Low-Viscosity Electrode Composition for High-Speed Discharge
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Solution Overview
Problem
The high viscosity of conventional liquid compositions for producing electrode composite materials in lithium ion secondary batteries results in low productivity and peel strength of the electrodes, making them unsuitable for diverse applications such as portable devices and wearable technology.
Innovation Solution
A liquid composition with a viscosity of 50 mPa·s or less, containing an active material, a dispersion medium, and a polymerizable compound, which is dischargeable from a liquid discharge head, improving discharge stability and peel strength when applied to an electrode substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a binder is dissolved in a dispersion medium to form a liquid composition for producing electrode composite material, then the liquid composition can be applied to an electrode substrate, but the viscosity becomes high which lowers productivity
Solution Approach 1:
The patent changes the chemical composition parameters of the liquid composition by replacing conventional binder-dispersion medium systems with a polymerizable compound-dispersion medium system. This parameter change reduces viscosity from typical high values (hundreds of mPa·s) to 50 mPa·s or less, enabling high-speed discharge while maintaining electrode formation capability
Solution Approach 2:
The patent substitutes the conventional binder mechanism (which relies on dissolution and adhesion) with a polymerizable compound mechanism that forms binding through polymerization reactions. This substitution enables low-viscosity formulation while achieving adequate electrode composite formation after curing
2Stability of the object's composition
If the viscosity of the liquid composition is high, then the liquid composition can maintain stability, but the discharge stability from liquid discharge head deteriorates
Solution Approach 1:
The patent optimizes the viscosity parameter to 50 mPa·s or less, which is the optimal range for both compositional stability and discharge reliability. This parameter change ensures the liquid composition remains stable during storage while achieving consistent droplet discharge without clogging or irregular flow
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 composition enhances the peel strength of the electrode composite material while maintaining discharge stability, enabling improved productivity and performance in electrochemical elements for various applications.
Implementation Method 1
The liquid composition contains a polymerizable compound... The polymerizable compound may be any compound having a polymerizable group such as a vinyl group, an epoxy group, an oxetane group, or a isocyanate group
Data Source
AI summary
A liquid composition for an electrode composite material is provided. The liquid composition comprises an active material, a dispersion medium, and a polymerizable compound. A viscosity of the liquid composition at 25 degrees C. is a viscosity at which the liquid composition is dischargeable from a liquid discharge head.