Graphene Supercapacitor Nanolinear Electrodes for Energy Density
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Solution Overview
Problem
Existing supercapacitors face limitations in achieving high energy and power densities due to their construction design, which relies on solid carbon plates with insulators, resulting in poor energy density and high production costs, making them unsuitable for replacing lithium-ion batteries.
Innovation Solution
The development of graphene-based supercapacitors with nanolinear patterns and shapes that increase surface area by using thin substrates and high viscosity inks, allowing for precise printing of features smaller than 5 microns, and the use of photoresist processes to create electrodes with minimal spacing and high precision, enabling increased energy density and power density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If solid carbon plates with insulators are used in supercapacitor construction, then structural strength is maintained, but energy density and power density remain poor
Solution Approach 1:
The patent replaces solid carbon plates with thin carbon films deposited on flexible substrates. This allows the electrode structure to maintain structural integrity while dramatically increasing surface area through the thin-film configuration, thereby improving energy density without sacrificing strength.
Solution Approach 2:
The invention transitions from two-dimensional plate structures to three-dimensional folded or stacked film configurations. By folding or stacking thin carbon films, the surface area available for charge storage increases exponentially within the same volume, significantly enhancing energy and power density while maintaining structural strength through the substrate support.
2Quantity of substance
If carbon plates are made thinner to increase surface area, then energy density improves, but structural strength deteriorates
Solution Approach 1:
The patent employs a nested structure where thin carbon films are deposited onto substrate materials that provide mechanical support. The carbon film is nested within the substrate structure, allowing the thin film to provide high surface area for energy storage while the substrate maintains structural strength, resolving the contradiction between thinness and strength.
Solution Approach 2:
The invention creates a composite structure combining carbon material with substrate material (such as plastic or metal). This composite approach allows the carbon component to be extremely thin for high energy density while the substrate component provides the necessary structural strength, achieving both goals simultaneously.
3Reliability
If insulator sheets are placed between carbon plates, then short circuits are prevented, but total surface area for charge accumulation is reduced
Solution Approach 1:
The patent extracts or removes the insulator sheet from the traditional sandwich structure. Instead of placing insulators between electrodes, the invention uses the substrate itself as the insulating barrier, eliminating the need for separate insulator layers and thereby maximizing the total surface area available for charge accumulation while still preventing short circuits.
Solution Approach 2:
The invention merges the substrate and insulator functions into a single integrated component. The substrate serves both as the mechanical support and as the insulating barrier between electrodes, eliminating the need for separate insulator sheets and maximizing the usable surface area for energy storage.
4Ease of manufacture
If traditional stack construction is used, then manufacturing is simplified, but production cost remains high
Solution Approach 1:
The patent replaces mechanical assembly processes (stacking, aligning, and fastening multiple rigid components) with a printing-based manufacturing process. Carbon patterns are directly printed onto flexible substrates, and electrolyte is printed or infused, eliminating complex mechanical assembly steps and significantly reducing production costs while maintaining manufacturing simplicity.
Solution Approach 2:
The invention changes the manufacturing approach from macro-scale mechanical assembly to micro-scale printing processes. By using printing technologies to deposit carbon patterns and electrolyte directly onto substrates, the process achieves both simplicity and cost-effectiveness, as printing can be automated and scaled efficiently.
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 results in a significant increase in energy density, power density, and cost reduction, while simplifying the manufacturing process and improving mechanical resistance and charge/discharge performance, making graphene-based supercapacitors a viable replacement for lithium-ion batteries.
Implementation Method 1
Two carbon based electrodes are put in contact with a suitable electrolyte that accumulates charge via an electrostatic process
Implementation Method 2
layering the element sheet with photoresist on one or both sides; exposing portions of the photoresist to a light source to remove these portions from the element sheet
Data Source
AI summary
Improvements in design and manufacturing techniques to produce a graphene based prismatic supercapacitor of very high capacitance with very high energy density storage able to outperform and replace the cutting edge batteries available in the market today.