Solid Electrolyte Slurry Coating to Prevent Battery Layer Air Bubbles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Air bubbles formed during the formation of the solid electrolyte layer in the manufacturing process of an all-solid-state battery can lead to recessed positions, degrading the properties and reliability of the battery.
Innovation Solution
The method involves applying a solid electrolyte slurry to a foundation layer using a die head, ensuring that the pressure and viscosity of the slurry inside the die head satisfy the relationship P/4η<4 and the foundation layer porosity is between 30% to 50%, thereby inhibiting air bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid electrolyte slurry is applied to foundation layer using die head, then solid electrolyte layer is formed, but air bubbles may form in the solid electrolyte layer causing recessed areas
Solution Approach 1:
The patent applies parameter changes by establishing a specific mathematical relationship between pressure (P) and viscosity (η) of the solid electrolyte slurry: P/4η<4. This parameter control ensures the slurry flows appropriately through the die head without trapping air bubbles, while still forming a complete solid electrolyte layer. The controlled pressure-viscosity relationship prevents both air bubble formation and material deficiency, resolving the contradiction between manufacturing precision and battery reliability.
2Manufacturing precision
If pressure is increased to prevent material deficiency, then solid electrolyte layer completeness is improved, but air bubble formation may increase
Solution Approach 1:
The patent resolves this contradiction by introducing a coupled parameter relationship rather than controlling pressure alone. The condition P/4η<4 creates an optimal balance where pressure is sufficient to ensure complete material deposition but not excessive to cause air bubble entrapment. The viscosity term in the relationship acts as a moderating factor, allowing pressure adjustment based on material properties.
Solution Approach 2:
The patent applies preliminary action by controlling the slurry's viscosity characteristics before application. By pre-adjusting the viscosity parameter and maintaining the P/4η<4 relationship, the system prepares the slurry in an optimal state for deposition, preventing air bubble formation before it occurs during the application process.
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
This approach prevents air bubble formation, thereby improving the properties and reliability of the all-solid-state battery.
Implementation Method 1
a pressure P of the solid electrolyte slurry and a viscosity η of the solid electrolyte slurry inside the die head at a predetermined shear rate satisfy a relationship of P/4η<4
Data Source
AI summary
A method of producing an all-solid-state battery comprises preparing a second slurry which is a solid electrolyte slurry, and applying the second slurry to a foundation layer using a die head to form a solid electrolyte layer. A pressure P of the second slurry and a viscosity η of the second slurry inside the die head at a predetermined shear rate satisfy a relationship of P/4η<4. The foundation layer has a porosity within a range of 30% to 50%.