Solid Electrolyte Ink Composition for Low-H2S High-Solids Dispersion
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Solution Overview
Problem
Existing liquid compositions for forming solid electrolyte layers in all-solid-state batteries face challenges in suppressing hydrogen sulfide emission and maintaining high dispersibility of inorganic solid electrolytes at high concentrations, especially when using wet processes like inkjet methods.
Innovation Solution
A liquid composition comprising a solvent with a relative permittivity of 6.0 or lower, an inorganic solid electrolyte at a concentration of 20% or higher, and a dispersant soluble in the solvent, which prevents flocculation and allows continuous inkjet discharge for 60 seconds or longer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the solid concentration of inorganic solid electrolyte is increased to improve production efficiency, then productivity increases, but hydrogen sulfide emission increases and dispersibility deteriorates
Solution Approach 1:
The patent changes the key parameter of solvent relative permittivity to a specific range (6.0 ≤ ε < 10.0) to simultaneously achieve high solid concentration (20% or higher), suppress hydrogen sulfide emission, and maintain good dispersibility. This parameter optimization resolves the contradiction between productivity improvement and harmful emission suppression.
Solution Approach 2:
The patent uses a composite liquid composition system combining specifically selected solvent(s) with dispersant(s) to achieve synergistic effects. The composite formulation enables high solid concentration while maintaining dispersibility and suppressing hydrogen sulfide emission, resolving the contradiction between productivity and safety.
2Productivity
If the solid concentration of inorganic solid electrolyte is increased to improve production efficiency, then productivity increases, but dispersibility deteriorates due to flocculation
Solution Approach 1:
The patent optimizes the solvent's relative permittivity parameter to a specific range (6.0 ≤ ε < 10.0) which prevents flocculation and maintains excellent dispersibility even at high solid concentrations of 20% or higher, thereby resolving the contradiction between productivity and compositional stability.
Solution Approach 2:
The patent introduces dispersants as intermediary substances that mediate between the inorganic solid electrolyte particles and the solvent. These dispersants adsorb onto particle surfaces and provide electrostatic or steric repulsion, preventing flocculation and maintaining stability at high concentrations.
3Productivity
If a high solid concentration liquid composition is used to improve production efficiency, then productivity increases, but inkjet dischargeability deteriorates
Solution Approach 1:
The patent carefully balances multiple parameters including solvent relative permittivity (6.0 ≤ ε < 10.0), solid concentration (20% or higher), and viscosity control to achieve a liquid composition that maintains both high productivity and good inkjet dischargeability. The optimized formulation ensures the liquid can be continuously discharged for 60 seconds or longer.
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 solution effectively suppresses hydrogen sulfide emission and enhances the dispersibility of inorganic solid electrolytes, enabling stable and efficient inkjet discharge of high-concentration electrolyte layers, improving production efficiency and safety.
Implementation Method 1
The liquid composition contains a solvent, an inorganic solid electrolyte, and a dispersant... improve the dispersibility of an inorganic solid electrolyte... suppresses hydrogen sulfide emission
Implementation Method 2
The dispersant is soluble in the solvent... relative permittivity of the solvent at 25° C. is 6.0 or lower
Data Source
AI summary
A liquid composition has a solvent, an inorganic solid electrolyte and a dispersant. A solid concentration of the inorganic solid electrolyte in the liquid composition is 20% by mass or higher. The dispersant is soluble in the solvent. A relative permittivity of the solvent at 25° C. is 6.0 or lower.