Semi-Solid Electrode Coating for Binder-Free Battery Manufacturing
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Solution Overview
Problem
Conventional battery manufacturing methods are complex and costly, involving binding agents that occupy space, impede conductivity, and increase processing complexity, while also requiring extensive equipment and material manipulation.
Innovation Solution
The development of continuous and semi-continuous methods for manufacturing semi-solid electrodes, which dispense a semi-solid electrode slurry onto a current collector, separate it into discrete portions, and cut the collector to form finished electrodes, eliminating the need for binding agents and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional battery manufacturing methods use binding agents to hold electrode components together, then the electrode structure is cohesive and manageable, but the binding agents occupy space, impede conductivity, and increase processing complexity
Solution Approach 1:
The patent extracts and eliminates the binding agent component from the electrode structure. By using a slurry coating method where particles are suspended in a liquid medium that is subsequently dried, the invention removes the need for separate binding agents, thereby reducing component complexity and processing steps while maintaining electrode cohesion through particle-particle contact and current collector adhesion
2Reliability
If binding agents are used to ensure conductive networks are in place during assembly, then the electrode maintains structural integrity, but the binding agents occupy space and impede ionic and electronic conductivity
Solution Approach 1:
The invention removes binding agents from the electrode composition entirely. Instead, structural integrity is achieved through the mechanical adhesion of the slurry coating to the current collector and the physical interlocking of particles during the drying and calendering processes, eliminating the harmful conductivity impediment caused by binding agents
Solution Approach 2:
The patent changes the physical state and arrangement of electrode components by using a slurry that is coated in a wet state and then dried. This parameter change from liquid suspension to solid structure allows particles to be densely packed and directly contact each other, creating conductive networks without requiring binding agents, thus improving both structural integrity and conductivity
3Manufacturing precision
If conventional methods involve extensive material manipulation and equipment for coating, drying, and calendering, then the electrode can be manufactured with controlled thickness and properties, but the manufacturing process becomes more complex and costly
Solution Approach 1:
The patent combines multiple manufacturing operations into a simplified sequence. The slurry coating, drying, and calendering steps are integrated into a continuous process where the slurry is deposited onto the current collector and then processed through drying and rolling in sequence, reducing equipment complexity while maintaining thickness control through the inherent properties of the slurry and process parameters
Data Source
AI summary
Embodiments described herein relate generally to systems and methods for continuously and/or semi-continuously manufacturing semi-solid electrodes and batteries incorporating semi-solid electrodes. In some embodiments, the process of manufacturing a semi-solid electrode includes continuously dispensing a semi-solid electrode slurry onto a current collector, separating the semi-solid electrode slurry into discrete portions, and cutting the current collector to form a finished electrode.