Use of Fluoroethylene Carbonate as Solvent for Electric Double-Layer Capacitors

Nanbu, Noritoshi; Suzuki, Keita; Yagi, Nobuyoshi; Sugahara, Michimasa; Takehara, Masahiro; Ue, Makoto; Sasaki, Yukio

doi:10.5796/electrochemistry.75.607

Cited by 16 publications

(4 citation statements)

References 15 publications

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“…However, capacitance was decreased at FEC amounts over 2 vol %. FEC maybe bring a decreased solvation of electrolyte ions, 19 and the SEI film between the electrode and electrolyte was excessively formed or became thicker. Figure 2 shows the impedance plots for the carbon in the electrode with different electrolyte compositions.…”

Section: Resultsmentioning

confidence: 99%

Fluoroethylene Carbonate Addition Effect on Electrochemical Properties of Mixed Carbonate-based Organic Electrolyte Solution for a Capacitor

Kim¹,

Kim²,

Yang³

et al. 2014

Bulletin of the Korean Chemical Society

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In this paper, organic solvent electrolytes were prepared by a mixture of propylene carbonate (PC), dimethyl carbonate (DMC), tetraethylammonium tetrafluoroborate (TEABF 4 ) as a salt, and by containing a different content of fluoroethylene carbonate (FEC) as an additive agent. The aim of this paper is to evaluate the ionic properties of propylene carbonate (PC)/dimethyl carbonate (DMC) mixtures as solvents for a capacitor application, in view of improving the electrochemical performances. The bulk resistance and interfacial resistance of the mixture electrolytes were investigated using an AC impedance method. The morphology of carbon-based electrodes which were contained in different electrolytes was analyzed by scanning electron microscopy (SEM) method. From the experimental results, by increasing the FEC content, capacitance of electrodes was increased, and the interfacial resistance was decreased. In particular, by a content of 2 vol % FEC in 0.2 M TEABF 4 PC/DMC solvent, the electrolyte showed the superior capacitance. However, when FEC content exceeds 2 vol %, the capacitance was decreased and the interfacial resistance was increased.

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Section: Resultsmentioning

confidence: 99%

Fluoroethylene Carbonate Addition Effect on Electrochemical Properties of Mixed Carbonate-based Organic Electrolyte Solution for a Capacitor

Kim¹,

Kim²,

Yang³

et al. 2014

Bulletin of the Korean Chemical Society

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“…3,4 We previously reported that the use of fluoroethylene carbonate (FEC) as a single solvent increased capacitance of EDLCs. 5 In the present paper, we describe the effect of different structures on the physical and electrolytic properties of cyclic carbonates: PC, TMC, EC, and BC. The relative permittivities, molar concentrations, viscosities, and ionic conductivities of the solvents or the electrolytic solutions are shown as a function of temperature.…”

Section: Introductionmentioning

confidence: 99%

Physical and Electrolytic Properties of Different Cyclic Carbonates as Solvents for Electric Double-Layer Capacitors

2013

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Propylene carbonate (PC) is commonly used as a single solvent for electric double-layer capacitors (EDLCs). Trimethylene carbonate (TMC) and PC are isomeric with each other: structural isomerism, which is especially called metamerism. TMC has a six-membered ring and is solid below 48°C. The relative permittivity of a PC-TMC equimolar binary mixture was highest in the four systems of solvents: PC-TMC > PC-ethylene carbonate (EC) > PC > buthylene carbonate (BC). Despite the lower ionic conductivity, the use of a tetraethylammonium tetrafluoroborate (TEABF 4 ) solution in PC-TMC increased gravimetric capacitance of a coin cell. TMC may weaken solvation of electrolyte ions, and the electrolyte ions can closely approach the electrode in a compact double layer.

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“…3 A methoxymehyl group (CH 3 OCH 2 -) as well as a fluorine group (F-) are polar groups and electron-withdrawing substituents. The methoxymethyl group can exert the polar effect on the physical and electrochemical properties such as relative permittivity, viscosity, and ionic conductivity.…”

Section: Introductionmentioning

confidence: 99%

Effect of Methoxy Group on Physical and Electrolytic Properties of Propylene Carbonate

Nambu

Kobayashi

et al. 2013

Electrochemistry

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A methoxymethyl group (CH 3 OCH 2 -) can exert the polar effect on the physical and electrochemical properties. We have investigated the effect of the substitution of a methyl group with a methoxymethyl group on the physical and electrolytic properties of propylene carbonate (PC or 4-methyl-1,3-dioxolan-2-one). The molar concentration of methoxypropylene carbonate (MetPC or 4-methoxymehyl-1,3-dioxolan-2-one) in an electrolytic solution was lower than that of PC. The viscosities of the electrolytic solutions in MetPC were considerably higher than those of the counterparts in PC. The ionic conductivity of the electrolytic solution was lower in MetPC. Nevertheless, the use of MetPC as an alternative single solvent led to the gravimetric capacitance comparable to that obtained for PC in the discharge of a measurement cell.

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Use of Fluoroethylene Carbonate as Solvent for Electric Double-Layer Capacitors

Cited by 16 publications

References 15 publications

Fluoroethylene Carbonate Addition Effect on Electrochemical Properties of Mixed Carbonate-based Organic Electrolyte Solution for a Capacitor

Fluoroethylene Carbonate Addition Effect on Electrochemical Properties of Mixed Carbonate-based Organic Electrolyte Solution for a Capacitor

Physical and Electrolytic Properties of Different Cyclic Carbonates as Solvents for Electric Double-Layer Capacitors

Effect of Methoxy Group on Physical and Electrolytic Properties of Propylene Carbonate

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