Electrochemical Behavior of Oxygen/Superoxide Ion Couple in 1-Butyl-1-methylpyrrolidinium Bis(trifluoromethylsulfonyl)imide Room-Temperature Molten Salt

Katayama, Yasushi; Sekiguchi, Kaori; Yamagata, Masaki; Miura, Takashi

doi:10.1149/1.1946530

Cited by 111 publications

(140 citation statements)

References 12 publications

Supporting

Mentioning

118

Contrasting

Order By: Relevance

“…In addition, the diffusion process of hydrogen is not influenced by the apparent viscosity of ILs as presented in Figure 4. This behaviour is consistent with the diffusion of oxygen [13,14] in TFSA-based ILs, because there is almost no electrostatic interaction between the organic ions and the hydrogen or oxygen molecules. We conjecture that the trialkylphosphinebased cations can be assisted by the mass transport of the hydrogen molecule, because the diffusion coefficients of hydrogen in trialkylphosphinebased ILs are relatively larger than those in quaternary phosphonium-based ILs.…”

Section: Diffusion Coefficients Of Hydrogen In Phosphonium-based Ilssupporting

confidence: 82%

Electrochemical Behaviour of Hydrogen in Low-Viscosity Phosphonium Ionic Liquids

Matsumiya

Tsunashima²,

Kodama³

2011

Zeitschrift Für Naturforschung A

View full text Add to dashboard Cite

The electrochemical and diffusive properties of hydrogen in low-viscosity phosphonium ionic liquids were investigated by the electrochemical methods such as cyclic voltammetry and chronoamperometry. The hydrogen redox reactions were concluded to be a quasi-reversible system in phosphonium-based ionic liquids. The diffusion coefficients of hydrogen in these ionic liquids were of the order of 10 −10 m 2 s −1 at 25 • C. Additionally, the obtained activation energy of the diffusion process for hydrogen was 11.2 -15.9 kJ mol −1 estimated from the temperature dependence of the diffusion coefficients.A new type of proton conducting medium such as triethylphosphonium bis(trifluoromethylsulfonyl)amide was synthesized by the neutralization reaction, because the trialkylphosphine-based ionic liquids with good stability at higher temperature and high conductivity were appropriate candidates. This proton conducting membrane containing the ionic liquids with trialkylphosphine-based cations and the polyvinylidenefluoride-co-hexafluoropropylene has been fabricated in the present study. The proton conducting membrane exhibits relatively high ionic conductivity along with good mechanical stability.

show abstract

Section: Diffusion Coefficients Of Hydrogen In Phosphonium-based Ilssupporting

confidence: 82%

Electrochemical Behaviour of Hydrogen in Low-Viscosity Phosphonium Ionic Liquids

Matsumiya

Tsunashima²,

Kodama³

2011

Zeitschrift Für Naturforschung A

View full text Add to dashboard Cite

show abstract

“…20,21,22 The reactivity of O 2 •− with the electrolyte can even increase the specific discharge capacity of the O 2 -electrode, as was observed for alkylcarbonate based electrolytes, 24 imidazolium based ionic liquids, 23 as well as for water contaminated electrolytes; 24 this negatively affects the reversibility of the reaction. On the other hand, ionic liquids with pyrrolidinium (or piperidinium) cations and bis(trifluoromethylsulfonyl)imide (TFSI) anion 25 have been reported to be stable against O 2 •− attack, at least within the timescale of voltammetric measurements, by some research groups 20,[26][27][28][29] and among them ours. 30 Thus, because of their stability against both O 2 •− attack and anodic oxidation, the expectation for a usable electrolyte for Li-O 2 batteries was loaded on pyrrolidinium 23,31 or piperidinium 32 cations and TFSI anion; they were indeed examined in Li-O 2 test cells, but, unfortunately, only the first cycle or the first few cycles has been shown in the literature.…”

mentioning

confidence: 97%

Stability of a Pyrrolidinium-Based Ionic Liquid in Li-O₂Cells

Piana

Wandt

Meini

et al. 2014

J. Electrochem. Soc.

View full text Add to dashboard Cite

The use of 1-methyl-1-butylpyrrolidinium bis(trifluoromethylsulfonyl)imide (Pyr 14 TFSI) electrolyte in different Li-O 2 cell setups is here investigated. In a one-compartment Li-O 2 cell, the pyrrolidinium ion is reduced on metallic lithium, producing substantial amounts of alkenes and amines. To avoid this, a simple two-compartment cell is used, with propylene carbonate as anode electrolyte and a Li + -ion solid electrolyte as separator. Another explored option is the substitution of lithium in the one-compartment cell with lithiated LTO (LLTO). Unfortunately, the absence of an SEI leads to the reduction of O 2 at LLTO, making it not useful as counter electrode for Li-O 2 cell evaluation. All the configurations above are characterized by a first discharge specific capacity double than that obtained with unreactive electrolytes. The use of an edge-sealed two-compartment LLTO-Vulcan cell resulted in the usual discharge capacity of ≈200 mAh g −1 C at the first cycle, eliminating the effects of Pyr 14 TFSI reduction; nevertheless, the poor cyclability even in this cell design suggests that Pyr 14 TFSI might not have sufficient long-term stability against the attack of O 2•− during discharge or of oxygen species during charge. © The Author Ionic liquids have attracted much attention as electrolyte solutions for many electrochemical applications in the last decade, like electrochemical actuators and electrochromic windows 1 dye-sensitized solar cells 2 waste treatment, 3 supercapacitors 4 and lithium batteries. 5,6 This is due to their unique properties, like non-flammability and negligible vapor pressure, which would improve battery safety, and their low melting point and reasonably low viscosity, enabling their use as solvents even at room temperature. Another attractive property is their very high anodic electrochemical stability 7 that widens the potential window in which they can be employed in electrochemical applications. Even though their production and purification is more demanding than organic solvents due to their ionic character, they are easy to separate and recycle.All these properties made them attractive also as electrolyte solvents in the non-aqueous Li-O 2 secondary batteries, introduced by K.M. Abraham et al. in 1996. 8 Owing to the high specific capacity of the oxygen cathode of Li-O 2 batteries, their potential application for full-electric vehicles attracted much interest, promising to extend vehicle range. Their practical specific energy, including the weight of inactive electrode components and electrolyte, has been estimated in a recent review, 9 which claims a practically achievable specific energy of 1300 Wh kg −1 for Li-O 2 cells, which would be a roughly four-fold improvement over state-of-the-art Li-ion batteries. 10 It is important to note, however, that a more recent analysis of the battery-system level specific energy achievable with Li-O 2 vs. Li-ion batteries suggests that the specific energy improvement would be less than two-fold and the volumetric energy density would be infe...

show abstract

“…This feature is commonplace within neat IL electrolytes wherein the process kinetics and mass transport may be mutually sluggish and the overall O 2 reduction process is quasi-reversible. [61][62][63] Plots of the cathodic reduction peak current density, j p c vs. v 1/2 revealed mostly linear dependencies on the current magnitude with significant deviations occurring only at the higher scan rates. Plots j p c vs. v 1/2 for each studied electrolyte are shown in Figure S7 in the ESI along with the respective CV traces.…”

mentioning

confidence: 99%

Physical and Electrochemical Investigations into Blended Electrolytes Containing a Glyme Solvent and Two Bis{(trifluoromethyl)sulfonyl}imide-Based Ionic Liquids

Neale

Goodrich

Hughes

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

In this paper, we report on thermophysical and electrochemical investigations of a series of molecular solvent/ionic liquid (IL) binary mixture electrolytes. Tetraethylene glycol dimethyl ether (TEGDME) is utilized as the molecular solvent component in separate mixtures with two bis{(trifluoromethyl)sulfonyl}imide anion based ILs paired with similarly sized cyclic and acyclic alkylammonium cations; 1-butyl-1-methylpyrrolidinium bis{(trifluoromethyl)sulfonyl}imide, [Pyrr 14 ] [TFSI], or N-butyl-N,N-dimethyl-N-ethylammonium bis{(trifluoromethyl)sulfonyl}imide, [N 1124 ] [TFSI]. The blending of ILs with select molecular solvents is an important strategy for the improvement of the typically sluggish transport capabilities of these interesting electrolytic solvents. Bulk volumetric and transport properties are reported as a function of temperature and binary mixture formulation; demonstrating the capacity for enhancing desired properties of the IL. Micro-disk electrode voltammetry and chronoamperometry in O 2 -saturated binary mixture electrolytes was used to assess the effect of formulation on the solubility and diffusivity of the dissolved gas. In addition, further investigations of the behavior of the O 2 redox couple at a GC macro-disk electrode are discussed. The exploration of ionic liquids (ILs) as alternatives to conventional molecular solvents in electrolyte formulations is continually growing for a variety of electrochemical applications. These low melting organic salts can be tailored to exhibit a variety of properties, including hydrophobicity and thermal, chemical, and electrochemical stability, which make them attractive candidate electrolyte solvents. Composed solely of ionic components, ILs consequently possess intrinsic electrolytic conductivity and are additionally non-volatile. These properties have encouraged the use of ILs as (complete or partial) substitutions of the volatile components of commercial Li-ion batteries, electrochemical double layer capacitors (EDLCs), and other prospective battery technologies (e.g. Na-ion, Mg-ion and metal-air batteries) for the development of potentially safer devices.1-15 Furthermore, the high (electro)chemical stabilities and non-volatilities exhibited by many IL structures provides interesting electrolyte media for electrochemical gas sensors (e.g. for O 2 , 16-19 CO 2 , 20,21 NO 2 22 ) where traditional solvents are prone to evaporation leading to device failure, and also for electromechanical actuator, 23-25 and electrodeposition applications. [26][27][28] Nevertheless, while the properties of ILs are dependent on the virtually unlimited combinations of different cation and anion structures, the attractive features are generally coupled with sluggish transport properties relative to conventional electrolytes based on either aqueous or organic solvents. In turn, electrochemical devices constructed with neat IL electrolytes are likely to suffer transport limitations on useable current rates for the given application, for example restricting power capabiliti...

show abstract

Electrochemical Behavior of Oxygen/Superoxide Ion Couple in 1-Butyl-1-methylpyrrolidinium Bis(trifluoromethylsulfonyl)imide Room-Temperature Molten Salt

Cited by 111 publications

References 12 publications

Electrochemical Behaviour of Hydrogen in Low-Viscosity Phosphonium Ionic Liquids

Electrochemical Behaviour of Hydrogen in Low-Viscosity Phosphonium Ionic Liquids

Stability of a Pyrrolidinium-Based Ionic Liquid in Li-O₂Cells

Physical and Electrochemical Investigations into Blended Electrolytes Containing a Glyme Solvent and Two Bis{(trifluoromethyl)sulfonyl}imide-Based Ionic Liquids

Contact Info

Product

Resources

About

Electrochemical Behavior of Oxygen/Superoxide Ion Couple in 1-Butyl-1-methylpyrrolidinium Bis(trifluoromethylsulfonyl)imide Room-Temperature Molten Salt

Cited by 111 publications

References 12 publications

Electrochemical Behaviour of Hydrogen in Low-Viscosity Phosphonium Ionic Liquids

Electrochemical Behaviour of Hydrogen in Low-Viscosity Phosphonium Ionic Liquids

Stability of a Pyrrolidinium-Based Ionic Liquid in Li-O2Cells

Physical and Electrochemical Investigations into Blended Electrolytes Containing a Glyme Solvent and Two Bis{(trifluoromethyl)sulfonyl}imide-Based Ionic Liquids

Contact Info

Product

Resources

About

Stability of a Pyrrolidinium-Based Ionic Liquid in Li-O₂Cells