Correlation between the capacitor performance and pore structure

Kim, Yong Jung; Tantrakarn, Kriengkamol; Abe, Yusuke; Yanagiura, Takashi; Takeuchi, Kenji; Oshida, Kyoichi; Endo, Morinobu

doi:10.7209/tanso.2006.31

“…The capacitor cell 1000F is representative of commercial capacitors using conventional AC materials. [20] This high performance originates from the new activation mechanism of MPCF with KOH. The 2100F cell has an extremely high electrode density of 0.85 g cm À3 .…”

Section: Resultsmentioning

confidence: 99%

Edge‐Enriched, Porous Carbon‐Based, High Energy Density Supercapacitors for Hybrid Electric Vehicles

Kim

¹

,

Yang

²

,

Park

³

et al. 2012

Self Cite

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Supercapacitors can store and deliver energy by a simple charge separation, and thus they could be an attractive option to meet transient high energy density in operating fuel cells and in electric and hybrid electric vehicles. To achieve such requirements, intensive studies have been carried out to improve the volumetric capacitance in supercapacitors using various types and forms of carbons including carbon nanotubes and graphenes. However, conventional porous carbons are not suitable for use as electrode material in supercapacitors for such high energy density applications. Here, we show that edge-enriched porous carbons are the best electrode material for high energy density supercapacitors to be used in vehicles as an auxiliary powertrain. Molten potassium hydroxide penetrates well-aligned graphene layers vertically and consequently generates both suitable pores that are easily accessible to the electrolyte and a large fraction of electrochemically active edge sites. We expect that our findings will motivate further research related to energy storage devices and also environmentally friendly electric vehicles.

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“…[4][5][6] However, the number of activated carbon pores and other parameters are dependent on the activated carbon that is used, the electrode composition ratio, the electrode porosity, and the like. [4][5][6] However, the number of activated carbon pores and other parameters are dependent on the activated carbon that is used, the electrode composition ratio, the electrode porosity, and the like.…”

Section: Activated Carbon Pore Modeling and Edlc Equivalent Circuit Mmentioning

confidence: 99%

“…It has also been reported that ion transport is restricted when the pore size is small, 4,13 and that pore diameters of about 5 to 8 times the ion diameter are necessary to form an electric double layer. It has also been reported that ion transport is restricted when the pore size is small, 4,13 and that pore diameters of about 5 to 8 times the ion diameter are necessary to form an electric double layer.…”

Section: Edlc Pulsed Charging Simulationmentioning

confidence: 99%

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Development of Equivalent Circuit Model for Electric Double-Layer Capacitors Reflecting Pore Structure of Activated Carbon

Kono

¹

,

Tanaka

²

,

Urushibata

³

et al. 2018

IEEJ Trans. IA

0

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In this study, an equivalent circuit model of electric double-layer capacitors (EDLCs) reflecting a branched-pore structure for activated carbon was developed. Geometrical parameters such as pore diameter, pore depth, and branch number of the macropore, mesopore, and micropore were estimated from the analysis of the electrochemical impedance for EDLCs, combining theoretical equations and an equivalent circuit model. The developed equivalent circuit model was applied to charge/discharge simulations of EDLCs. The experimental and simulated cell voltages during pulsed-current charge were found to be in excellent agreement. Distributions of currents and voltages in the macropore, mesopore, and micropore during pulsed-current charges were discussed using equivalent circuit simulations. Electric-double layers were charged in order of the macropore, the mesopore, and the micropore. It was suggested that charge delays of the mesopore and the micropore originated from both solution resistances in pores and the branch structure of the pore for activated carbon. K E Y W O R D Scharge/discharge simulation, electric double-layer capacitor, equivalent circuit, pore structure of activated carbon Electron Comm Jpn. 2019;102:47-56.

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“…In many cases, EDLC electrodes are manufactured using activated carbon fine particles that have a large surface area (hereinafter abbreviated as “activated carbon”) for the purpose of increasing the capacity. In the activated carbon, pores called macropores, mesopores, and micropores, which are self‐similarly branched pores, are formed, thereby creating a large surface area of around 2000 m 2 /g . The diameter of these pores is generally accepted to be 50 nm or greater for the macropores, 2 to 50 nm for the mesopores, and 2 nm or less for the micropores .…”

Section: Introductionmentioning

confidence: 99%

Development of equivalent circuit model for electric double‐layer capacitors reflecting pore structure of activated carbon

Kono

¹

,

Tanaka

²

,

Urushibata

³

et al. 2019

Elect Comm in Japan

0

View full text Add to dashboard Cite

In this study, an equivalent circuit model of electric double-layer capacitors (EDLCs) reflecting a branched-pore structure for activated carbon was developed. Geometrical parameters such as pore diameter, pore depth, and branch number of the macropore, mesopore, and micropore were estimated from the analysis of the electrochemical impedance for EDLCs, combining theoretical equations and an equivalent circuit model. The developed equivalent circuit model was applied to charge/discharge simulations of EDLCs. The experimental and simulated cell voltages during pulsed-current charge were found to be in excellent agreement. Distributions of currents and voltages in the macropore, mesopore, and micropore during pulsed-current charges were discussed using equivalent circuit simulations. Electric-double layers were charged in order of the macropore, the mesopore, and the micropore. It was suggested that charge delays of the mesopore and the micropore originated from both solution resistances in pores and the branch structure of the pore for activated carbon. K E Y W O R D Scharge/discharge simulation, electric double-layer capacitor, equivalent circuit, pore structure of activated carbon Electron Comm Jpn. 2019;102:47-56.

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Correlation between the capacitor performance and pore structure

Cited by 8 publications

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Edge‐Enriched, Porous Carbon‐Based, High Energy Density Supercapacitors for Hybrid Electric Vehicles

Edge‐Enriched, Porous Carbon‐Based, High Energy Density Supercapacitors for Hybrid Electric Vehicles

Development of Equivalent Circuit Model for Electric Double-Layer Capacitors Reflecting Pore Structure of Activated Carbon

Development of equivalent circuit model for electric double‐layer capacitors reflecting pore structure of activated carbon

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