Composite Electrode Structure for High Energy Density Capacitors
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Solution Overview
Problem
Conventional energy storage systems face challenges in configuring a single-type energy storage system due to low energy density of batteries and low capacitance of electric double layer capacitors, which limits their ability to compensate for high energy peaks and store electric charges effectively.
Innovation Solution
An energy storage capacitor with a composite electrode structure is designed by internally connecting electrodes of electric double layer capacitors and hybrid capacitors in parallel within a case, incorporating activated carbon and lithium titanium oxide layers, along with separators and electrolytes, to enhance capacitance and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If only electric double layer capacitor is used, then output density is high, but energy density is low
Solution Approach 1:
The patent combines electric double layer capacitor electrodes (activated carbon) and hybrid capacitor electrodes (lithium titanium oxide) into a single composite electrode structure. The first electrode assembly contains both activated carbon layers and lithium titanium oxide layers, merging the high output density characteristic of electric double layer capacitors with the high energy density characteristic of hybrid capacitors, thereby resolving the contradiction between output density and energy density
Solution Approach 2:
The patent uses composite electrode materials consisting of both activated carbon and lithium titanium oxide in the same electrode assembly. This composite material approach allows the capacitor to exhibit both the high power density of activated carbon-based electric double layer capacitors and the high energy density of lithium titanium oxide-based hybrid capacitors, simultaneously improving both output density and energy density
2Quantity of substance
If only battery is used, then energy density is high, but output density is low
Solution Approach 1:
The patent merges battery technology (lithium titanium oxide) with electric double layer capacitor technology (activated carbon) in a single composite electrode structure. This combination allows the energy storage device to achieve high energy density from the lithium titanium oxide while maintaining high output density from the activated carbon, resolving the contradiction between energy density and output density that limits battery performance
3Adaptability or versatility
If only hybrid capacitor is used, then intermediate electric characteristic is achieved, but capacitance is limited
Solution Approach 1:
The patent combines hybrid capacitor electrodes (lithium titanium oxide) and electric double layer capacitor electrodes (activated carbon) in parallel within the same assembly. This merging approach allows the device to achieve the intermediate electric characteristics of hybrid capacitors while simultaneously increasing total capacitance through the additive effect of both electrode types working together
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 configuration increases capacitance compared to electric double layer capacitors and output compared to hybrid capacitors, while improving equivalent series resistance, enabling more efficient energy storage and discharge performance.
Implementation Method 1
it stores electric charges through physical adsorption and desorption of ions
Data Source
AI summary
An energy storage capacitor having a composite electrode structure includes: a case; a rolled body arranged inside the case; and an electrolyte stored inside the case. The rolled body includes: a first anode foil having a first anode lead plate connected at one side of one surface, a first cathode foil arranged to face the other surface of the first cathode foil with the one surface of the first anode foil and a first cathode lead plate connected at the other side, a second cathode foil arranged to face the other surface of the second cathode foil with one surface of the first cathode foil and having a second cathode lead plate connected at one side of one surface, a second anode foil arranged to face the one surface of the second cathode foil and a second anode lead plate connected at the other side.