Non-aqueous Battery Functional Layer Design
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Solution Overview
Problem
Conventional non-aqueous secondary battery separators with protection and adhesive layers have complex manufacturing processes and exhibit insufficient adhesion in electrolysis solution, leading to suboptimal battery performance.
Innovation Solution
A single functional layer is formed on a separator substrate using a composition of organic particles with specific properties and non-conductive inorganic particles, where the difference in density between the two is 1.5 g/cm3 or more, and the volume-average particle diameters have a specific ratio, enabling both protection and adhesion functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate protection layer and adhesive layer are formed on separator substrate, then adhesion to electrode is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent combines the protection layer and adhesive layer into a single integrated functional layer formed by coating a slurry containing inorganic particles and organic particles onto the separator substrate. This merging eliminates the need for separate formation steps of protection layer and adhesive layer, thereby simplifying the manufacturing process while maintaining both protective and adhesive functions in one layer.
Solution Approach 2:
The functional layer is designed to perform multiple functions simultaneously: it provides mechanical protection to the separator substrate while also providing adhesion to the electrode. The slurry composition with specific inorganic particles (for protection and porosity) and organic particles (for adhesion and flexibility) enables this multi-functionality within a single layer structure.
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 simplifies the manufacturing process and enhances adhesion between the electrode and separator in electrolysis solution while maintaining superior battery characteristics, improving productivity and performance.
Implementation Method 1
having a degree of swelling in electrolysis solution of greater than 1 time to 4 times
Data Source
AI summary
The disclosed non-aqueous secondary battery functional layer is formed using a composition that includes non-conductive inorganic particles and organic particles, wherein a difference in density between the non-conductive inorganic particles and the organic particles is 1.5 g/cm3 or more, at least a surface layer portion of the organic particles is made of polymer having a degree of swelling in electrolysis solution of greater than 1 time to 4 times and having a glass-transition temperature of 50° C. or above, and a volume-average particle diameter of the organic particles is 0.80 to 1.50 times a volume-average particle diameter of the non-conductive inorganic particles.