Inorganic Oxide Inkjet Composition With High Solids and Low Viscosity
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Solution Overview
Problem
Current liquid compositions for inkjet printing of electrode mixture layers in lithium ion secondary batteries face challenges with high viscosity, leading to low productivity and poor dispersibility of inorganic oxides, which affects the performance and efficiency of the batteries.
Innovation Solution
A liquid composition containing an inorganic oxide and an organic solvent with a specific topological index, such as those represented by Chemical Formula 1, is used to achieve excellent dispersibility and balance between high solid content and low viscosity, enabling effective inkjet printing and improving battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a liquid composition with high solid content is used to achieve high productivity, then the viscosity increases to 10³-10⁴ mPa·s, but inkjet printing cannot be performed due to excessive viscosity
Solution Approach 1:
The patent changes the chemical composition parameters of the liquid medium by specifying particular solvents (N-methyl-2-pyrrolidone, dimethyl carbonate, ethyl methyl carbonate) and their proportions to achieve a viscosity range of 1-200 mPa·s while maintaining 60-80 wt% solid content, enabling inkjet printing compatibility
Solution Approach 2:
The patent uses a composite liquid medium composed of multiple components including specific solvents and binders in defined ratios, creating a formulation that simultaneously achieves low viscosity for inkjet printing and high solid content for productivity
2Ease of operation
If a liquid composition with low viscosity is used to enable inkjet printing, then the viscosity is reduced to under 200 mPa·s, but the solid content decreases to 1:10-1:100 of typical slurry levels
Solution Approach 1:
The patent modifies the compositional parameters by selecting specific solvent types and concentrations that maintain low viscosity (under 200 mPa·s) while preserving high solid content (60-80 wt%), overcoming the inverse relationship between viscosity and solid content
Solution Approach 2:
The patent introduces specific binder materials and solvent additives as intermediaries that facilitate the dispersion of high solid content particles in a low-viscosity medium, enabling inkjet printing of concentrated slurries
3Ease of manufacture
If conventional liquid compositions are used, then the manufacturing process is simple, but the dispersibility of inorganic oxides is poor affecting battery performance
Solution Approach 1:
The patent optimizes compositional parameters including solvent ratios, binder content, and additive concentrations to enhance the dispersibility of inorganic oxide particles while maintaining a straightforward manufacturing process
Solution Approach 2:
The patent employs dispersants and surface-modified binders as intermediary substances that improve the wettability and dispersion of inorganic oxide particles in the liquid composition without complicating the manufacturing process
Data Source
AI summary
A liquid composition contains an inorganic oxide and an organic solvent represented by the following Chemical Formula 1,where R1 and R2 each, independently represent straight chain alkyl groups or straight chain alkoxy groups,wherein the organic solvent has a topological index chai4v of 0.9 or greater.