesion layer slurry on a surface of a separator (26), a forming step (S2) of removing a solvent and a dispersion medium from the adhesion layer slurry to form an adhesion layer (6), and a stacking step (S3) of stacking a positive electrode (22), the separator (26), and a negative electrode (24). In the stacking step (S3), the separator (26) including the adhesion layer (6) arranged in a shape of a plurality of dots on a surface thereof is used, and each of the dots of the adhesion layer (6) includes an adhesion layer non-formed region (E) in a central portion thereof when viewed from top.