Electrospun Nanofiber Supercapacitor Electrodes
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Solution Overview
Problem
Conventional organic thin film supercapacitors face a trade-off between charge capacity and charging/discharging rates, where increasing one property necessarily decreases the other, limiting their energy and power density.
Innovation Solution
The use of electrospun fibers with high surface area, combined with ionic liquids and conductive polymers, to create a bulk material that enhances charge storage capacity without sacrificing rapid charging and discharging rates, achieved through Proximity Field Nano Patterning (PnP) and electrospinning techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If film thickness is increased to increase charge capacity, then charge capacity is improved, but charging and discharging rates deteriorate
Solution Approach 1:
The patent segments the continuous thin film into discrete nanofibers with diameters of 50-500 nm. This segmentation creates numerous individual charge storage units distributed throughout the film, allowing charges to be stored in multiple locations simultaneously while maintaining short transport distances to electrodes, thereby resolving the contradiction between charge capacity and charging/discharging rates.
Solution Approach 2:
The patent transitions from a two-dimensional continuous film to a three-dimensional network of nanofibers. This dimensional change increases the effective surface area and volume for charge storage while maintaining nanoscale dimensions that enable rapid ion transport, simultaneously achieving high charge capacity and fast charging/discharging rates.
2Use of energy by moving object
If film thickness is increased to increase energy density, then energy density is improved, but power density deteriorates
Solution Approach 1:
By segmenting the film into nanofibers, the patent enables increased energy density through greater material utilization while maintaining high power density via the nanoscale dimensions that facilitate rapid energy transfer to and from the electrodes, eliminating the traditional trade-off between energy and power density.
Solution Approach 2:
The nanofiber network creates an inherently porous structure with high surface area to volume ratio, allowing electrolyte penetration throughout the film thickness. This porous architecture enables both high energy density (through increased active material volume) and high power density (through efficient ion transport pathways).
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 high surface area electrode that maintains high energy density and fast response times, similar to thick electrodes, while offering increased usable volume, effectively addressing the limitations of traditional thin film supercapacitors.
Implementation Method 1
Electro spinning is a materials processing method where the resulting product is a fiber
Implementation Method 2
The electrochemical charging and discharging of the thin films are rather predictable
Data Source
AI summary
An apparatus and method for the uniform dispersion of nano scaled redox particles in a conductive fiber including, combining at least one nano sized redox capable material having metal oxides and/or metals, at least one conductive binder, and at least one solvent to form electrically conductive metal imbedded fiber(s) by fiber spinning and the conductive polymeric binder having a molecular weight greater than 20,000 Daltons, and coating a substrate with the electrically conductive fiber(s) to form an active layer substrate complex having a conductivity greater than 0.05 S/cm.