Non-aqueous electrochemical capacitor utilizing electrolytic redox reactions of bromide species in ionic liquid

Yamazaki, Shigeaki; Itô, Tatsuya; Yamagata, Masaki; Ishikawa, Masashi

doi:10.1016/j.electacta.2012.01.031

Cited by 82 publications

(73 citation statements)

References 26 publications

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“…doping) carbon materials 6 or making the carbon into a monolithic binder-free coating on the electrode. 29,31 Thus, the mechanisms of charge storage accrued from redox electrolytes in SCs could be described based on the following three broad categories in relation with the retention of the redox species, particularly via electro-or chemisorption.…”

Section: Mechanisms Of Charge Storage In Supercapacitors Containing Rmentioning

confidence: 99%

“…Typical examples include "(+) AC | KI", (+) AC | Br − -ionic liquid, and "(+) AC | hydroquinone-H 2 SO 4 ". [5][6][7]29 (Here and below, AC stands for activated carbon. )…”

Section: Mechanisms Of Charge Storage In Supercapacitors Containing Rmentioning

confidence: 99%

“…11,16,[26][27][28][29] Research findings from these devices should however be analyzed with appropriate experimental and theoretical tools, and compared with that from batteries or other battery-like hybrid devices. In most cases, assessing the overall performance of SCs with redox electrolytes should not be based on capacitance or pseudocapacitance.…”

Section: Charge Storage Capacity Of Supercapacitors Containing Redox mentioning

confidence: 99%

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Redox Electrolytes in Supercapacitors

Akinwolemiwa

Peng

Chen

2015

J. Electrochem. Soc.

439

257

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Most methods for improving supercapacitor performance are based on developments of electrode materials to optimally exploit their storage mechanisms, namely electrical double layer capacitance and pseudocapacitance. In such cases, the electrolyte is supposed to be electrochemically as inert as possible so that a wide potential window can be achieved. Interestingly, in recent years, there has been a growing interest in the investigation of supercapacitors with an electrolyte that can offer redox activity. Such redox electrolytes have been shown to offer increased charge storage capacity, and possibly other benefits. There are however some confusions, for example, on the nature of contributions of the redox electrolyte to the increased storage capacity in comparison with pseudocapacitance, or by expression of the overall increased charge storage capacity as capacitance. This report intends to provide a brief but critical review on the pros and cons of the application of such redox electrolytes in supercapacitors, and to advocate development of the relevant research into a new electrochemical energy storage device in parallel with, but not the same as that of supercapacitors.

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Section: Mechanisms Of Charge Storage In Supercapacitors Containing Rmentioning

confidence: 99%

“…Typical examples include "(+) AC | KI", (+) AC | Br − -ionic liquid, and "(+) AC | hydroquinone-H 2 SO 4 ". [5][6][7]29 (Here and below, AC stands for activated carbon. )…”

Section: Mechanisms Of Charge Storage In Supercapacitors Containing Rmentioning

confidence: 99%

Section: Charge Storage Capacity Of Supercapacitors Containing Redox mentioning

confidence: 99%

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Redox Electrolytes in Supercapacitors

Akinwolemiwa

Peng

Chen

2015

J. Electrochem. Soc.

439

257

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“…[36][37][38][39][40] Recently we found that the bromide electrode reaction in 1-ethyl-3-methylimidazolium tetrafluoroborate RTIL with 1.0 mol L −1 1-ethyl-3-methylimidazolium bromide ([C 2 mim]Br) can be utilized as a positive electrode reaction in an electrochemical capacitor (EC) device. 41 This electrode enabled the quick charge and discharge of the EC device and the store of Br 2 and/or Br 3 − electrochemically produced during the charging process onto an activated carbon fiber cloth electrode with very high coulomb efficiency of almost 100% at 100 mA g −1 . If the electrode reaction occurs in the Lewis acidic AlBr 3 −1-ethyl-3-methylimidazolium bromide (AlBr 3 −[C 2 mim]Br) RTIL, we can create an ideal Al rechargeable energy storage device using two electrochemical reactions at the cathodic and anodic limiting potentials in the Lewis acidic RTIL, that is, Al electrodeposition/stripping at the negative electrode and electrochemicallyproduced Br 2 and/or Br 3 − adsorption/desorption at the positive electrode.…”

Section: -35mentioning

confidence: 99%

“…Recently we found that Br − /Br 3 − electrode reaction in a mixture of 1-ethyl-3-methylimidazolium tetrafluoroborate and [C 2 mim]Br proceeds on a carbon fiber cloth electrode and succeeded in fabrication of an electrochemical capacitor device with high discharge capacitance and excellent cycle characteristic by the use of the Br − /Br 3 − electrode reaction. 41 Also, several research groups have reported the electrode reaction that relates to Br − in RTILs. Second oxidation reaction processes at higher potential:…”

Section: Positive Electrode Reaction Using [Albr 4 ]mentioning

confidence: 99%

Electrochemical Energy Storage Device with a Lewis Acidic AlBr₃−1-Ethyl-3-methylimidazolioum Bromide Room-Temperature Ionic Liquid

Tsuda¹,

Kokubo²,

Kawabata³

et al. 2014

J. Electrochem. Soc.

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Now room-temperature ionic liquid (RTIL) is becoming a general term in the fields of science and technology owing to its useful physicochemical properties. A great number of applications with RTIL are proposed to date. Here we report an original electrochemical energy storage device with a Lewis acidic 60.0-40.0 mol% AlBr 3 −1-ethyl-3-methylimidazolioum bromide ([C 2 mim]Br) RTIL. The unique electrochemical reactions related to [AlBr 4 ] − anion on the positive electrode have a crucial role in the energy storage device. The charge-discharge ratio for the beaker cell prepared in this investigation was almost 100% at 2.0 ∼ 5.0 mA (150 ∼ 370 mA g −1 for activated carbon fiber cloth) if the cutoff voltage for the charging process was less than 1.70 V. The clear self-discharge behavior was not observed and the cell capacity after 100 cycles was identical to the maximum value. Rechargeable battery is a quite important energy storage device for sustaining our modern life. It is well-known that there are many types of rechargeable batteries. Of these, lithium-ion rechargeable battery has been already used in the various fields, but minor elements including lithium and cobalt are commonly used for the battery. It will become a major difficulty by further development of lithium-ion battery industry in the future. In addition, it seems to be unsuitable for a large scale electric storage system because of its insufficient rapid charge-discharge characteristics and safety issue. In recent years, a multivalent-metal ion, e.g., Mg(II), rechargeable battery system has attracted attention as a next generation high-capacity battery system because it can flow a larger current exceeding the lithium-ion rechargeable battery. [1][2][3][4] However it is difficult to electrochemically reduce such multivalent-metal ion due to its negative electrode potential. Even if the metal ion is reduced to metal state, in many cases, it would not achieve a sufficient coulomb efficiency in the chargedischarge process since the highly-reactive metal deposited on the negative electrode during the charging process easily reacts with the electrolyte. Another problematic point is that there are a limited number of choices on active materials for the positive electrode. If any, the active material does not show a favorable coulomb efficiency and the charge-discharge rate is not enough compared to that for current Li battery system.2-4 Another possible high-capacity electrochemical energy storage system is a redox flow battery, which has a low environmental impact and can store a huge energy. Unfortunately still many scientific and technological challenges, such as improvement in the electrolyte potential window and development of the separator that can perfectly protect the catholyte and anolyte against their undesirable contamination, remain. 5-9Room-temperature ionic liquids (RTILs) that are liquid salts at room-temperature, e.g., 298 K, have received considerable attention as novel reaction media, especially in this decade, because of their desirable ...

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Electrode Materials with Pseudocapacitive Properties

Frąckowiak

2013

Supercapacitors

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Non-aqueous electrochemical capacitor utilizing electrolytic redox reactions of bromide species in ionic liquid

Cited by 82 publications

References 26 publications

Redox Electrolytes in Supercapacitors

Redox Electrolytes in Supercapacitors

Electrochemical Energy Storage Device with a Lewis Acidic AlBr₃−1-Ethyl-3-methylimidazolioum Bromide Room-Temperature Ionic Liquid

Electrode Materials with Pseudocapacitive Properties

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Non-aqueous electrochemical capacitor utilizing electrolytic redox reactions of bromide species in ionic liquid

Cited by 82 publications

References 26 publications

Redox Electrolytes in Supercapacitors

Redox Electrolytes in Supercapacitors

Electrochemical Energy Storage Device with a Lewis Acidic AlBr3−1-Ethyl-3-methylimidazolioum Bromide Room-Temperature Ionic Liquid

Electrode Materials with Pseudocapacitive Properties

Contact Info

Product

Resources

About

Electrochemical Energy Storage Device with a Lewis Acidic AlBr₃−1-Ethyl-3-methylimidazolioum Bromide Room-Temperature Ionic Liquid