High-voltage ionic liquid electrolytes based on ether functionalized pyrrolidinium for electric double-layer capacitors

Lee, Jun Young; Ryu, Jung Bok; Lee, Albert S.; Na, Wonjun; Yoon, Hyo Sang; Kim, Wan Joo; Koo, Chong Min

doi:10.1016/j.electacta.2016.11.176

Cited by 34 publications

(9 citation statements)

References 29 publications

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“…48 While melting point (T m ) for γ-IL was observed to be -7.6 °C, but was not observed for β-IL at the same temperature. 48 Other studies where slight variation in methylene spencer unit in ether functionalised ILs led to significant changes in electrochemistry, 14,53,54 density, 55 viscosity, 53 and T d, 29,55 have also been published.…”

Section: Ionic Liquidsmentioning

confidence: 99%

Probing the electronic structure of ether functionalised ionic liquids using X-ray photoelectron spectroscopy

Dick

Fouda

Besley

et al. 2020

Phys. Chem. Chem. Phys.

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Section: Ionic Liquidsmentioning

confidence: 99%

Probing the electronic structure of ether functionalised ionic liquids using X-ray photoelectron spectroscopy

Dick

Fouda

Besley

et al. 2020

Phys. Chem. Chem. Phys.

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“…high operating voltage). 26,[34][35][36][37][38][39][40][41][42][43][44] However, higher cell potential can initiate the start of the faradaic processes at the supercapacitor electrodes, leading to the degradation of the materials or even to the burst of the cell body. 1,13,[45][46][47][48][49][50][51][52][53][54][55][56] One of the most electrochemically stable RTILs is 1-ethyl-3-methylimidazolium tetracyanoborate (EMImB(CN) 4 ) having a relatively good conductivity.…”

mentioning

confidence: 99%

The Electrochemical Behavior of 1-Ethyl-3-Methyl Imidazolium Tetracyanoborate Visualized by In Situ X-ray Photoelectron Spectroscopy at the Negatively and Positively Polarized Micro-Mesoporous Carbon Electrode

Kruusma

Tõnisoo

Pärna

et al. 2017

J. Electrochem. Soc.

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The electrochemical properties of the C(Mo 2 C) | EMImB(CN) 4 system have been analyzed using cyclic voltammetry, in situ X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy techniques. The cyclic voltammetry and electrochemical impedance measurements indicated that the tetracyanoborate anions started to electrooxidize and electropolymerize at E = 2.12 V (vs. Ag/AgCl in EMImBF 4 ). However, despite of the formation of compact dielectric polymer layer at the micro-mesoporous C(Mo 2 C) electrode surface very slow electrochemical polymerization of tetracyanoborate anions continued further at E > 2.12 V leading to the blocking of the C(Mo 2 C) electrode porous structure and to the reduction of the electrochemically active surface area necessary for the construction of the high energy density supercapacitors. Thus, the tetracyanoborate anion based ionic liquids can be used as the electrolytes for the initial formation of the passivating solid-electrolyte interface for the very wide cell potential supercapacitor positive electrodes, as an electrolyte additives for the solid-electrolyte interface formation or for the correction of the solid-electrolyte interface damages. Room temperature ionic liquids (RTILs) are remarkable electrolytes (salts) being in a liquid form at or near the room temperature. This means that it is possible to construct the electrical energy storage systems without the need for the solvent characterized usually with high vapor pressure. [1][2][3][4][5][6][7][8][9] The application of the RTILs is also very welcome in the energy technology due to their good electrical conductivity and high electrochemical stability, 10-13 low volatility [14][15][16][17] and relatively high thermal stability. [18][19][20] One class of the electrical energy storing systems, where RTILs can be used, is the electrical double layer capacitors (EDLCs). 10,[21][22][23][24][25][26][27] The EDLCs with very high power and the energy densities are also called as supercapacitors. [28][29][30] Some RTILs and the electrode materials have been investigated and described so far 12,13,22,[24][25][26][27][28][29][30][31][32][33] and the studies of the possible candidates for the supercapacitor materials and the development process of higher power and the energy density systems is still intensive. One way to increase the EDLCs energy density stored is to apply higher cell potentials while the amount of charge stored in a capacitor is proportional to the square of the applied cell potential. [28][29][30]34 Therefore it is of a great interest to study RTILs as possible electrolytes for supercapacitors at high cell potential (i.e. high operating voltage).26,34-44 However, higher cell potential can initiate the start of the faradaic processes at the supercapacitor electrodes, leading to the degradation of the materials or even to the burst of the cell body. 1,13,[45][46][47][48][49][50][51][52][53][54][55][56] One of the most electrochemically stable RTILs is 1-ethyl-3-methylimidazolium tetracyanoborate (EMImB(CN)...

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“…From Table 3 and Figure 11a,c, it is clear that ether bond based ILs (EtO(CH 2 ) 2 MMIM-Tf 2 N and P 222(201) -Tf 2 N) show superior performance. 127 In another study, also PMIM-FSI, PYR 13 -FSI, and bis(fluorosulfonyl)imide (MeOMPYR-FSI) were analyzed where MeOMPYR-FSI shows 56 F g −1 C sp with a maximum 3.5 V operating voltage and stable cyclic performance where PMIM-FSI decomposes beyond 3.0 V. 128 Siyahjani et al compared GPE containing IL, MMEt-TFSI, AMEt-TFSI, AEI-TFSI, AMI-TFSI, and AL3IL-TFSI. They show a C sp of AMEt-TFSI (250 F g −1 ) > MMEt-TFSI (160 F g −1 ) and AL3IL (238 F g −1 ) maximum among the rest of the others.…”

Section: Ionic Liquids As Electrolytes In Supercapacitorsmentioning

confidence: 99%

A Comprehensive Review of Novel Emerging Electrolytes for Supercapacitors: Aqueous and Organic Electrolytes Versus Ionic Liquid-Based Electrolytes

Saha,

Kumar,

Kanaoujiya

et al. 2024

Energy Fuels

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Storage of energy is essential to meet the daily demand for powering portable devices. This necessitates the development of storage systems such as supercapacitors (SCs), batteries, and solar cells. SCs have garnered a lot of attention for their ability to provide a massive amount of power. Nevertheless, traditional mechanisms fall short of our expectations. Ionic liquids (ILs), the evolutionary green designer solvents, are efficient enough to substitute for conventional electrolytes such as aqueous or organic electrolytes in SCs. A limited potential window of aqueous electrolytes restricts the performance of high energy electrodes. In contrast, organic electrolytes with high volatility, flammability, and lack of tunability are not suitable for long-term and robust applications. Beneficial properties of ILs such as negligible volatility, high thermal, chemical, and electrochemical stability have overcome many restrictions in SCs and improved their overall performances. ILs can be used as standalone electrolyte or can be mixed with organic electrolytes, redox elements, and polymers to obtain electrolytes for SCs. The structure of anions and cations has been found to significantly influence overall electrochemical performances. ILs benefit SCs with a wider working voltage, temperature range, and better energy density. ILs have been utilized not only as electrolytes but also in the synthesis of electrode materials. Consequently, it is essential to discuss recent findings and the function of ILs in achieving higher-performing SCs. This review mainly highlights the most recent findings on the use of ILs-based electrolytes and electrodes in supercapacitors.

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High-voltage ionic liquid electrolytes based on ether functionalized pyrrolidinium for electric double-layer capacitors

Cited by 34 publications

References 29 publications

Probing the electronic structure of ether functionalised ionic liquids using X-ray photoelectron spectroscopy

Probing the electronic structure of ether functionalised ionic liquids using X-ray photoelectron spectroscopy

The Electrochemical Behavior of 1-Ethyl-3-Methyl Imidazolium Tetracyanoborate Visualized by In Situ X-ray Photoelectron Spectroscopy at the Negatively and Positively Polarized Micro-Mesoporous Carbon Electrode

A Comprehensive Review of Novel Emerging Electrolytes for Supercapacitors: Aqueous and Organic Electrolytes Versus Ionic Liquid-Based Electrolytes

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