Solid Electrolyte Inkjet Composition With Tuned Viscosity and Boiling Point
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Solution Overview
Problem
Existing liquid compositions for inkjet printing of solid-electrolyte-containing layers face challenges with high viscosity limitations and dispersion medium boiling point constraints, which affect discharge performance and material costs in producing all-solid-state batteries.
Innovation Solution
A liquid composition comprising a solid electrolyte and a dispersion medium with ring-containing hydrocarbons or phenyl ethers having 9 or more atoms other than hydrogen, optimizing viscosity and boiling point for improved discharge stability and drying performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional slurry-like liquid composition is used for inkjet printing, then the composition can be applied, but the viscosity is too high (10 to 100 times higher than required) for proper inkjet discharge
Solution Approach 1:
The patent changes the chemical composition parameters of the liquid composition by replacing conventional slurry-like compositions with a carbon nanotube dispersion in a specific solvent system. This parameter change reduces viscosity from 10-100 times the required level to within the acceptable range for inkjet printing (below 200 mPa s), while maintaining discharge performance and enabling proper inkjet discharge.
2Productivity
If a dispersion medium with low boiling point is used, then drying is faster, but the dispersion medium cannot withstand the drying temperature and decomposes or evaporates prematurely
Solution Approach 1:
The patent selects a dispersion medium with specific boiling point parameters (above 100°C but below 200°C) that balances drying speed and thermal stability. This parameter optimization allows the composition to be dried at temperatures that are high enough for rapid drying but low enough to prevent decomposition, achieving both fast productivity and material stability.
3Quantity of substance
If high viscosity liquid composition is used, then material coverage is better, but the inkjet head cannot discharge the composition properly
Solution Approach 1:
The patent changes the viscosity parameter of the liquid composition by using a carbon nanotube dispersion in a carefully selected solvent system. This reduces viscosity to below 200 mPa s, enabling easy discharge through the inkjet head while maintaining sufficient material coverage and concentration of active ingredients.
Solution Approach 2:
The patent introduces a specific dispersion medium as an intermediary between the carbon nanotubes and the final applied layer. This intermediary solvent system facilitates both proper discharge through the inkjet head and effective material deposition, bridging the contradiction between dischargeability and coverage.
Data Source
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AI summary
A liquid composition includes a solid electrolyte and a dispersion medium. The dispersion medium is a ring-containing hydrocarbon or phenyl ether, each having 9 or more atoms other than hydrogen atom.