Semi-Solid Electrode Forming With Vacuum Degassing and Edge Control
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Solution Overview
Problem
The production of semi-solid electrodes for electrochemical cells faces challenges such as edge control difficulties, inefficiencies in electrolyte retention, and homogeneity issues due to the use of binders, which impede conductivity and increase processing complexity.
Innovation Solution
A method involving the mixing of active and conductive materials with an electrolyte to form a semi-solid electrode material, followed by vacuum de-gassing and compression to form an electrode brick, which is then dispensed onto a current collector using a device with top and side blades for precise shaping and edge control, eliminating the need for binders and improving homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If binders are used to hold electrode materials together, then structural integrity is improved, but ionic and electronic conductivity are impeded and processing complexity increases
Solution Approach 1:
The patent removes binders entirely from the electrode formulation, extracting the harmful component that impeded conductivity. The electrode materials are held together through compression and vacuum de-gassing processes rather than chemical binders, achieving both structural integrity and improved conductivity.
Solution Approach 2:
The patent changes the physical state and processing parameters of the electrode materials. By applying vacuum de-gassing and compression at controlled pressures, the materials achieve cohesive structural integrity without requiring binders, thereby maintaining high conductivity.
2Manufacturing precision
If stencils and masks are used to shape semi-solid electrode edges, then edge definition is improved, but material efficiency decreases due to crumbling and electrolyte loss
Solution Approach 1:
The patent replaces the mechanical stencil/mask system with a vacuum-based containment approach. The vacuum de-gassing process creates negative pressure that holds the semi-solid electrode material in place during shaping, eliminating the need for physical masks and preventing material crumbling and electrolyte loss.
3Manufacturing precision
If mechanical cutting of current collectors is used, then electrode shaping is achieved, but tooling wear requires frequent replacement reducing productivity
Solution Approach 1:
The patent replaces mechanical cutting tools with a vacuum-based material delivery system. The semi-solid electrode material is deposited and shaped through vacuum-controlled dispensing, eliminating wear-prone mechanical cutting tools and enabling continuous production without frequent tooling replacement.
4Adaptability or versatility
If small batch electrode production is used, then flexibility is maintained, but concentration gradients and homogeneity issues arise
Solution Approach 1:
The patent implements a continuous vacuum de-gassing and compression process that maintains consistent processing conditions throughout electrode production. This continuous action ensures uniform material distribution and eliminates concentration gradients, achieving homogeneity while maintaining production flexibility through adjustable vacuum and compression parameters.
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 enables the continuous and semi-continuous production of electrochemical cells with improved edge integrity, reduced electrolyte loss, and enhanced homogeneity, leading to more efficient and cohesive electrode formation.
Implementation Method 1
drawing a vacuum on the semi-solid electrode material
Implementation Method 2
compressing the semi-solid electrode material to form an electrode brick
Data Source
AI summary
Embodiments described herein relate generally to systems and methods for continuously and/or semi-continuously manufacturing electrochemical cells with semi-solid electrodes. In some embodiments, a method can include mixing an active material, a conductive material, and an electrolyte to form a semi-solid electrode material. The method further includes drawing a vacuum on the semi-solid electrode material, compressing the semi-solid electrode material to form an electrode brick, and dispensing a portion of the electrode brick onto a current collector via a dispensation device to form an electrode. In some embodiments, the current collector is disposed on a pouch material. In some embodiments, the dispensation device includes a top blade for top edge control and two side plates for side edge control. In some embodiments, the method can further include conveying the electrode through the top blade and the two side plates to shape the electrode.