Mixtures of acetonitrile and ethyl isopropyl sulfone as electrolytes for electrochemical double layer capacitors

Schütter, Christoph; Bothe, Annika; Balducci, Andrea

doi:10.1016/j.electacta.2019.135421

Cited by 27 publications

(16 citation statements)

References 19 publications

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“…The basis for this assertion is the known monotonic dependence of RTIL-solvent system viscosity on solvent concentration. 37–40 In a homogeneous system, ion mobility is inversely proportional to viscosity, leading to the prediction that ρ f should diminish in proportion to the reduction in viscosity, a prediction that is at odds with the functional form of the ρ f data in Fig. 2–4.…”

Section: Resultsmentioning

confidence: 99%

“…As noted above, the dependence of bulk viscosity on RTIL/solvent binary system composition has been reported and varies smoothly with extent of dilution. 37–40,43–46 It is important to consider that the measurement of bulk viscosity represents an average of intermolecular interaction energies over poorly-defined macroscopic length scales. Specifically, the viscosity is a measure of the frictional interactions between the species that are present in the liquid and, while it is typically taken as representing intermolecular interactions in liquids, this assumption is not necessarily correct in complex multi-component systems.…”

Section: Resultsmentioning

confidence: 99%

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The effect of dilution on induced free charge density gradients in room temperature ionic liquids

Hossain

Blanchard

2022

Phys. Chem. Chem. Phys.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The effect of dilution on induced free charge density gradients in room temperature ionic liquids

Hossain

Blanchard

2022

Phys. Chem. Chem. Phys.

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“…[ 11 ] Schütter et al. demonstrated the high electrochemical stability of this alternative solvent and were able to show that its use in EDLCs allows the realization of devices with an operating voltage of 3.4 V. [ 12 ] These properties make EiPS an interesting electrolyte solvent for application in high‐voltage EDLCs. Nevertheless, further investigation is needed to understand the electrochemical performance of EDLCs based on EiPS at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Improving the Stability of Supercapacitors at High Voltages and High Temperatures by the Implementation of Ethyl Isopropyl Sulfone as Electrolyte Solvent

Köps

Kreth

Leistenschneider

et al. 2022

Advanced Energy Materials

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promising technologies. [1] EDLCs display high power densities and extremely high lifetime which makes them the technology of choice for a variety of applications requiring a fast and continuous delivery of energy. However, as the energy density of these devices is rather limited (5-8 Wh kg −1 ), their use is currently limited to applications that require a relatively low amount of energy. [2] As indicated by several studies, an increase in energy density would lead to a drastic increase in the number of possible applications for EDLCs. [3] Furthermore, it would enable the use of these devices as replacement for established battery systems in fields where high power is required. [4] This latter application is particularly interesting because nowadays the use of batteries in high-power applications is typically leading to increased cell degradation and, consequently, to increased cost due to early system failure. For this reason, in the available electric vehicles, EDLCs are often applied as a support to reduce the load on the main battery system during rapid acceleration and power uptake by regenerative braking. It has been shown that this hybrid energy storage solution results in improved performance while extending the lifetime of the battery system. [5] Nonetheless, further improvements are urgently needed to extend the battery life even more.For these reasons, current research focuses on the development of EDLCs with improved energy density. To reach this goal, the electrode capacitance needs to be maximized and, at the same time, the operating voltage of these systems needs to be significantly increased. While commercially available devices are limited to operating voltages of up to 3.0 V, an increase to 3.2 V or more would increase the energy density significantly. The operating voltage of EDLCs is mainly determined by the onset of electrolyte decomposition at the electrode surface. [6] The state-of-the-art electrolytes consist of solutions containing ammonium-based conducting salt, e.g. tetraethylammonium tetrafluoroborate (TEABF 4 ), dissolved in acetonitrile (ACN). [7] These electrolytes display high conductivity but guarantee high stability only if used in devices with a maximum voltage of 3 V. [8] With the aim to overcome this limitation and realize high-voltage EDLCs, a variety of novel solvents, salts, and ionic liquids have been investigated in the last years. [9] Although Two of the main weaknesses of modern electric double-layer capacitors are the rather limited ranges of operating voltage and temperature in which these devices do not suffer from the occurrence of irreversible decomposition processes. These parameters are strongly interconnected and lowering the operating voltage when increasing the temperature is unavoidable, so as to protect the electric double-layer capacitor from damage. With the aim to maintain the operating voltage as high as possible at elevated temperatures, in this study, the application of ethyl isopropyl sulfone as an electrolyte solvent for electric double-layer ...

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Section: Resultsmentioning

confidence: 99%

“…Simultaneous thermal analysis is a widespread technique, which is routinely used for the investigation of materials and electrolytes of interest for energy storage devices, including EDLCs. [31][32][33][34] To date, nevertheless, the realization of an electrochemical in situ cell which can be coupled with this kind of equipment has not been considered. To successfully implement an electrochemical in situ cell into a STA a certain number of requirements need to be satisfied: 1) The heat must be transferred fast and evenly between the cell and the probe; 2) The in situ cell must be lightweight, to be usable in conventional TGA/DTA devices; 3) The parasitic heat transfer, contact resistance, and total mass of cables tension of the wires must be minimized; and 4) The cell needs to endure heat as well as an aggressive chemical environment.…”

Section: Resultsmentioning

confidence: 99%

Design and Use of a Novel In Situ Simultaneous Thermal Analysis Cell for an Accurate “Real Time” Monitoring of the Heat and Weight Changes Occurring in Electrochemical Capacitors

2021

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Herein, the design and use of a novel in situ simultaneous thermal analysis (STA) cell is reported the first time, which allows a precise monitoring of the variation of heat flow, mass loss, resistance, and capacitance occurring in electrical double layer capacitors (EDLCs) operating in conditions comparable to real applications. Utilizing this in situ STA cell, the impact of the operating voltage on the stability of EDLCs during float tests is investigated, and it is shown that the first hours of these tests are the most critical for the stability of the devices. The novel in situ STA cell proposed here can be utilized for the investigation of any kind of electrochemical system, and it can be considered a novel and powerful tool for the investigation of the heating and mass variations occurring in these systems.

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Mixtures of acetonitrile and ethyl isopropyl sulfone as electrolytes for electrochemical double layer capacitors

Cited by 27 publications

References 19 publications

The effect of dilution on induced free charge density gradients in room temperature ionic liquids

The effect of dilution on induced free charge density gradients in room temperature ionic liquids

Improving the Stability of Supercapacitors at High Voltages and High Temperatures by the Implementation of Ethyl Isopropyl Sulfone as Electrolyte Solvent

Design and Use of a Novel In Situ Simultaneous Thermal Analysis Cell for an Accurate “Real Time” Monitoring of the Heat and Weight Changes Occurring in Electrochemical Capacitors

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