Prospects and Design Insights of Neat Ionic Liquids as Supercapacitor Electrolytes

Lethesh, Kallidanthiyil Chellappan; Bamgbopa, Musbaudeen O.; Susantyoko, Rahmat Agung

doi:10.3389/fenrg.2021.741772

Cited by 22 publications

(14 citation statements)

References 119 publications

(119 reference statements)

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“…The purification of ILs is energy extensive and can be quite complex, making it impractical for large-scale applications. Therefore, it is crucial to evaluate the electrochemical properties of commercial ILs to be used in large scale electrochemical applications like supercapacitor development (Lethesh et al, 2021).…”

Section: Esw E a − E Cmentioning

confidence: 99%

“…Ionic liquids (ILs) are being used to replace conventional organic solvents in various applications because of their unique features such as inherent ionic conductivity, high thermal stability, wide liquid state temperature range, and high electrochemical stability (Wasserscheid and Welton, 2008) (Paul et al, 2020) (Lethesh et al, 2021) (Kermanioryani et al, 2016) (Grøssereid et al, 2019). Recently, the application of ionic liquid (IL) based electrolytes in energy storage devices has been an active area of research (Chellappan et al, 2020) (Bahadori et al, 2020) (Doherty, 2018) (Ma et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Temperature-Dependent Electrochemical Stability Window of Bis(trifluoromethanesulfonyl)imide and Bis(fluorosulfonyl)imide Anion Based Ionic Liquids

Lethesh

Bahaa²,

Abdullah³

et al. 2022

Front. Chem.

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The electrochemical stability of 22 commercially available hydrophobic ionic liquids was measured at different temperatures (288.15, 298.15, 313.15, 333.15 and 358.15 K), to systematically investigate ionic liquids towards electrolytes for supercapacitors in harsh weather conditions. Bis(trifluoromethanesulfonyl)imide and bis(fluorosulfonyl)imide anions in combination with 1-Butyl-1-methylpyrrolidinium, 1-Ethyl-3-methylimidazolium, N-Ethyl-N, N-dimethyl-N(2methoxyethyl)ammonium, 1-Methyl-1-(2-methoxyethyl)pyrrolidinium, N-Pentyl-N-methylpyrrolidinium, N, N-Diethyl-N-methyl-N-propylammonium, N, N-Dimethyl-N-ethyl-N-benzyl ammonium, N, N-Dimethyl-N-Ethyl-N-phenylethylammonium, N-Butyl-N-methylpiperidinium, 1-Methyl-1-propylpiperidinium, N-Tributyl-N-methylammonium, N-Trimethyl-N-butylammonium, N-Trimethyl-N-butylammonium, N-Trimethyl-N-propylammonium, N-Propyl-N-methylpyrrolidinium cations were selected for the study. Linear regression with a numerical model was used in combination with voltammetry experiments to deduce the temperature sensitivity of both anodic and cathodic potential limits (defining the electrochemical stability window), in addition to extrapolating results to 283.15 and 363.15 K. We evaluated the influence of the cations, anions, and the presence of functional groups on the observed electrochemical stability window which ranged from 4.1 to 6.1 V.

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Section: Esw E a − E Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Electrochemical Stability Window of Bis(trifluoromethanesulfonyl)imide and Bis(fluorosulfonyl)imide Anion Based Ionic Liquids

Lethesh

Bahaa²,

Abdullah³

et al. 2022

Front. Chem.

Self Cite

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“…The employment of organic electrolytes can widen the operation voltage window up to 2.5–2.7 V, but their flammable nature may bring about the safe risk of supercapacitors. Alternatively, ionic liquids are an intriguing selection as the electrolyte for supercapacitors because of their nonflammability, higher decomposition voltage (3.5–4.0 V), and wide liquid range. , Besides, the ionic feature of ILs facilitates high ionic conductivity; therefore, IL electrolytes can substantially enhance the energy density of supercapacitors, which is a feasible way to narrow the gap between batteries and supercapacitors based on aqueous/organic electrolytes. For 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([Bmim][Tf 2 N]) ionic liquid, the −C 4 H 9 alkyl chain of Bmim + and the −CF 3 groups of Tf 2 N – are prototypical nonpolar moieties.…”

Section: Introductionmentioning

confidence: 99%

Thiosalicylic Acid Modified Graphene Aerogel as Efficient Electrode Material for Ionic Liquid Electrolyte-Based Supercapacitors

Chen

et al. 2022

J. Phys. Chem. C

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Balancing energy density and power density of supercapacitors is highly desired to extend their application range. The development of new electrode materials with efficient electron/ion migration channels and large surface area accessible by the ionic liquid (IL) electrolyte with high stable potential window is a critical way to construct the high-performances of supercapacitors. In this work, a thiosalicylic acid modified graphene aerogel (TGA) was prepared by hydrothermal treatment of a graphene oxide precursor using thiosalicylic acid (TSA) as reductant, sulfur-dopant, and modifier. As-prepared TGA material has hierarchically porous texture with wide pore size distribution range and large accessible surface area by IL electrolytes, which is beneficial to the rapid diffusion and adsorption of IL electrolyte ions with larger ion sizes and high viscosity. Therefore, the TGA material possesses high specific capacitance and rate capability. Using 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([Bmim][Tf 2 N]) IL electrolyte, the assembled symmetric TGA-based supercapacitor can deliver energy densities of 115−28 Wh kg −1 within power densities of 946−11586 W kg −1 . The current work provides a feasible avenue to accomplish the balance between energy density and power density of supercapacitors via the design and synthesis of hierarchically porous graphene aerogels containing doped-heteroatoms and matching with IL electrolyte.

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“…Supercapacitors have gained attention globally due to their high energy density and fast charge/discharge rate. Practically, there are several reports indicating that supercapacitors could replace the conventional battery for better performance and a longer lifespan. − Room-temperature ionic liquids (RTILs) potentially assist supercapacitors to attain high thermal stability and can lead to a conductive and high cyclability system. − In this superconcentrated system, the RTIL electrolyte exhibits a unique layer formation which differs from the typical ion layer formation in the solvated system assessing its dynamic properties on the surface . The usage of graphite, a well-known electrode material in the supercapacitor design has many strong points in its being in the energy storage design due to its inexpensiveness, high durability, and eco-friendliness. − …”

Section: Introductionmentioning

confidence: 99%

Highlight on H-Bond Interaction-Associated Multiple Ion Layer Formation of an Imidazolium-Based Ionic Liquid on a Potential-Bias Surface: Molecular Dynamics Simulations

et al. 2022

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Multiple ion layer formation associated with molecular orientation alteration and hydrogen bonding in a supercapacitor model with 1-ethyl-3-methylimidazolium bis-(trifluoromethylsulfonyl)imide ([C 2 mim][NtF 2 ]) as a roomtemperature ionic liquid (RTIL) electrolyte has been investigated using potential-bias classical molecular dynamics (CMD) simulations. A 50-ion pair model was used to observe the molecular ion layer formation of [C 2 mim][NtF 2 ] of the simulated electrified graphite electrode. After applying the potential bias, multiple layers of [C 2 mim] + and [NtF 2 ] − formed and became more pronounced.An orientation analysis indicated that the higher potential differences play a significant role in [C 2 mim] + , especially near the negative surface. The π−π stacking interaction between [C 2 mim] + rings and graphene electrodes was clearly perceived. Principal component analysis (PCA) was introduced to address the characteristics of the layer formation, respectively, to the potential bias applied to the simulated model. PCA scores from the applied potential (ΔE = 0.0, 1.0, 2.0, 3.0, and 4.0 V) were used to group the characteristics of the atom pairing associated with the number of H-bonds between H atoms in the [C 2 mim] + cation and all atoms in the [NtF 2 ] − anion.

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Prospects and Design Insights of Neat Ionic Liquids as Supercapacitor Electrolytes

Cited by 22 publications

References 119 publications

Temperature-Dependent Electrochemical Stability Window of Bis(trifluoromethanesulfonyl)imide and Bis(fluorosulfonyl)imide Anion Based Ionic Liquids

Temperature-Dependent Electrochemical Stability Window of Bis(trifluoromethanesulfonyl)imide and Bis(fluorosulfonyl)imide Anion Based Ionic Liquids

Thiosalicylic Acid Modified Graphene Aerogel as Efficient Electrode Material for Ionic Liquid Electrolyte-Based Supercapacitors

Highlight on H-Bond Interaction-Associated Multiple Ion Layer Formation of an Imidazolium-Based Ionic Liquid on a Potential-Bias Surface: Molecular Dynamics Simulations

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