Sulfonium Bis(trifluorosulfonimide) Plastic Crystal Ionic Liquid as an Electrolyte at Elevated Temperature for High-Energy Supercapacitors

Anouti, Mérièm; Timperman, Laure; Hilali, M.; Boisset, Aurélien; Galiano, Hervé

doi:10.1021/jp3012987

Cited by 64 publications

(45 citation statements)

References 57 publications

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“…Regarding the sulfonium-based cations, Anouti et al 270 Comparative studies on ILs with different types of cations were also carried out. 272,273 Sillars et al 272 …”

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confidence: 99%

A review of electrolyte materials and compositions for electrochemical supercapacitors

et al. 2015

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Electrolytes have been identified as some of the most influential components in the performance of electrochemical supercapacitors (ESs), which include: electrical double-layer capacitors, pseudocapacitors and hybrid supercapacitors. This paper reviews recent progress in the research and development of ES electrolytes. The electrolytes are classified into several categories, including: aqueous, organic, ionic liquids, solid-state or quasi-solid-state, as well as redox-active electrolytes. Effects of electrolyte properties on ES performance are discussed in detail. The principles and methods of designing and optimizing electrolytes for ES performance and application are highlighted through a comprehensive analysis of the literature. Interaction among the electrolytes, electro-active materials and inactive components (current collectors, binders, and separators) is discussed. The challenges in producing high-performing electrolytes are analyzed. Several possible research directions to overcome these challenges are proposed for future efforts, with the main aim of improving ESs' energy density without sacrificing existing advantages (e.g., a high power density and a long cycle-life) (507 references).

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“…Regarding the sulfonium-based cations, Anouti et al 270 Comparative studies on ILs with different types of cations were also carried out. 272,273 Sillars et al 272 …”

Section: View Article Onlinementioning

confidence: 99%

A review of electrolyte materials and compositions for electrochemical supercapacitors

et al. 2015

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“…25−29 A simple example of this is trimethyl sulfonium [Tf 2 N] ([S 111 ][Tf 2 N]), which has been investigated for use as an EDLC electrolyte at elevated temperatures (50 and 80°C). 30 Despite possessing a melting temperature of 45.5°C…”

Section: ■ Introductionmentioning

confidence: 99%

Ionic Liquids Containing Sulfonium Cations as Electrolytes for Electrochemical Double Layer Capacitors

et al. 2015

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In this work, we report on the behavior of ionic liquids (ILs) containing sulfonium cations as electrolytes for electrochemical double layer capacitors (EDLCs). Physical properties such as viscosity and ionic conductivity are reported over a range of temperatures for ILs containing the diethylmethyl sulfonium [S 221 ], triethyl sulfonium [S 222 ], and diethylpropyl sulfonium [S 223 ] cations paired with the bis-(trifluoromethanesulfonyl) imide [Tf 2 N] anion. The size and structure of the cations are shown to influence the physical and electrochemical properties of the ILs, with a significant degree of ionic coordination being evident in [S 223 ][Tf 2 N]. The electrochemical behavior of these ILs in EDLCs was compared with that of a fairly e s t a b l i s h e d I L e l e c t r o l y t e , N -b u t y l -N -m e t h y l p y r r o l i d i n i u m b i s -(trifluoromethanesulfonyl) imide ([Pyr 14 ][Tf 2 N]), and it is shown that [S 221 ][Tf 2 N]can perform better in terms of energy and power at room temperature, despite operating at a much reduced potential.

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“…As a consequence, they have attracted much interest [2][3][4][5][6][7] in recent years, especially in the demanding energy sectors of dye-sensitized fuel cells, 6,8 batteries 9-11 and supercapacitors, [12][13][14] as well as in fundamental electrochemistry. Ionic liquids (ILs) 1 provide a range of options to diversify this interface as a result of their structural heterogeneity and synthetic exibility.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the dynamic electrochemical stability of ionic liquid–metal interfaces against reactive oxygen species using an in situ electrochemical quartz crystal microbalance

2015

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The dynamic interactions between the electrochemically generated superoxide radical (O 2 c À ) and three structurally different ionic liquids (ILs) were characterized using an electrochemical quartz crystal microbalance (EQCM). We established the long-term stability of the interface (on the scale of hours and weeks) against the most ubiquitous interferent in electrochemical energy devices and sensors: oxygen.Oxygen potentially limits the application of IL electrolytes in these devices. In particular, the electrochemical behavior of the O 2 /O 2 c À couple and the ion pair formed between the cation of an IL and O 2 c À were evaluated. O 2 c À tends to form ion pair complexes with the cation of an IL, subsequently abstracting a proton to form different products depending on the cationic structure of the IL used. The reversibility of the O 2 /O 2 c À electrode reaction depends on the subsequent chemical reactions between O 2 c À and the IL, which are more pronounced at slow scan rates. It was found that O 2 c À was significantly more stable in the IL with the [BMPY] cation than in ILs with imidazolium salts. The stability of the ILs towards O 2 c À attack follows the order [BMPY][NTf 2 ] > [BdMIM][NTf 2 ] > [BMIM][NTf 2 ] as evaluated on atime-scale of a few seconds to minutes and up to 3 weeks. It was found that the formation of the [Cation]/O 2 c À ion pair complex lowers the local viscosity of the IL near the electrode, reflected in the change in the oscillating frequency of the quartz crystal electrode. As much as is the feasibility for the formation of this ion pair, that much is the tendency of the IL to lose its electrochemical stability. A combined analysis can provide a quick indication of the dynamic stability of the electrode-electrolyte interface for any IL in the presence of certain electrochemical reactions using the EQCM technique.

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Sulfonium Bis(trifluorosulfonimide) Plastic Crystal Ionic Liquid as an Electrolyte at Elevated Temperature for High-Energy Supercapacitors

Cited by 64 publications

References 57 publications

A review of electrolyte materials and compositions for electrochemical supercapacitors

A review of electrolyte materials and compositions for electrochemical supercapacitors

Ionic Liquids Containing Sulfonium Cations as Electrolytes for Electrochemical Double Layer Capacitors

Evaluation of the dynamic electrochemical stability of ionic liquid–metal interfaces against reactive oxygen species using an in situ electrochemical quartz crystal microbalance

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