Solid Electrolyte Slurry Composition for Fluidity and Ion Conductivity
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Solution Overview
Problem
Conventional slurry compositions for all-solid-state secondary batteries lack improvement in fluidity, preservation stability, and ion conductivity of the solid electrolyte-containing layer.
Innovation Solution
A slurry composition containing a solid electrolyte, a polymer, and a solvent, with a specific ratio of fineness of grind of the solid electrolyte to its average primary particle diameter, ranging from more than 1 to less than 30, to enhance fluidity and preservation stability, and improve ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional slurry composition is used, then the battery structure can be formed, but fluidity and preservation stability are insufficient
Solution Approach 1:
The patent changes the particle size parameters of the solid electrolyte by controlling the fineness of grind relative to average primary particle diameter within a specific range (1-30), and adjusts the polymer content to 5-50 mass% to optimize both fluidity and preservation stability of the slurry composition
Solution Approach 2:
The patent uses a composite slurry composition containing solid electrolyte particles, polymer binder, and solvent, where the combination of these materials with specific ratios creates a system that achieves both good fluidity for application and preservation stability for storage
2Reliability
If conventional slurry composition is used, then the solid electrolyte-containing layer can be formed, but ion conductivity is insufficient
Solution Approach 1:
The patent optimizes the particle size distribution of solid electrolyte by controlling fineness of grind/average primary particle diameter ratio within 1-30, and adjusts polymer content to 5-50 mass%, which improves ion conductivity while ensuring proper layer formation quality
Solution Approach 2:
The patent controls the particle size segmentation of solid electrolyte, creating a distributed particle size structure that enhances ion conductivity pathways while maintaining manufacturable layer formation
Data Source
AI summary
Provided is a slurry composition for an all-solid-state secondary battery that has excellent fluidity and preservation stability and can form a solid electrolyte-containing layer having excellent ion conductivity. The slurry composition contains a solid electrolyte, a polymer, and a solvent. The ratio of fineness of grind of the solid electrolyte, as measured by a grind gauge method based on JIS K5600-2-5:1999, relative to the average primary particle diameter of the solid electrolyte is more than 1 and less than 30.