Macroporous Activated Carbon Electrodes for High-Energy Supercapacitors
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Solution Overview
Problem
Electrochemical supercapacitors face high costs per kWh, limiting their widespread adoption due to high production costs compared to lithium-ion batteries, which hinders their use in various applications.
Innovation Solution
The development of carbon-based electrodes with activated carbon substrates and laser-scribed microchannels, combined with redox-active electrolytes, enhances areal and gravimetric capacitance, reducing internal resistance and increasing energy storage efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional supercapacitor electrodes are used, then high power density is achieved, but high cost per kWh limits widespread adoption
Solution Approach 1:
The patent employs activated carbon with a highly porous structure containing macropores (larger than 50 nm) that enable efficient electrolyte penetration and ion transport. This porous architecture increases the effective surface area for charge storage while maintaining low material cost, resolving the contradiction between achieving high power density and reducing cost per kWh
Solution Approach 2:
The patent creates a composite electrode structure combining activated carbon particles with a conductive matrix material. This composite approach enhances electrical conductivity and mechanical stability while utilizing cost-effective materials, allowing high power density performance without the high costs associated with traditional supercapacitor materials
2Quantity of substance
If electrode density is increased to improve energy density, then more energy is stored, but ionic impedance increases reducing charge/discharge speed
Solution Approach 1:
The patent utilizes activated carbon with a hierarchical porous structure that includes macropores (>50 nm) serving as ion transport highways. These large pores reduce ionic impedance by facilitating rapid electrolyte flow and ion access to the electrode interior, while the overall high porosity provides extensive surface area for energy storage, thus increasing energy density without compromising charge/discharge kinetics
Solution Approach 2:
The patent introduces a three-dimensional macroporous network architecture that adds spatial dimensionality to ion transport pathways. This 3D porous structure enables ions to access deep within the electrode through multiple dimensional pathways, reducing the tortuosity and resistance that would otherwise limit fast charging while maintaining high energy density
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 high-energy density storage devices with improved performance, reduced costs, and extended cycle stability, making them viable alternatives to traditional batteries in various applications.
Implementation Method 1
generating a light beam having a power density to generate one or more channels in the activated carbon substrate
Implementation Method 2
activated carbon substrate comprises activated carbon, activated charcoal, activated carbon cloth, activated carbon fiber, activated glassy carbon, activated carbon nanofoam, activated carbon aerogel
Data Source
Figure 1A~1D
Figure 2A~2D
Figure 3A~3F
AI summary
Energy storage devices comprising carbon-based electrodes and/or redox electrolytes are disclosed herein. In some embodiments, the carbon-based electrodes comprise laser-scribed activated carbon comprising one or more micro-channels. In some embodiments, the redox electrolytes comprise a ferricyanide/ferrocyanide redox couple. Also described are processes, methods, protocols and the like for manufacturing carbon- based electrodes comprising micro-channels for use in high energy storage devices such as supercapacitors, and for manufacturing high energy storage devices comprising redox electrolytes.