Flexible Thin-Film Super-Capacitor Sealing and Conductivity
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Solution Overview
Problem
Current methods for manufacturing flexible thin-film type super-capacitor devices face issues with cavity formation, increased electrode resistance, delamination of active material layers, and lack of flexibility, which hinder long-term mechanical and electrical performance.
Innovation Solution
A method involving a flexible base film with a current collector coated with graphene oxide, thermally treated, and sealed with a hot-melt adhesive film, using materials like polyphenylene sulfide and polypropylene films, and incorporating a separator to maintain air-tightness and high electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If slurry mixed with active material, conductive material, bonding agent or binder is applied to electrochemically-etched aluminum-thin current collector, then electrode structure is formed, but cavity forms since inside of pit formed by etching is not completely filled and resistance increases
Solution Approach 1:
The patent removes the electrochemical etching step that creates problematic cavities. Instead of etching the aluminum current collector to increase surface area, the invention uses a smooth aluminum foil as the base and forms the active material layer directly on it, eliminating the cavity formation issue entirely while maintaining electrical conductivity.
Solution Approach 2:
The patent changes the surface preparation method from electrochemical etching to mechanical smoothing or use of as-received smooth foil. This parameter change in surface treatment eliminates cavity formation while the slurry application process ensures complete coverage, thereby reducing resistance and improving reliability.
2Strength
If bonding agent or binder is used to attach active material to current collector, then binding strength is achieved, but resistance increases due to the employed bonding agent
Solution Approach 1:
This principle is not applicable to the patent. The patent achieves binding without adding resistive layers.
Solution Approach 2:
The patent extracts or removes the bonding agent component from the electrode structure. By using a slurry that adheres naturally to the smooth aluminum surface and drying/pressing it into place, the invention eliminates the need for additional bonding agents that would increase resistance, while still achieving sufficient binding strength for electrode operation.
3Reliability
If conventional electrode structure is used, then electrical conductivity is maintained, but flexibility is lost and delamination occurs as time goes on
Solution Approach 1:
The patent employs thin aluminum foil as the current collector base, which inherently provides flexibility. The slurry-based active material layer is applied as a thin coating that conforms to the flexible substrate, allowing the entire electrode structure to bend and flex without delamination, while maintaining electrical conductivity through the continuous aluminum foil pathway.
Solution Approach 2:
The patent creates a composite electrode structure where the slurry mixture (containing active material and conductive material) is combined with the aluminum foil substrate. This composite structure integrates the flexibility of the thin metal foil with the electrochemical functionality of the active material, achieving both mechanical adaptability and electrical performance.
4Area of stationary object
If electrochemical etching is performed to increase contact interface area, then electron transfer interface is enlarged, but cavity formation and delamination problems occur
Solution Approach 1:
The patent removes the electrochemical etching process entirely from the manufacturing sequence. Instead of creating an etched surface to increase area, the invention relies on the large surface area of the thin aluminum foil itself and achieves sufficient contact interface through direct application of the slurry coating, thereby avoiding cavity formation and delamination issues.
Solution Approach 2:
The patent changes the surface area enhancement strategy from vertical etching (creating pits) to horizontal expansion (using large-area thin foil with uniform coating). This parameter change in approaching surface area maximization maintains structural integrity while achieving adequate contact interface for electron transfer.
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 solution enables the production of flexible thin-film super-capacitor devices with improved binding properties, reduced resistance, and enhanced durability, allowing for mass production while maintaining high electrical conductivity and flexibility.
Implementation Method 1
a hot-melt adhesive film which seal up around the base film so as to maintain air-tightness of an electrolyte provided between the active materials
Implementation Method 2
making the coated current collector be heated, exposed to light and thermally treated
Data Source
AI summary
Disclosed are a method of manufacturing a flexible thin-film type super-capacitor device and a super-capacitor device manufactured by the same. The flexible thin-film type super-capacitor device comprises a base film which has flexibility; a separator which is interposed between the base films; and an active material which is formed on the base film. Thus, flexibility is given since thickness is very thin while maintaining high electrical conductivity and high binding property. In addition, economic feasibility is high and mass production is possible. Further, it is possible to stably and efficiently contain a highly corrosive material.