Electric Double Layer Capacitor Anode Conductive Layer
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Solution Overview
Problem
Current methods for electric double layer capacitors (EDLCs) are limited in adjusting the potential difference between the cathode and anode, which restricts the improvement of voltage and energy density.
Innovation Solution
Incorporating a conductive layer with specific electrical conductivity on the anode current collector, reducing resistance and allowing for a potential difference adjustment between the cathode and anode by using conductive carbon materials like ketjen black or super-P, and applying active materials such as activated carbon with high specific surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the thickness of cathode active material is increased to adjust electrode potential, then cell voltage is improved, but resistance difference between cathode and anode cannot be effectively controlled
Solution Approach 1:
The invention applies different conductive materials with specific electrical conductivities to the anode and cathode electrodes locally. The anode uses a conductive material with electrical conductivity of 10^-2 to 10^-3 S/cm, while the cathode uses a different conductive material, creating local electrical property differences that enable effective potential difference adjustment without relying solely on thickness variations.
Solution Approach 2:
The invention changes the electrical conductivity parameter of the conductive materials used in the electrodes. By selecting conductive materials with specific conductivity ranges (10^-2 to 10^-3 S/cm for the anode), the invention directly controls the resistance characteristics of each electrode, enabling precise adjustment of potential difference and improving both cell voltage and reliability.
2Ease of manufacture
If conventional electrode potential adjustment methods are used, then manufacturing simplicity is maintained, but energy density and voltage improvement are limited
Solution Approach 1:
The invention changes the electrical conductivity parameter of the conductive materials to achieve better performance. By using conductive materials with optimized conductivity (10^-2 to 10^-3 S/cm) and controlling their thickness (1 to 15 μm), the invention simultaneously maintains ease of manufacture through standard coating processes while significantly improving energy density and voltage.
Solution Approach 2:
The invention uses composite electrode structures combining conductive materials with specific properties. The anode comprises a current collector with a conductive material layer having controlled thickness and conductivity, creating a composite structure that balances manufacturability with enhanced electrical performance and 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 reduces anode resistance, minimizes capacity reduction, and enhances the energy density and withstand voltage of the EDLC by creating a resistance difference between the cathode and anode, thereby improving overall performance.
Implementation Method 1
The conductive layer may be formed by applying a conductive material with electrical conductivity of 10−2 to 10−3 S/cm
Implementation Method 2
Electric double layer capacitor including: an anode formed by applying a conductive layer and an anode active material layer on an anode current collector
Data Source
AI summary
An electric double layer capacitor includes an anode and a cathode. The anode includes an anode current collector, and a conductive layer and an anode active material layer, on the anode current collector. The cathode includes a cathode current collector and a cathode active material layer on the cathode current collector. The conductive layer includes a conductive material with electrical conductivity of 10−2 to 10−3 S/cm.