Solid-State Battery Slurry Mixing for Fluidity and Ion Conductivity
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Solution Overview
Problem
Conventional slurry compositions for all-solid-state secondary batteries face challenges in enhancing fluidity, preservation stability, and ion conductivity of the solid electrolyte-containing layers.
Innovation Solution
A slurry composition comprising a solid electrolyte, a polymer, and a solvent, with a specific fineness of grind ratio relative to the average primary particle diameter of the solid electrolyte, and incorporating vinyl cyanide and (meth)acrylic acid ester monomer units, which improves fluidity and ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional slurry composition is used, then basic battery structure is formed, but fluidity and preservation stability are insufficient
Solution Approach 1:
The patent applies parameter changes by carefully controlling the fineness of grind of the solid electrolyte and the average primary particle diameter within specific ranges. This optimization of physical parameters enables the slurry to achieve both excellent fluidity for easy application and preservation stability for reliable storage, resolving the technical contradiction between ease of operation and reliability.
2Reliability
If conventional slurry composition is used, then electrode layer is formed, but ion conductivity is insufficient
Solution Approach 1:
The patent achieves high ion conductivity by optimizing physical parameters including the fineness of grind of solid electrolyte (0.1-10 μm) and average primary particle diameter (1-100 nm), rather than complicating the slurry composition. This parameter optimization approach improves reliability while maintaining ease of manufacture.
3Reliability
If solid electrolyte particle size is reduced, then ion conductivity improves, but fluidity and preservation stability deteriorate
Solution Approach 1:
The patent resolves this contradiction by precisely controlling two parameters: the fineness of grind (0.1-10 μm) and average primary particle diameter (1-100 nm) within specific ranges. This dual parameter optimization ensures that the solid electrolyte maintains high ion conductivity while the slurry retains excellent fluidity and preservation stability.
4Reliability
If solid electrolyte particle size is reduced, then ion conductivity improves, but preservation stability deteriorates
Solution Approach 1:
The patent simultaneously optimizes the fineness of grind (0.1-10 μm) and average primary particle diameter (1-100 nm) to achieve a balance where high ion conductivity is maintained while preservation stability is improved. The specific parameter ranges prevent excessive particle reduction that would harm stability.
Data Source
AI summary
A method of producing a slurry composition for an all-solid-state secondary battery is provided. The method includes: a step of performing mixing treatment with respect to a composition that contains a solid electrolyte, a polymer, and a solvent and that has a solid content concentration of 70 mass % or more to produce a preliminary mixture; a step of further adding a solvent to the preliminary mixture having a solid content concentration of 70 mass % or more to obtain a diluted material having a solid content concentration of more than 40 mass % and less than 70 mass %; a step of performing kneading treatment with respect to the diluted material having a solid content concentration of more than 40 mass % and less than 70 mass % to produce a kneaded material; and a step of further adding a solvent to the kneaded material to dilute the kneaded material.