Dry Electrode Powder Mixing with Screw Binder Fibrillation
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Solution Overview
Problem
Current methods for producing electrode powder mixtures for battery cells are inefficient, lacking scalability and continuous production capabilities, and often require solvents that are energy-intensive to remove or recover.
Innovation Solution
A method utilizing a machine with a driven screw that extends in the lengthwise direction to thoroughly blend and convey powders, producing a scalable and continuous electrode powder mixture without solvents by blending, fibrillating, and comminuting active material, binder, and conductive additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid or paste coating methods are used to apply active material onto the carrier, then the electrode layer can be formed, but a large amount of energy is required for drying and solvent disposal is necessary
Solution Approach 1:
The invention extracts and eliminates the solvent component from the coating process entirely. By using a dry powder mixture instead of a liquid or paste slurry, the patent removes the need for drying operations and solvent recovery systems, directly addressing the energy consumption and environmental disposal issues associated with liquid coating methods.
Solution Approach 2:
The patent employs a dry powder mixture that can be directly applied and sintered without requiring solvent recovery and reuse infrastructure. This approach treats the coating material as a disposable dry mixture that is consumed in the sintering process, eliminating the need for expensive and energy-intensive solvent recovery systems.
2Object-generated harmful factors
If dry coating method is used to avoid solvent, then the electrode layer can be formed as solid, but the powder mixture lacks suitable properties for creating a contiguous layer
Solution Approach 1:
The invention changes the physical and chemical parameters of the powder mixture by incorporating specific binders and conductive additives in optimized ratios. The binder content (1-10 wt%) and conductive additive content (0.1-5 wt%) are carefully controlled to ensure the dry powder mixture achieves proper flowability, adhesion, and electrical conductivity, enabling contiguous layer formation without solvent.
Solution Approach 2:
The patent creates a composite powder mixture combining active material particles with binder materials and conductive additives. This composite structure provides the dry powder mixture with multiple functionalities: the binder ensures particle bonding and layer contiguity, while the conductive additive maintains electrical conductivity, allowing the layer to form properly without solvent assistance.
3Ease of manufacture
If conventional batch processing methods are used for powder mixture production, then the electrode powder mixture can be produced, but scalability and continuous production are not possible
Solution Approach 1:
The invention transitions from batch processing to continuous processing by implementing a continuous mixing and conveying system. The screw conveyor continuously transports the powder mixture through the mixing zone and into the coating zone, enabling uninterrupted production and significantly increasing productivity while maintaining consistent powder mixture quality throughout the process.
Solution Approach 2:
The patent implements preliminary mixing and homogenization of the powder components in a continuous mixer before the material enters the coating zone. This preliminary action ensures that the active material, binder, and conductive additive are uniformly distributed before application, enabling continuous production while maintaining the required manufacturing precision and layer quality.
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 achieves a scalable and continuous production of electrode powder mixtures, reducing material and energy requirements, and eliminating the need for solvent removal or recovery, resulting in improved efficiency and sustainability.
Implementation Method 1
a machine that has a driven screw which extends in the lengthwise direction and which serves for thoroughly blending and conveying a powder in the lengthwise direction
Implementation Method 2
the screw produces a second powder out of the first powder in that the binder is fibrillated
Implementation Method 3
the screw produces the electrode powder mixture out of the second powder in that the fibrillated binder is comminuted
Data Source
AI summary
A method for the production of an electrode powder mixture for a battery cell includes filling an active material, a binder and a conductive additive into a filling section of a machine that has a driven screw which extends in the lengthwise direction and which serves for thoroughly blending and conveying a powder in the lengthwise direction. The screw blends the binder, the active material and the conductive additive in order to form a first powder, and the screw makes a second powder out of the first powder in that the binder is fibrillated. The screw produces the electrode powder mixture out of the second powder in that the fibrillated binder is comminuted, and the electrode powder mixture is removed from the machine at a removal opening, whereby the removal opening is at a distance from the filling section in the lengthwise direction.