Influence of the solvent properties on the characteristics of a double layer capacitor

Arulepp, Mati; Permann, L.; Leis, Jaan; Perkson, Anti; Rumma, K.; Jänes, Alar; Lust, Enn

doi:10.1016/j.jpowsour.2004.03.026

Cited by 236 publications

(195 citation statements)

References 12 publications

Supporting

Mentioning

192

Contrasting

Order By: Relevance

“…[14] The majority of such studies focused on acetonitrile (AN) and propylene carbonate (PC) used in commercial electrochemical capacitors. While AN offers higher ionic conductivity and is more polar, it exhibits a nearly 45 % lower dielectric constant than PC.…”

Section: àmentioning

confidence: 99%

Small‐Angle Neutron Scattering for In Situ Probing of Ion Adsorption Inside Micropores

Boukhalfa

Melnichenko

et al. 2013

Angewandte Chemie

View full text Add to dashboard Cite

Transport and adsorption processes of electrolyte ions in porous carbon materials under an applied potential control the performance of double layer capacitors for rapidly emerging high-power energy storage applications, [1] capacitive deionization devices for water purification and desalination, [2] rotational motors for artificial muscles, microfluidic devices, and nanorobotics. [3] Electrochemical analysis techniques combined with structural and chemical characterization of porous carbon materials offer limited prognostic abilities. Several studies revealed significant impact of structural defects in carbon materials on their electrosorption properties [4] and the enhanced ion adsorption in sub-nanometer pores [5] in selected materials systems. The observed phenomena, however, were not always confirmed in other carbon materials or electrolytes, and the universality of such observations remains a topic of debates in the scientific community. The challenge comes from the difficulty of independently tuning various material properties needed for systematic experimental studies and from the high complexity of realistic materials systems for ab initio simulations.To gain better insights into adsorption phenomena, computer simulations were performed in model systems, [1a, 6] with a stronger emphasis on ionic liquid (IL) electrolytes, [1a, 6c-e] which do not contain solvent molecules and thus simplify the calculations. A recent study emphasized the importance of taking into consideration a more realistic structure of porous carbon materials. [7] While the obtained modeling results are insightful, development and adoption of complementary experimental techniques is critically needed to directly identify both the ion transport [8] and adsorption sites in a broad range of microporous solids as a function of the applied potential, verifying the molecular mechanisms previously proposed and providing guidance to future modeling efforts.Recent studies have demonstrated that small-angle neutron scattering (SANS) can provide unique, pore-size-specific information on the adsorption of confined fluids and may be used to evaluate the density of the adsorbed molecules in nanometer and sub-nanometer pores.

show abstract

Section: àmentioning

confidence: 99%

Small‐Angle Neutron Scattering for In Situ Probing of Ion Adsorption Inside Micropores

Boukhalfa

Melnichenko

et al. 2013

Angewandte Chemie

View full text Add to dashboard Cite

show abstract

“…Given the growing environmental constraints, studies (essentially in Japan) have been performed in order to replace ACN as electrolyte solvent and/or to improve PC-based supercapacitor performance, taking into account that many optimizations have already been done, such as ''spiro'' salts or TEMABF 4 . As a result, no suitable alternative to ACN has been found, especially in terms of conductivity [169] and the thermal stability and electrochemical stability combination [250,251]. It is important to note that mixtures of ACN have been tested and this can be interesting in terms of conductivity.…”

Section: Liquid-state Electrolyte and Remaining Problemsmentioning

confidence: 99%

Manufacturing of Industrial Supercapacitors

Azaïs¹

2013

Supercapacitors

View full text Add to dashboard Cite

“…The maximal energy density E max (in watt-hours per kilogram) and power density P max (in kilowatts per kilogram) values [25][26][27][28][29] were calculated using relations 5 and 6:…”

Section: Time Constants and Energy/power Density Calculationsmentioning

confidence: 99%

Comparison of carbon aerogel and carbide-derived carbon as electrode materials for non-aqueous supercapacitors with high performance

Laheäär

Peikolainen

Koel

et al. 2012

J Solid State Electrochem

View full text Add to dashboard Cite

Two porous carbon materials, one synthesised by pyrolysis of an organic aerogel prepared using solgel method and the other synthesised from molybdenum carbide by high temperature chlorination method, were tested as supercapacitor electrode materials in a nonaqueous tetraalkylammonium salt-based electrolyte. The gravimetric capacitance values calculated for the carbon aerogel (CAG)-based system were almost two times smaller (~55 Fg −1 ) compared to carbide-derived carbon (C(Mo 2 C))-based system (~125 Fg −1 ). However, due to the very wide region of ideal polarizability, 3.6 V for C(Mo 2 C) and 3.8 V for CAG-based test cells, very high energy densities up to 63 Wh kg −1 (34 Wh dm −3 ) and power densities up to 757 kW kg −1 (314 kW dm −3 ) were estimated for these systems, respectively. CAGbased system shows very short characteristic charge/ discharge time constant values (0.05 s).

show abstract

Influence of the solvent properties on the characteristics of a double layer capacitor

Cited by 236 publications

References 12 publications

Small‐Angle Neutron Scattering for In Situ Probing of Ion Adsorption Inside Micropores

Small‐Angle Neutron Scattering for In Situ Probing of Ion Adsorption Inside Micropores

Manufacturing of Industrial Supercapacitors

Comparison of carbon aerogel and carbide-derived carbon as electrode materials for non-aqueous supercapacitors with high performance

Contact Info

Product

Resources

About