Solid-State Battery Cathode Coating to Reduce Composite Pores
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Solution Overview
Problem
Existing methods for manufacturing all-solid-state batteries fail to address pores in the positive electrode composite, leading to reduced electrolyte density, increased resistance, and decreased performance, while also compromising mass-production efficiency.
Innovation Solution
A method involving the use of a lubricating material, such as molybdenum sulfide or tungsten sulfide, to coat the positive electrode active material powder before mixing with electrolyte powder, followed by pressing, which reduces pores and enhances electrolyte mobility, thereby improving battery performance and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If positive electrode active material powder and electrolyte powder are pressed to form a positive electrode composite, then the battery structure is formed, but pores are generated between the particles reducing electrolyte density and performance
Solution Approach 1:
The lubricating material is coated on the positive electrode active material powder before mixing with electrolyte powder. This preliminary coating action prevents direct contact between particles during pressing, reducing pore formation and improving composite density while maintaining battery performance.
Solution Approach 2:
A lubricating material acts as an intermediary substance between the positive electrode active material powder and electrolyte powder. This intermediary layer prevents direct particle-to-particle contact during pressing, reducing pore formation and improving the density and performance of the positive electrode composite.
2Manufacturing precision
If a slurry injection process is used to fill pores in the positive electrode, then pore filling is achieved, but the manufacturing process complexity increases and mass-production efficiency decreases
Solution Approach 1:
The lubricating material is applied in advance to the positive electrode active material powder before mixing and pressing. This preliminary action prevents pore formation during the pressing step itself, eliminating the need for subsequent slurry injection and drying processes, thereby simplifying the manufacturing process and improving mass-production efficiency.
Solution Approach 2:
The invention extracts and eliminates the need for the slurry injection and drying processes by preventing pore formation in the first place through the lubricating material coating. This removes unnecessary manufacturing steps, simplifying the overall process and improving productivity.
3Manufacturing precision
If the positive electrode composite is pressed with high pressure to reduce pores, then density increases, but the manufacturing process complexity and energy consumption increase
Solution Approach 1:
The lubricating material is coated on the positive electrode active material powder before pressing. This preliminary action reduces friction and prevents particle aggregation during pressing, allowing for effective pore reduction at lower pressing pressures, thereby reducing energy consumption while maintaining composite density.
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 effectively reduces pores in the positive electrode composite, lowering internal resistance and enhancing the performance and mass productivity of all-solid-state batteries.
Implementation Method 1
positive electrode active material powder coated with a lubricating material
Data Source
AI summary
Disclosed is a method of manufacturing an all-solid-state battery, the method including a mixture formation step of mixing positive electrode active material powder coated with a lubricating material and electrolyte powder with each other to form a mixture, an application step of applying the mixture to a positive electrode current collector, and a pressing step of pressing the mixture and the positive electrode current collector. Pores in a positive electrode composite layer formed in the pressing step may be reduced, whereby the performance of the all-solid-state battery may be improved.