Abstract
AbstractThe electric double-layer capacitor (EDLC) is an energy storage device that uses the movement of ions and is a battery with minimal deterioration. The increase of electrostatic capacity and the reduction of internal resistance are necessary for the use of ELDCs in various fields. The performance of EDLC is evaluated using 12 characteristics of separators. EDLC was measured by using the time constant method. The material, porosity, thickness, and hydrophilic processing (i.e. plasma hydrophilic treatment or fluorine gas hydrophilic treatment) of the separator changed. Four important points were observed. First, the capacitance was changed by the amount of the electrolyte retained by the separator. Second, polyphenylene sulfide is a suitable fiber for the retention of electrolyte. Third, the capacitance increased with the application of a plasma hydrophilic treatment on the separator. Finally, thickness affects the capacitance more than porosity does.
Highlights
Numerous researchers have shown interest in electric double-layer capacitors (EDLCs) in recent years
This paper evaluated a separator using ionic liquid and sulfuric acid
The following results were obtained: (1) The capacitance increases with the application of plasma hydrophilic treatment for a separator
Summary
Numerous researchers have shown interest in electric double-layer capacitors (EDLCs) in recent years. The EDLC has low energy density and power. To ensure that EDLCs can be used in a wide range of fields, its electrostatic capacity must be increased, and its internal resistance must be reduced. The electrostatic capacity limit is 200 Fg−1 in an organic electrolyte.[1] A clear theory for the power storage limitations of EDLC has not been published. Researchers have conducted extensive research to improve capacitor performance in the electrode and electrolyte of EDLC.[1,2,3,4,5,6] Several studies have proven that the electrode is thick and has increased capacitance.[3,4] studies report that capacitance is increased when graphite is used for the polarizable electrode.[4] Studies have reported that a hydrocarbon electrolytic solution is produced by mixing sulfuric acid and mineral oil; this solution achieves higher performance than aqueous electrolytic solutions, such as sulfuric acid.[2] few studies on separators are available. This paper attempts to evaluate capacitor performance and electrical characteristics by using separators with various characteristics
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