Electrochemical Properties of Quaternary Ammonium Salts for Electrochemical Capacitors

Ue, Makoto; Takeda, Masayuki; Takehara, Masahiro; Mori, Shoichiro

doi:10.1149/1.1837882

Cited by 232 publications

(201 citation statements)

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“…Aqueous electrolytes exhibit good conductivities (a few hundred mS cm −1 for concentrated sulphuric acid solutions) but with a limited potential window (around 1 V). On the other hand, organic electrolytes have lower conductivity (around tens of mS cm −1 ) but lead to higher cell voltage (2.3-2.7 V) [18]. This explains why organic electrolytes are generally used in carbon-based supercapacitors: both the energy density (E = CV 2 /2 where C is the capacitance and V the cell voltage) and the power density are higher as compared to aqueous electrolyte.…”

Section: Galvanostatic Cycling Testsmentioning

confidence: 99%

Electrode surface treatment and electrochemical impedance spectroscopy study on carbon/carbon supercapacitors

2005

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID : 2600 ABSTRACT Power improvement in supercapacitors is mainly related to lowering the internal impedance. The real part of the impedance at a given frequency is called ESR (equivalent series resistance). Several contributions are included in the ESR: the electrolyte resistance (including the separator), the active material resistance (with both ionic and electronic parts) and the active material/current collector interface resistance. The first two contributions have been intensively described and studied by many authors. The first part of this paper is focused on the use of surface treatments as a way to decrease the active material/current collector impedance. Al current collector foils have been treated following a two-step procedure: electrochemical etching and sol-gel coating by a highly-covering, conducting carbonaceous material. It aims to increase the Al foil/active material surface contact leading to lower resistance. In a second part, carbon-carbon supercapacitor impedance is discussed in term of complex capacitance and complex power from electrochemical impedance spectroscopy data. This representation permits extraction of a relaxation time constant that provides important information on supercapacitor behaviour. The influence of carbon nanotubes addition on electrochemical performance of carbon/carbon supercapacitors has also been studied by electrochemical impedance spectroscopy.

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Section: Galvanostatic Cycling Testsmentioning

confidence: 99%

Electrode surface treatment and electrochemical impedance spectroscopy study on carbon/carbon supercapacitors

2005

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“…However, conventional EDLCs have low energy density. Hence, EDLCs have been actively investigated to obtain both high power and energy density [1][2][3]. This might be achieved by using carbon materials with a large surface area and adaptable nanopore widths and ions as electrodes.…”

Section: Introductionmentioning

confidence: 99%

Local Ordered Structure of Propylene Carbonate in Slit-Shaped Carbon Nanopores by GCMC Simulation

Ohba

Kaneko

Kanoh

2011

ISRN Nanotechnology

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An electric double-layer capacitor (EDLC) has high potential for storing electrical energy at a high power density. It was reported that a narrow nanopore system provides higher performance of EDLCs. In such a system, propylene carbonate (PC) is generally used as a solvent in EDLCs. Hence, the structure of PC in the slit-shaped carbon nanopores should be investigated to reveal the EDLC mechanism. In this paper, grand canonical Monte Carlo simulation of PC adsorbed in nanopores was performed to elucidate molecular-level understanding of the influence of PC on the EDLC performance. PC molecules have a highly ordered structure and longer intermolecular distances in nanopores of a pore width less than 0.7 nm. Thus, the highly ordered and low-density structure formation of the adsorbed PC molecules in narrow nanopores provides a permeation path for electrolytes through nanopores, indicating high-performance EDLCs.

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“…) at 25°C, 2,3 whereas that of TEMABF 4 is 2.22.3 M at 25°C. 2,3 The use of the smallest quaternary ammonium ion, tetramethylammonium ion (TMA + ), can increase the number of ions accumulated in pores of an activated carbon electrode and bring about high capacitance of the EDLC.…”

Section: ¹3mentioning

confidence: 89%

Electrolytic Properties of Tetramethylammonium Compound in Highly Concentrated Solutions and Its Application to Electric Double-Layer Capacitors

et al. 2013

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The use of tetramethylammonium ions (TMA + ) at moderately high concentrations of the electrolytes can increase the number of ions accumulated in pores of an activated carbon electrode and bring about high capacitance of an electric double-layer capacitor (EDLC). The solubility of tetramethylammonium difluoro(oxalato)borate (TMADFOB) in propylene carbonate (PC) was 2.0 M (M = mol dm −3 ) or more. The maximal ionic conductivity of a TMADFOB solution in PC was observed at about 1.6 M at 25°C. The increase in the concentration of the electrolyte resulted in the increase in the gravimetric capacitance. The gravimetric capacitance found for TMADFOB was slightly higher than that for triethylmethylammonium tetrafluoroborate (TEMABF 4 ).

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Electrochemical Properties of Quaternary Ammonium Salts for Electrochemical Capacitors

Cited by 232 publications

References 1 publication

Electrode surface treatment and electrochemical impedance spectroscopy study on carbon/carbon supercapacitors

Electrode surface treatment and electrochemical impedance spectroscopy study on carbon/carbon supercapacitors

Local Ordered Structure of Propylene Carbonate in Slit-Shaped Carbon Nanopores by GCMC Simulation

Electrolytic Properties of Tetramethylammonium Compound in Highly Concentrated Solutions and Its Application to Electric Double-Layer Capacitors

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