Separator Adhesion Dot Pattern to Limit Residual Solvent
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Solution Overview
Problem
The presence of solvent and dispersion medium on the surface of separators in storage devices can lead to reduced capacity and performance due to their transfer to electrodes during the manufacturing process of storage devices like batteries.
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, thereby enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesion layer slurry including solvent and dispersion medium is applied to separator surface, then adhesion between separator and electrodes is improved, but solvent and dispersion medium remain in electrode body causing reduced capacity and performance
Solution Approach 1:
The adhesion layer is segmented into dot-shaped regions rather than continuous coverage. Each dot has a non-formed region in the central portion, creating discrete adhesion zones that reduce solvent retention while maintaining necessary bonding between separator and electrodes.
Solution Approach 2:
The adhesion layer is applied with non-uniform distribution - concentrated at dot regions with central non-formed areas. This local quality variation ensures adhesion where needed (at dot perimeters) while avoiding solvent accumulation in central regions, thus preventing performance degradation.
2Strength
If continuous adhesion layer is formed on separator surface, then adhesion between separator and electrodes is maximized, but solvent and dispersion medium are trapped causing performance reduction
Solution Approach 1:
The continuous adhesion layer is divided into discrete dot-shaped regions with non-formed central portions. This segmentation creates air gaps or voids in the center of each dot that prevent solvent and dispersion medium from being trapped, thereby reducing the quantity of harmful substances remaining in the electrode body.
Solution Approach 2:
The dot-shaped adhesion layer structure inherently creates a porous or hollow configuration with non-formed central regions. This porous structure allows for better solvent evacuation while maintaining adhesion functionality at the dot perimeters, reducing the amount of solvent and dispersion medium retained.
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 method effectively reduces the amount of solvent and dispersion medium in the electrode body, leading to improved storage device performance by minimizing their impact on capacity and input/output efficiency.
Implementation Method 1
an adhesion layer slurry including an adhesive and at least one of a solvent that can dissolve the adhesive and a dispersion medium that can disperse the adhesive
Data Source
AI summary
A method for manufacturing a storage device disclosed herein includes an arranging step of arranging an adhesion layer slurry on a surface of a separator, a forming step of removing a solvent and a dispersion medium from the adhesion layer slurry to form an adhesion layer, and a stacking step of stacking a positive electrode, the separator, and a negative electrode. In the stacking step, the separator including the adhesion layer arranged in a shape of a plurality of dots on a surface thereof is used, and each of the dots of the adhesion layer includes an adhesion layer non-formed region in a central portion thereof when viewed from top.