Solid Oxide Electrolyte Membrane Coating for Uniform Particle Dispersion
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Solution Overview
Problem
Conventional methods for producing oxide solid oxide electrolyte membranes face issues such as large particle size, agglomeration, side reactions like lithium fluoride formation, poor uniformity, surface flatness, conductivity, and a tendency towards short or open circuits due to the inability of dispersants to enter the lithium ion battery cell system.
Innovation Solution
A method involving a master glue mixing process with high molecular polymers and solvents, followed by nano-micronization treatment of oxide slurry with dispersants, and the addition of protective agents to prevent side reactions, combined with roll-to-roll coating for producing oxide ceramic solid oxide electrolyte membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to make oxide solid oxide electrolyte membranes, then the membrane can be produced, but the particle size is large and agglomeration occurs
Solution Approach 1:
The oxide powder is segmented into smaller particles through ball milling treatment, reducing particle size from conventional large sizes to sub-micron scale (0.1-1 μm). This segmentation prevents agglomeration and improves uniformity in the electrolyte membrane.
Solution Approach 2:
A dispersant is introduced as an intermediary substance during the slurry preparation process. The dispersant adsorbs onto particle surfaces, providing steric or electrostatic repulsion that prevents agglomeration and maintains stable dispersion throughout the membrane fabrication process.
2Manufacturing precision
If conventional dispersants are added in the preparation process, then the membrane can be formed, but the dispersant cannot enter the lithium ion battery cell system
Solution Approach 1:
The dispersant molecules are modified by changing their chemical parameters - specifically using dispersants with molecular weights and chemical compositions (such as PVDF, PMMA, or PEO) that are compatible with lithium ion battery systems. This allows the dispersant to remain in the final product without causing side reactions.
3Productivity
If conventional methods are used, then the membrane can be produced, but side reactions such as lithium fluoride formation occur
Solution Approach 1:
The membrane fabrication process is conducted in an inert atmosphere (argon or nitrogen environment) to prevent unwanted chemical reactions. This inert environment protects the oxide powder and dispersant from reacting with moisture or oxygen during processing.
Solution Approach 2:
The potential harmful interaction between dispersant and oxide powder is converted into a beneficial effect by carefully selecting dispersant materials that are chemically compatible. The dispersant that could have caused side reactions instead provides stable dispersion and improves membrane quality when properly selected.
4Ease of manufacture
If conventional methods are used, then the membrane can be formed, but the surface flatness and conductivity are poor
Solution Approach 1:
The oxide powder undergoes preliminary ball milling treatment before being incorporated into the slurry. This pre-treatment ensures fine particle size distribution and prevents agglomeration during subsequent processing, leading to better surface flatness and conductivity in the final membrane.
Solution Approach 2:
The dispersant maintains continuous effective action throughout the entire membrane fabrication process, from slurry preparation through drying. This continuous dispersion prevents particle aggregation at any stage, ensuring uniform surface flatness and consistent conductivity throughout the membrane.
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 method results in oxide solid oxide electrolyte membranes with improved conductivity, surface flatness, and mechanical properties, reducing the likelihood of short or open circuits and enhancing the overall performance and longevity of solid lithium batteries.
Implementation Method 1
providing an oxide powder, a dispersant and a second solvent; mixing the oxide powder, the dispersant and the second solvent to form a second mixed slurry
Implementation Method 2
a high molecular polymer dispersant is added in the grinding process
Implementation Method 3
a high molecular polymer dispersant is added in the grinding process; improving the conductivity of the oxide solid oxide electrolyte membrane
Implementation Method 4
performing ultrasonic oscillations to form a third mixed slurry
Implementation Method 5
performing ultrasonic oscillations to form a third mixed slurry
Implementation Method 6
the addition of protective agents to prevent side reactions
Implementation Method 7
combined with roll-to-roll coating for producing oxide ceramic solid oxide electrolyte membranes
Implementation Method 8
mixing the oxide powder, the dispersant and the second solvent to form a second mixed slurry; producing an oxide solid oxide electrolyte membrane
Data Source
AI summary
A method of making solid oxidesolid oxide electrolyte membrane comprises steps (S1)-(S5). Step (S1), mixing a high molecular polymer and a first solvent to form a first mixed slurry; and homogenizing the first mixed slurry, to obtain a reagent A. Step (S2), mixing an oxide powder, a dispersant and a second solvent to form a second mixed slurry, treating the second mixed slurry, to obtain a reagent B. Step (S3), adding a protective agent into the reagent B to form a third mixed slurry, and homogenizing the third mixed slurry to obtain a reagent C. Step (S4), mixing the reagent A and the reagent C to form a fourth mixed slurry, and treating the fourth mixed slurry a fifth mixed slurry; and homogenizating the fifth mixed slurry to form a solid electrolyte slurry. And step (S5), producing the solid oxidesolid oxide electrolyte membrane by a coating process.