Carbon Nanotube-Infused Supercapacitor Electrodes
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Solution Overview
Problem
Conventional supercapacitors using activated carbon particles have limitations in increasing electrode surface area and charge storage capabilities due to the size and pore restrictions of the particles, which restricts the potential for higher capacitance values.
Innovation Solution
The use of carbon nanotubes infused into substrates, forming a layered structure wound in a spiral configuration, provides a higher effective surface area and enhanced electrical storage capabilities by allowing larger quantities of carbon nanotubes to be integrated into supercapacitors, overcoming the limitations of activated carbon particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If activated carbon particles are used as electrode substrate, then high surface area is achieved, but charge carrier penetration is restricted due to pore size limitations
Solution Approach 1:
The patent employs porous activated carbon particles as electrode substrate, utilizing their inherent porous structure to provide high surface area. The pores are engineered to allow penetration by charge carriers of appropriate sizes, resolving the contradiction between maximizing surface area and enabling charge carrier access.
Solution Approach 2:
The electrode is constructed as a composite material system combining activated carbon particles with electrolyte containing charge carriers. This composite structure allows the carbon particles to provide surface area while the electrolyte matrix enables charge carrier transport throughout the electrode volume.
2Quantity of substance
If carbon nanotubes are randomly dispersed in electrolyte, then small quantities can be incorporated, but electrical storage capability remains low
Solution Approach 1:
The patent extracts carbon nanotubes from random dispersion in electrolyte and relocates them to be integrated within the electrode structure itself. This extraction from the electrolyte phase and incorporation into the electrode phase allows for much higher concentrations of carbon nanotubes while maintaining electrical storage capability.
Solution Approach 2:
The patent uses a binder material as an intermediary to incorporate and hold carbon nanotubes within the electrode structure. This binder mediates between the carbon nanotubes and the electrode substrate, enabling stable integration of large quantities of nanotubes that would otherwise be difficult to incorporate.
3Use of energy by moving object
If large quantities of carbon nanotubes are integrated into electrode, then electrical storage capability is enhanced, but fabrication complexity increases
Solution Approach 1:
The patent merges the incorporation of carbon nanotubes with the existing electrode fabrication process. By integrating nanotube inclusion into the standard electrode manufacturing steps rather than adding separate complex processes, the fabrication complexity is minimized while still achieving large quantities of incorporated nanotubes.
Solution Approach 2:
The electrode fabrication process is designed to self-incorporate carbon nanotubes through the existing mixing and assembly steps. The process naturally integrates nanotubes into the electrode structure during normal manufacturing operations, eliminating the need for specialized additional processing steps.
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 significantly increases the capacitance of supercapacitors, enabling higher energy storage and rapid charge/discharge cycles, making them suitable for applications like solar energy collection and hybrid gas-electric vehicles.
Implementation Method 1
Many conventional supercapacitors presently use activated carbon particles as a high surface area substrate to hold charge carriers from an electrolyte dispersed therein. Although activated carbon particles have a high surface area, certain charge carriers are too large to penetrate the porous interior of the activated carbon particles and take advantage of its high surface area.
Implementation Method 2
The first electrode material and the second electrode material are wound in a spiral configuration about a central axis.
Data Source
AI summary
Electrical devices having electrodes containing carbon nanotubes infused to a substrate are described herein. The electrical devices contain at least a first electrode material containing a first plurality of carbon nanotubes infused to a first substrate and a second electrode material containing a second plurality of carbon nanotubes infused to a second substrate. The first electrode material and the second electrode material are wound in a spiral configuration about a central axis. The electrical devices can be supercapacitors, which also contain at least an electrolyte in contact with the first electrode material and the second electrode material, and a first separator material disposed between the first electrode material and the second electrode material. Methods and apparatuses for making the electrical devices are also disclosed herein.