Recognition of Ionic Liquids as High-Voltage Electrolytes for Supercapacitors

Pan, Shanshan; Yao, Meng; Zhang, Jiahe; Li, Bosen; Xing, Chunxian; Song, Xiaoguo; Su, Peng; Zhang, Haitao

doi:10.3389/fchem.2020.00261

Cited by 83 publications

(80 citation statements)

References 108 publications

(112 reference statements)

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“…This was mainly for the large capacitance drop at low temperatures and for electrolyte oxidation beyond 2.5 V at high temperatures, which was one of the major challenges for commercial SCs. However, the mixture of N -methyl- N -propylpiperidinium bis(fluorosulfonyl)imide (PIP 13 FSI) and N -butyl- N -methylpyrrolidinium bis(fluorosulfonyl)imide (PYR 14 FSI) in conjugation with (PIP 13 FSI) 0.5 (PYR 14 FSI) 0.5 enhances the wide temperature window of 150 °C [ 73 , 130 ].…”

Section: Ionic Liquids (Ils) For Supercapacitors (Scs)mentioning

confidence: 99%

Application of Ionic Liquids for Batteries and Supercapacitors

Ray

Saruhan

2021

Materials

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Nowadays, the rapid development and demand of high-performance, lightweight, low cost, portable/wearable electronic devices in electrical vehicles, aerospace, medical systems, etc., strongly motivates researchers towards advanced electrochemical energy storage (EES) devices and technologies. The electrolyte is also one of the most significant components of EES devices, such as batteries and supercapacitors. In addition to rapid ion transport and the stable electrochemical performance of electrolytes, great efforts are required to overcome safety issues due to flammability, leakage and thermal instability. A lot of research has already been completed on solid polymer electrolytes, but they are still lagging for practical application. Over the past few decades, ionic liquids (ILs) as electrolytes have been of considerable interest in Li-ion batteries and supercapacitor applications and could be an important way to make breakthroughs for the next-generation EES systems. The high ionic conductivity, low melting point (lower than 100 °C), wide electrochemical potential window (up to 5–6 V vs. Li+/Li), good thermal stability, non-flammability, low volatility due to cation–anion combinations and the promising self-healing ability of ILs make them superior as “green” solvents for industrial EES applications. In this short review, we try to provide an overview of the recent research on ILs electrolytes, their advantages and challenges for next-generation Li-ion battery and supercapacitor applications.

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Section: Ionic Liquids (Ils) For Supercapacitors (Scs)mentioning

confidence: 99%

Application of Ionic Liquids for Batteries and Supercapacitors

Ray

Saruhan

2021

Materials

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“…Supercapacitors, regarded as a type of energy storage devices in the future, have been studied intensively owing to their merits: rapid power output, ultralong cyclability, and wide operating temperature range, which can be utilized in various fields, for example, the electric buses, wearable electronics and power grid that integrating renewable energy [31–34] . Typically, supercapacitors are divided into three categories (Figure 3a) according to the energy storage mechanisms: electric double‐layer capacitors (EDLCs), pseudocapacitors, and hybrid supercapacitors [35] . However, the large‐scale applications of supercapacitors are hindered seriously by their relatively low energy density.…”

Section: Ionic Liquids‐based Electrolytes For Supercapacitorsmentioning

confidence: 99%

“…Currently, employing high voltage electrolytes is regarded as an effective strategy to enhance the energy density of supercapacitors. Ionic liquids (ILs) possess numerous advantages, including high ionic conductivity, prominent electrochemical stability, and low flammability, [35] which would be ideal for high voltage electrolytes utilized in supercapacitors, and thus have attracted considerable interests.…”

Section: Ionic Liquids‐based Electrolytes For Supercapacitorsmentioning

confidence: 99%

“…Generally, gel polymer can own the advantages of ionic liquids and polymer electrolytes. Hence, ionogel electrolyte will be able to have the characteristics of wide voltage window, higher conductivity, great stability and high and low temperature performance [35,39,40,42,43] . Employment of ionogel electrolytes can achieve a huge breakthrough in energy density of supercapacitors.…”

Section: Ionic Liquids‐based Electrolytes For Supercapacitorsmentioning

confidence: 99%

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Roadmap on Ionic Liquid Electrolytes for Energy Storage Devices

Yang

et al. 2021

Chemistry An Asian Journal

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Ionic liquids are considered to be promising electrolyte solvents or additives for rechargeable batteries (i. e., lithium‐ion batteries, sodium‐ion batteries, lithium‐sulfur batteries, aluminum‐ion batteries, etc.) and supercapacitors. This is related with the superior physical and electrochemical properties of ionic liquids, which can influence the performance of rechargeable batteries. Therefore, it is necessary to write a roadmap on ionic liquids for rechargeable batteries. In this roadmap, some progress, critical techniques, opportunities and challenges of ionic liquid electrolytes for various batteries and supercapacitors are pointed out. Especially, properties and roles of ionic liquids should be considered in energy storage. Ionic liquids can be used as electrolyte salts, electrolyte additives, and solvents. For optimizing ionic liquid‐based electrolytes for energy storage, their applications in various energy storage devices should be considered by combing native chemical/physical properties and their roles. We expect that this roadmap will give a useful guidance in directing future research in ionic liquid electrolytes for rechargeable batteries and supercapacitors.

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“…15 The use of ILs in supercapacitors as electrolytes or components of electrolytes is a topic of research interest. 16 Supercapacitors have emerged as electrical energy storage devices and have drawn the attention of the scientific community due to their higher energy density, safety (no explosion at high temperature as happens for organic electrolytes) 17 , long-term stability, and high performance. The efficiency of the capacitor primarily depends on the electrode material used, and the operating potential voltage determined by the electrochemical stability window (ECW) of the electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Comparative Investigation of Non-halogenated Imidazolium and Phosphonium-based Surface-Active Ionic Liquids as Electrolyte for Supercapacitors

Jain¹,

Antzutkin²

2021

Preprint

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We report a comparative analysis of non-halogenated surface-active ionic liquids (SAILs), which consists of the surface-active anion, 2-ethylhexyl sulfate, and the phosphonium, and imidazolium cations i.e., tetrabutylphosphonium ([P4444]+), trihexyl(tetradecyl)phosphonium ([P66614]+), and 1-methyl-3-hexylimidazolium ([C6C1IM]+). We explored the thermal and electrochemical properties, i.e., degradation, melting and crystallization temperatures, and ionic conductivity of this new class of IL. These SAILs were tested as an electrolyte in a multi-walled carbon nanotubes (MWCNTs)-based supercapacitor at various temperatures from 253 to 373 K. The electrochemical performance of different SAILs by varying the cationic core as a function of temperature were compared, in the same MWCNT-based supercapacitor. We found that the supercapacitor cell with [C6C1IM][EHS] shown high specific capacitance (Celec in F g-1), a high energy density (E in Wh kg-1), and a high power density (P in kW kg-1) when compared to those for the other SAILs i.e. [P4444][EHS], [P66614][EHS], and [N8888][EHS] at all temperatures. The supercapacitor with an MWCNT-based electrode and [C6C1IM][EHS], [P4444][EHS], and [P66614][EHS] as an electrolyte showed a specific capacitance of 148, 90, and 47 F g-1 (at the scan rate of 2 mV s-1) with an energy density of 82, 50, and 26 Wh kg-1 (at 2 mV s-1) respectively, at 298 K. The temperature effect can be seen by the three to four-fold increase in the specific capacitance of the cell and the energy density values, i.e., 290, 198, and 114 F g-1 (at 2 mV s-1) and 161, 110, and 63 Wh kg-1 (at 2 mV s-1), respectively, at 373 K. This study reveals that these new SAILs specifically [C6C1IM][EHS] and [P4444][EHS] can potentially be used as electrolytes in the wide range of temperature. The solution resistance (Rs), charge transfer resistance (Rct), and equivalent series resistance (ESR) also decreased with an increase in temperature for all SAILs as electrolytes. These new SAILs can explicitly be used for high-temperature (wide range of temperature) electrochemical applications, such as efficient supercapacitors for high energy storage due to enhanced specific capacitance, energy, and power density at elevated temperatures.

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Recognition of Ionic Liquids as High-Voltage Electrolytes for Supercapacitors

Cited by 83 publications

References 108 publications

Application of Ionic Liquids for Batteries and Supercapacitors

Application of Ionic Liquids for Batteries and Supercapacitors

Roadmap on Ionic Liquid Electrolytes for Energy Storage Devices

Comparative Investigation of Non-halogenated Imidazolium and Phosphonium-based Surface-Active Ionic Liquids as Electrolyte for Supercapacitors

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