Basic Characteristic of Electric Double Layer Capacitor Mixing Ketjen Black as Conducting Filler

Tashima, Daisuke; Kurosawatsu, Kenji; Taniguchi, M.; Uota, Masafumi; Otsubo, Masahisa

doi:10.1541/ieejfms.127.487

“…It is well known that the relationship between the pore diameter and the ion diameter in the electrolytic solution largely affects the cell characteristics in an EDLC that comprises porous carbon electrodes. It has also been reported that ion transport is restricted when the pore size is small, and that pore diameters of about 5 to 8 times the ion diameter are necessary to form an electric double layer . The simulation results obtained from our model also suggest that ion transport in pores with small pore diameters significantly affects the EDLC characteristics.…”

Section: Resultssupporting

confidence: 57%

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

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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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“…36 The lower polarization compared with that of Pt/K + -ISM may be attributed to the charge storage of the double-layer capacitance at the surface of the high-resistance KTP, which is electrically connected by contact with the Pt substrate. 39 In contrast, the Pt/AB/K + -ISM and Pt/KTP-AB/K + -ISM electrodes (with AB added to the SC layer) showed a remarkably small polarization of less than 5 mV after 300 s. As carbon materials, such as AB have high electronic conductivity and high specific surface area, 37 their double-layer capacitance at the AB/ISM interface suppresses polarization. 39 Thus, these carbon materials act as ion-to-electron transducers, as reported in the literature.…”

Section: Resultsmentioning

confidence: 99%

Application of Potassium Ion Conducting KTiOPO₄ as Effective Inner Solid-Contact Layer in All-Solid-State Potassium Ion-Selective Electrode

Tatara

¹

,

Ishihara

²

,

Kosugi

³

et al. 2023

J. Electrochem. Soc.

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Solid electrolytes used in all-solid-state batteries electronically separate the positive and negative electrodes in the battery and only allow the carrier ions to pass through. KTiOPO4 (KTP), a potassium ion-conducting solid electrolyte, was first applied as the inner solid contact layer of an all-solid-state potassium ion-selective electrode (ISE) to stabilize the membrane potential. Application of the KTP layer improved the long-term potential stability of the ISE by stabilizing the membrane potential. This can be further improved by adding acetylene black (AB) to the KTP layer which reduced the electrode resistance owing to its high double-layer capacitance.

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“…6, 7, 9, and 11, C dl ** = 3.0 × 10 −5 F/cm 2 and, based on Ref. Under these parameters, n was estimated as n = 1.28 × 10 14 . Figure 5 shows the experimental and simulation values.…”

Section: Edlc Impedance Simulationmentioning

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. 2018

IEEJ Trans. IA

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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Basic Characteristic of Electric Double Layer Capacitor Mixing Ketjen Black as Conducting Filler

Cited by 5 publications

References 11 publications

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

Application of Potassium Ion Conducting KTiOPO₄ as Effective Inner Solid-Contact Layer in All-Solid-State Potassium Ion-Selective Electrode

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

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Basic Characteristic of Electric Double Layer Capacitor Mixing Ketjen Black as Conducting Filler

Cited by 5 publications

References 11 publications

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

Application of Potassium Ion Conducting KTiOPO4 as Effective Inner Solid-Contact Layer in All-Solid-State Potassium Ion-Selective Electrode

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

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Application of Potassium Ion Conducting KTiOPO₄ as Effective Inner Solid-Contact Layer in All-Solid-State Potassium Ion-Selective Electrode