Particle Liquid Composition for Separator Electrode Insulation
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Solution Overview
Problem
The electrode mixture layer in integrated separator electrodes absorbs particles from a particle-containing liquid composition, reducing the thickness of the particle layer and lowering the electrically insulating resistance, while increasing the contact angle to inhibit particle insertion leads to instability due to the coffee ring effect.
Innovation Solution
A liquid composition comprising particles, a resin, and solvents A and B, with specific surface tension and particle size distributions to ensure effective dispersion and prevent particle absorption into the electrode mixture layer, thereby maintaining high electrically insulating resistance and avoiding the coffee ring effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the particle-containing liquid composition is applied onto the electrode mixture layer, then the particle layer is formed, but particles are inserted into the electrode mixture layer reducing the thickness of the particle layer and lowering the electrically insulating resistance
Solution Approach 1:
The patent changes the surface tension parameter of the liquid composition by selecting specific solvent combinations (e.g., cyclic carbonate + chain carbonate, or cyclic carbonate + chain carboxylate) to achieve a surface tension of 25-50 mN/m. This parameter change prevents particle insertion into the electrode mixture layer while maintaining proper wetting, thereby preserving both particle layer thickness and electrically insulating resistance
Solution Approach 2:
The patent uses a composite solvent system consisting of two different solvents (cyclic carbonate and chain carbonate, or cyclic carbonate and chain carboxylate) rather than a single solvent. This composite solvent composition allows simultaneous achievement of appropriate surface tension (25-50 mN/m) and evaporation characteristics, preventing particle insertion while ensuring uniform particle layer formation with high insulating resistance
2Reliability
If the contact angle of the liquid composition is increased to inhibit particle insertion, then the electrically insulating resistance increases, but the coffee ring effect occurs increasing instability of the resistance
Solution Approach 1:
The patent optimizes the surface tension parameter to a specific range (25-50 mN/m) which balances two competing requirements: high enough to prevent particle insertion and maintain insulating resistance, but low enough to avoid the coffee ring effect and ensure uniform distribution. This precise parameter control achieves both high reliability and compositional stability
Solution Approach 2:
The patent considers the porous structure of the electrode mixture layer and designs the liquid composition properties accordingly. By controlling surface tension and using appropriate solvent combinations, the liquid composition can penetrate the porous structure uniformly without causing particle insertion or coffee ring effect, ensuring stable resistance throughout the porous electrode 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
The liquid composition enhances the electrically insulating resistance of the integrated separator electrode while preventing the coffee ring effect, ensuring stable and efficient electrochemical device performance.
Implementation Method 1
a surface tension with respect to air at 25° C. is 25 mN/m or more and less than 50 mN/m
Data Source
AI summary
A disclosed liquid composition includes particles; a resin; a solvent A; and a solvent B differing from the solvent A, wherein a surface tension with respect to air at 25° C. is 25 mN/m or more and less than 50 mN/m, a 90% diameter is 2.5 μm or less, and a median diameter is 1 μm or less.