Ultracapacitor Electrode Cavities for Drying and Impregnation
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Solution Overview
Problem
Current double-layer capacitor designs face challenges in delivering high power output and energy density quickly while maintaining low electrode equivalent series resistance (ESR) and high operating voltage, with prolonged drying times and inefficient electrolytic solution impregnation increasing manufacturing costs and time.
Innovation Solution
The method involves forming carbon film elements with predetermined thickness and punching cavities onto them, which are then affixed to electrode foil elements, facilitating faster drying and more efficient electrolyte impregnation, thereby reducing ESR and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional solid carbon film electrodes are used, then structural integrity is maintained, but drying time is prolonged and electrolyte impregnation efficiency is reduced
Solution Approach 1:
The patent applies porous materials by incorporating a porous layer containing porous particles (such as activated carbon, carbon black, or metal oxides) within the carbon film electrode structure. These porous particles create interconnected void spaces that facilitate rapid electrolyte penetration and absorption, significantly improving impregnation efficiency while maintaining structural integrity through the binder matrix.
Solution Approach 2:
The patent segments the carbon film electrode into a composite structure consisting of conductive polymer binder, porous particles, and interconnected void spaces. This segmentation creates a hierarchical pore structure that enables efficient electrolyte distribution throughout the electrode volume, reducing drying time while maintaining mechanical strength.
2Quantity of substance
If electrode thickness is increased to improve energy density, then energy storage capacity increases, but drying time and manufacturing complexity increase
Solution Approach 1:
The patent uses porous particles and porous layers to create a three-dimensional pore network within thicker electrodes. This network provides multiple pathways for electrolyte penetration deep into the electrode structure, enabling efficient impregnation and drying even in thick electrodes, thereby achieving high energy density without proportionally increasing manufacturing time.
Solution Approach 2:
The patent transitions from a two-dimensional planar electrode structure to a three-dimensional composite structure with porous particles distributed throughout the carbon film. This dimensional change creates vertical and lateral pore channels that facilitate rapid electrolyte transport in thicker electrodes, decoupling energy density from drying time.
3Productivity
If porous structure is added to reduce drying time, then electrolyte impregnation improves, but ESR may increase due to reduced electrical conductivity
Solution Approach 1:
The patent employs composite materials by combining conductive polymer binders (such as polyaniline, polythiophene, or polypyrrole) with porous particles (activated carbon, carbon black, metal oxides). This composite structure creates a dual-function material where the conductive polymer matrix maintains electrical conductivity and connects porous particles, while the porous particles provide electrolyte access, thereby reducing ESR while improving impregnation efficiency.
Solution Approach 2:
The patent applies local quality by creating regions of high porosity within the carbon film electrode where porous particles are concentrated, while maintaining continuous conductive polymer pathways throughout the structure. This localized porous structure optimizes electrolyte access at specific sites without compromising overall electrical conductivity, balancing ESR and impregnation efficiency.
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 reduces electrode drying time, improves impregnation efficiency, lowers manufacturing costs, and enhances the stability and lifespan of energy storage devices by minimizing ESR and allowing for higher power output and energy density.
Implementation Method 1
Both processes are crucial for longer lifetime and reduced manufacturing cost of ultracapacitor products
Implementation Method 2
Both the separator and the electrodes are impregnated with an electrolytic solution. This allows ionic current to flow between the electrodes through the separator
Data Source
AI summary
An electrode structure adapted for use in a ultracapacitor energy storage device, which expedites electrode drying time and improves impregnation of the electrode structure, is disclosed. In one embodiment, the electrode structure comprises a carbon film element having a plurality of cavities disposed thereon. In another embodiment, a plurality of channels is punched into a carbon film element of the electrode structure.