Dry Electrode Powder Blending With One-Pot Shear Mixing
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Solution Overview
Problem
Existing methods for manufacturing dry battery electrodes involve multi-step processes that are cumbersome and energy-consuming, often resulting in non-homogeneous powder products.
Innovation Solution
A single-step 'dry one-pot' method where powders of electrode active material, conductive material, binder, and co-binder are mixed together in a solvent-free process using a rotative tumbler blender with high shear blades, achieving a sandy pasty product that can be further converted into a powdery blend through controlled temperature and mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-step preparation processes are used for manufacturing dry battery electrodes, then the process can achieve electrode formation, but the process becomes cumbersome and energy consuming
Solution Approach 1:
The patent combines multiple separate mixing steps into a single integrated dry mixing process. All components (active material, conductive material, binder, and co-binder) are mixed together in one pot simultaneously, eliminating the need for separate mixing steps and intermediate handling, thus simplifying the process while maintaining electrode formation quality
Solution Approach 2:
The single-pot mixing system performs multiple functions simultaneously: mixing active materials, conductive materials, binders, and co-bindors in one operation. This multi-functional approach replaces multiple specialized mixing steps, reducing process complexity and energy consumption
2Reliability
If multi-step preparation processes are used for manufacturing dry battery electrodes, then the process can achieve electrode formation, but the produced powder is not homogeneous enough
Solution Approach 1:
By combining all mixing operations into a single continuous process, the patent ensures consistent mixing conditions throughout. All components are exposed to the same mixing environment and duration, preventing the heterogeneity that arises from multiple discrete mixing steps with potential variations in conditions between steps
3Ease of manufacture
If traditional multi-step mixing methods are used, then the process can be implemented, but it requires solvent and multiple processing steps increasing energy consumption
Solution Approach 1:
The patent removes solvents from the mixing process entirely, implementing a purely dry mixing approach. This eliminates the energy-intensive steps of solvent addition, dissolution, and subsequent drying, while still achieving homogeneous mixing of all electrode components
Solution Approach 2:
The single-pot mixing process operates continuously without interruption for intermediate drying or solvent removal steps. All components are mixed in one continuous operation, maximizing process efficiency and minimizing energy consumption compared to batch processes with multiple start-stop cycles
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 method simplifies the process, reduces energy consumption, enhances powder homogeneity, and minimizes pollution, while producing high-quality electrode materials blends efficiently.
Implementation Method 1
A step 2) of dry mixing together all the powders provided at step 1), to form a primary mixture of all these powders; A step 3) of dry blending said primary mixture resulting from step 2), for a sufficient time for the resulting mixture to be converted in the expected electrode materials blend as a sandy pasty product
Data Source
Figure 1
AI summary
The invention relates to a dry one-pot method for producing an electrode materials blend comprising the fibrillization of a mixture of at least one electrode active material, optionally a powder of at least one conductive material, a powder of at least one binder, and optionally a powder of at least one co-binder.