Solid-State Battery Slurry Composition for Fluidity and Ion Conductivity
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Solution Overview
Problem
Conventional slurry compositions for all-solid-state secondary batteries face challenges in achieving high fluidity for improved leveling properties during application and enhancing ion conductivity of the solid electrolyte-containing layers.
Innovation Solution
A slurry composition comprising an inorganic solid electrolyte, a binder, and a basic functional group-containing compound with a nitrogen atom and a hydrocarbon group, specifically amines or nitriles, which improves fluidity and ion conductivity when used in the right proportions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional slurry composition (heptane as main solvent, tributylamine as sub-solvent, hydrogenated butadiene rubber as binder, electrode active material, and sulfide solid electrolyte) is used, then the slurry can form an electrode mixed material layer, but the fluidity is insufficient leading to poor leveling property during application
Solution Approach 1:
The patent changes the chemical composition parameters of the slurry by introducing a basic functional group-containing compound (such as amines or nitriles) with specific molecular weight ranges (50-5000) and controlling its content (0.005-5 parts by mass per 100 parts by mass of inorganic solid electrolyte). This parameter change fundamentally alters the fluidity characteristics and leveling properties of the slurry during application.
2Reliability
If conventional slurry composition is used, then the electrode mixed material layer can be formed, but the ion conductivity of the solid electrolyte-containing layer is insufficient
Solution Approach 1:
The basic functional group-containing compound acts as an intermediary substance that facilitates ion transport within the solid electrolyte-containing layer. This compound, with its specific chemical structure (containing basic functional groups like amines or nitriles), mediates between the inorganic solid electrolyte particles and enhances the overall ion conductivity of the layer without requiring complex manufacturing changes.
3Ease of operation
If the amount of basic functional group-containing compound is increased to improve fluidity, then leveling property improves, but ion conductivity may be compromised
Solution Approach 1:
The patent precisely controls the concentration parameter of the basic functional group-containing compound within the narrow range of 0.005-5 parts by mass per 100 parts by mass of inorganic solid electrolyte. This optimized parameter range simultaneously achieves high fluidity for good leveling properties and maintains high ion conductivity in the solid electrolyte-containing layer.
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 achieves high fluidity during application and forms a solid electrolyte-containing layer with enhanced ion conductivity, leading to improved battery performance.
Implementation Method 1
When a basic functional group-containing compound is included in the amount described above, it is possible to increase the fluidity of the slurry composition to improve the leveling property during application
Implementation Method 2
allow a solid electrolyte-containing layer formed using the slurry composition to exhibit good ion conductivity
Data Source
AI summary
Disclosed is a slurry composition for an all-solid-state secondary battery which comprises an inorganic solid electrolyte, a binder, a basic functional group-containing compound, and a solvent, wherein an amount of the basic functional group-containing compound is 0.005 parts by mass or more and 5 parts by mass or less per 100 parts by mass of the inorganic solid electrolyte.