Mixtures of Azepanium Based Ionic Liquids and Propylene Carbonate as High Voltage Electrolytes for Supercapacitors

Pohlmann, Sebastian; Olyschläger, T.; Goodrich, Peter; Vicente, J. Alvarez; Jacquemin, Johan; Balducci, Andrea

doi:10.1016/j.electacta.2014.11.189

Cited by 55 publications

(45 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Small semicircles observed on the impedance spectra at the higher frequency regions can be associated with cavity shape size of the carbon structures [49] or ion diffusion limitations [50,51]. In the case of ILs tested in EDLC application, the explanations of depressed semicircles on EIS spectra are based on relatively high viscosity of these electrolytes [52][53][54][55][56][57]. The values of specific capacitance and the values of EDR for all composite electrode based-systems determined from EIS method are summarized in Table 4.…”

Section: Resultsmentioning

confidence: 99%

Electrodes and hydrogel electrolytes based on cellulose: fabrication and characterization as EDLC components

Kasprzak

Stępniak

Galiński

2018

J Solid State Electrochem

View full text Add to dashboard Cite

In the present work, the cellulose-based materials were manufactured and used as components of electrochemical double layer capacitors (EDLCs). The preparation method of cellulose membranes as well as composite electrodes containing cellulose as a binder was presented. These materials were prepared using for the first time ionic liquid/dimethyl sulfoxide (IL/DMSO) mixture solvent. Obtained components displayed a uniform structure, thermal stability, and good electrochemical properties. The electrochemical performances of these materials were studied in 2-electrode EDLC cells by common electrochemical techniques as cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). The composite electrodes were investigated in three types of electrolytes: aqueous, organic, and ionic liquids. The cellulose membranes were, however, soaked in an aqueous electrolyte and tested as hydrogel polymer electrolytes. All investigated materials show high efficiency in terms of specific capacity. The studied cellulose-based capacitors exhibited specific capacitance values in the range of 20-22 F g −1 , depending on the type of applied electrolyte.

show abstract

Section: Resultsmentioning

confidence: 99%

Electrodes and hydrogel electrolytes based on cellulose: fabrication and characterization as EDLC components

Kasprzak

Stępniak

Galiński

2018

J Solid State Electrochem

View full text Add to dashboard Cite

show abstract

“…Na-ion, Mg-ion and metal-air batteries) for the development of potentially safer devices. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Furthermore, the high (electro)chemical stabilities and non-volatilities exhibited by many IL structures provides interesting electrolyte media for electrochemical gas sensors (e.g. for O 2 , [16][17][18][19] CO 2 ,20,21 NO 2 22 ) where traditional solvents are prone to evaporation leading to device failure, and also for electromechanical actuator, [23][24][25] and electrodeposition applications.…”

mentioning

confidence: 99%

“…The mutual solubility between many ILs and common nonaqueous electrochemical solvents enable the consideration of a wide range of formulations in a given mixture with the prospect of balancing the desired properties. As such, investigating the application of IL/molecular solvent blends as electrolytes for Li-ion batteries, [1][2][3][4] Naion batteries, 13 Li-O 2 chemistry, [32][33][34] and EDLCs, [7][8][9][10] has continually revealed material benefits relating to electrolyte stability and device safety.…”

mentioning

confidence: 99%

Physical and Electrochemical Investigations into Blended Electrolytes Containing a Glyme Solvent and Two Bis{(trifluoromethyl)sulfonyl}imide-Based Ionic Liquids

Neale

Goodrich

Hughes

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

In this paper, we report on thermophysical and electrochemical investigations of a series of molecular solvent/ionic liquid (IL) binary mixture electrolytes. Tetraethylene glycol dimethyl ether (TEGDME) is utilized as the molecular solvent component in separate mixtures with two bis{(trifluoromethyl)sulfonyl}imide anion based ILs paired with similarly sized cyclic and acyclic alkylammonium cations; 1-butyl-1-methylpyrrolidinium bis{(trifluoromethyl)sulfonyl}imide, [Pyrr 14 ] [TFSI], or N-butyl-N,N-dimethyl-N-ethylammonium bis{(trifluoromethyl)sulfonyl}imide, [N 1124 ] [TFSI]. The blending of ILs with select molecular solvents is an important strategy for the improvement of the typically sluggish transport capabilities of these interesting electrolytic solvents. Bulk volumetric and transport properties are reported as a function of temperature and binary mixture formulation; demonstrating the capacity for enhancing desired properties of the IL. Micro-disk electrode voltammetry and chronoamperometry in O 2 -saturated binary mixture electrolytes was used to assess the effect of formulation on the solubility and diffusivity of the dissolved gas. In addition, further investigations of the behavior of the O 2 redox couple at a GC macro-disk electrode are discussed. The exploration of ionic liquids (ILs) as alternatives to conventional molecular solvents in electrolyte formulations is continually growing for a variety of electrochemical applications. These low melting organic salts can be tailored to exhibit a variety of properties, including hydrophobicity and thermal, chemical, and electrochemical stability, which make them attractive candidate electrolyte solvents. Composed solely of ionic components, ILs consequently possess intrinsic electrolytic conductivity and are additionally non-volatile. These properties have encouraged the use of ILs as (complete or partial) substitutions of the volatile components of commercial Li-ion batteries, electrochemical double layer capacitors (EDLCs), and other prospective battery technologies (e.g. Na-ion, Mg-ion and metal-air batteries) for the development of potentially safer devices.1-15 Furthermore, the high (electro)chemical stabilities and non-volatilities exhibited by many IL structures provides interesting electrolyte media for electrochemical gas sensors (e.g. for O 2 , 16-19 CO 2 , 20,21 NO 2 22 ) where traditional solvents are prone to evaporation leading to device failure, and also for electromechanical actuator, 23-25 and electrodeposition applications. [26][27][28] Nevertheless, while the properties of ILs are dependent on the virtually unlimited combinations of different cation and anion structures, the attractive features are generally coupled with sluggish transport properties relative to conventional electrolytes based on either aqueous or organic solvents. In turn, electrochemical devices constructed with neat IL electrolytes are likely to suffer transport limitations on useable current rates for the given application, for example restricting power capabiliti...

show abstract

“…However, these two quantities vary in opposite ways in concentrated electrolytes, 63 so that the optimum will necessarily be a trade-off between these quantities. [64][65] Other limitations such as the operating temperature or the long-term stability may also be taken into account. It is worth noting that several ionic liquids may be combined, 66 which increases further the number of potential electrolytes.…”

Section: Discussionmentioning

confidence: 99%

“…A more promising technique for studying internal confinement of RTILs is by using accurately developed CDC electrode models which faithfully incorporate the complexities of the structure. CDCs with very narrow PSD 65 are characterised by properties close to those of metals, particularly electrical conductivity.…”

Section: Capacitance Enhancement Of [Emim] + [Tfsi]mentioning

confidence: 99%

Molecular modelling of carbon/ionic liquid interfaces for electric double – layer capacitors

Burt¹

View full text Add to dashboard Cite

Electric double-layer capacitors (EDLCs) are important energy storage devices that have high potential for use in existing and emerging markets such as electric vehicles, portable electronic devices, and smart grid management. This is due to their high power density and long lifetime, which are a result of their simple ion adsorption mechanism for charge storage. A significant and ongoing effort is being made to improve the energy density of ELDCs, so that they financially compete with batteries. EDLC improvement has mainly been facilitated through the investigation and discovery of novel solid and liquid materials.This topic was studied with the motivation of investigating charge storage mechanisms in EDLCs with configurations where traditional models are not appropriate to describe the phenomena observed in the literature. Significantly, in small pores anomalous results challenged the traditional beliefs of the electric double layer (EDL) and the accessibility of ions to sub-nanometre micropores.Highly dense RTIL electrolyte, which are non-dilute, and can also be solvent free, also can't be described by traditional models and display complex phenomena such as charge over-screening.This thesis evaluates molecular and charge storage mechanisms at solid-liquid interfaces of room temperature ionic-liquid (RTIL) electrolytes and porous carbon electrodes. Changes in charge storage mechanisms with the addition of an aprotic solvent, acetonitrile (ACN,) to the RTIL, was also investigated in simple slit-pores, and complex carbon electrode structures. The contact angle of RTIL drops was also investigated under a variety of conditions. The methodology of molecular dynamics (MD) simulation was chosen for this thesis as it offers unique benefits to approach the problem of understanding molecular phenomena in ELDCs. MD simulation was selected as it is possible to systematically control variables of interest to a high level of accuracy. In this way, theoretical structures, or models derived from real materials, can be analysed. Significantly, analysis of charge storage mechanisms occurring within small pores, or with dense electrolytes, can be completed with relative ease, unlike with experiments which require difficult or expensive in situ experimental techniques.The analysis began with studying simple slit-pore electrodes to provide a framework for comparison with more complex electrode materials. The charge storage mechanism was tested under a variety of conditions. Most interestingly, capacitance was found to have a moderate dependence on the amount of ACN in the electrolyte, which contrasts with previously noted behaviour at flat walls. Additionally, solid-like behaviour was observed for the bulk electrolyte in certain systems.iii We present the first results for a MD simulation of the RTIL EMIMBF 4 in model CDC electrodes at a potential of 1 V, with systematic addition of ACN to the electrolyte. Our simulations showed that the mechanism of charge storage is different between the positive and negative electrode,...

show abstract

Mixtures of Azepanium Based Ionic Liquids and Propylene Carbonate as High Voltage Electrolytes for Supercapacitors

Cited by 55 publications

References 31 publications

Electrodes and hydrogel electrolytes based on cellulose: fabrication and characterization as EDLC components

Electrodes and hydrogel electrolytes based on cellulose: fabrication and characterization as EDLC components

Physical and Electrochemical Investigations into Blended Electrolytes Containing a Glyme Solvent and Two Bis{(trifluoromethyl)sulfonyl}imide-Based Ionic Liquids

Molecular modelling of carbon/ionic liquid interfaces for electric double – layer capacitors

Contact Info

Product

Resources

About