Co-Continuous Porous Carbon for Electrochemical Capacitors
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Solution Overview
Problem
Conventional activated carbon electrodes for electrochemical capacitors suffer from flocculation, limited surface contact area, and increased flow resistance, which hinder high electrostatic capacitance and rapid charging/discharging capabilities due to insufficient porous structure evenness.
Innovation Solution
A porous carbon material with a co-continuous structural portion, where both carbon skeletons and voids form continuous structures, enhancing surface utilization efficiency and electrolyte ion mobility, thereby improving electrostatic capacitance and high-rate characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If activated carbon is used in particulate or powder form, then the electrode can be manufactured easily, but the activated carbon flocculates and has limited contact area with electrolytic solution, reducing electrostatic capacitance
Solution Approach 1:
The patent employs porous carbon material with a specific pore structure where pores are formed throughout the carbon matrix, allowing electrolytic solution to penetrate deeply and increase effective contact area. This porous structure resolves the contradiction by maintaining manufacturability while dramatically increasing the active surface area available for charge storage, thereby increasing electrostatic capacitance without requiring more material.
Solution Approach 2:
The patent transitions from using discrete particulate or powder activated carbon to a continuous porous carbon structure. This dimensional transformation creates a three-dimensional network of interconnected pores throughout the electrode, enabling electrolyte access to internal surfaces that would be inaccessible in flocculated particulate forms, thus increasing capacitance while maintaining ease of manufacture.
2Ease of manufacture
If activated carbon is used in particulate or powder form, then the electrode can be manufactured easily, but flow resistance of electrolytic solution increases, adversely affecting high-speed charging and discharging characteristics
Solution Approach 1:
The porous carbon material features an interconnected pore network that provides multiple flow pathways for the electrolytic solution. This structure reduces flow resistance by preventing dead ends and bottlenecks that occur in flocculated particulate structures, enabling rapid ion transport while maintaining the ease of manufacture associated with conventional activated carbon processing.
Solution Approach 2:
The patent creates a continuous porous structure throughout the carbon material, ensuring uninterrupted pathways for electrolyte flow. This continuity eliminates the discontinuous, blocked pathways inherent in particulate forms, allowing sustained high-speed charging and discharging while preserving manufacturing simplicity.
3Area of stationary object
If activated carbon has many pores formed on its surface to have a high specific surface area, then the surface area increases, but the pores are not in communication, so that the surfaces inside the flocculated activated carbons are not in use
Solution Approach 1:
The patent employs porous carbon material with interconnected pores that allow electrolytic solution to access internal surfaces. This interconnected pore structure ensures that the high specific surface area is effectively utilized, as electrolyte can penetrate throughout the carbon matrix and contact all available surface area, resolving the issue of unused internal surfaces in conventional activated carbon.
Solution Approach 2:
The porous structure acts as an intermediary that facilitates access between the electrolytic solution and the internal surfaces of the carbon material. The interconnected pores serve as channels that mediate the transport of electrolyte to otherwise inaccessible surfaces, enabling full utilization of the high specific surface area for charge storage.
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
The co-continuous structural portion allows for higher electrostatic capacitance and faster charging/discharging, while maintaining structural integrity and reducing internal resistance, thus addressing the limitations of conventional activated carbon electrodes.
Implementation Method 1
Physical adsorption and desorption of electrolyte ions to the activated carbon causes charging and discharging
Data Source
AI summary
The present invention provides an electrode material for an electrochemical capacitor having high surface utilization efficiency, composed of a porous carbon material capable of further contributing to higher electrostatic capacitance of the electrochemical capacitor and to development of high rate characteristics; the porous carbon material having a co-continuous structural portion in which a carbon skeleton and voids form respective continuous structures, the co-continuous structural portion having a structural period of 0.002 μm to 20 μm.