Room temperature ionic liquid electrolytes for redox flow batteries

Ejigu, Andinet; Greatorex-Davies, Peter A.; Walsh, Darren A.

doi:10.1016/j.elecom.2015.01.016

Cited by 54 publications

(58 citation statements)

References 27 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[7] Some pioneering examples include organic RFBs based on quinoid-type redox couples in acid [8] and alkaline electrolytes. [9] Another encouraging research line is the substitution of aqueous electrolytes by non-aqueous electrolytes [10] or even ionic liquids, [11] which are more electrochemically stable and would allow achieving higher battery voltages and energy densities. [12,13] In the last few years, RFBs based on organic redox molecules, such as quinones, phenothiazine, nitroxides, viologens, and pyridines [14][15][16][17] have experienced a great deal of interest, becoming one of the hottest topics in electrochemical energy storage (see Table S1 in the Supporting Information).…”

mentioning

confidence: 99%

A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes

et al. 2017

View full text Add to dashboard Cite

Flexible and scalable energy storage solutions are necessary for mitigating fluctuations of renewable energy sources. The main advantage of redox flow batteries is their ability to decouple power and energy. However, they present some limitations including poor performance, short‐lifetimes, and expensive ion‐selective membranes as well as high price, toxicity, and scarcity of vanadium compounds. We report a membrane‐free battery that relies on the immiscibility of redox electrolytes and where vanadium is replaced by organic molecules. We show that the biphasic system formed by one acidic solution and one ionic liquid, both containing quinoyl species, behaves as a reversible battery without any membrane. This proof‐of‐concept of a membrane‐free battery has an open circuit voltage of 1.4 V with a high theoretical energy density of 22.5 Wh L−1, and is able to deliver 90 % of its theoretical capacity while showing excellent long‐term performance (coulombic efficiency of 100 % and energy efficiency of 70 %).

show abstract

mentioning

confidence: 99%

A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In previous studies, 87,90 we noticed that the dependence of the prepeak on temperature for the P 14,6,6,6 + /NTf 2 − IL was at odds with that in other systems. 42,82 The current study will demonstrate that this is generic behavior for all studied anions; when the P 14,6,6,6 + cation is included, a temperature increase always results in an intensity increase at q values associated with the prepeak.…”

Section: -39mentioning

confidence: 99%

“…Several researchers have studied the structure of selected ionic liquids based on the P 14,6,6,6 + cation. 72,87,90,113,116,117,122 In particular, Gontrani et al studied the tetradecyltrihexylphosphonium chloride IL using X-ray scattering and molecular dynamics simulations (MD) and observed the existence of nanoscale segregation.…”

Section: -39mentioning

confidence: 99%

“…Instead, upon a temperature increase, the apolar subcomponents contribute to what would be an expected decrease of prepeak intensity. C Ongoing research on ionic liquids (ILs) continues to grow due to numerous possible applications including CO 2 capture, 1-13 energy storage, [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] and cellulose processing.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Communication: Nanoscale structure of tetradecyltrihexylphosphonium based ionic liquids

Hettige

Araque

Kashyap

et al. 2016

The Journal of Chemical Physics

View full text Add to dashboard Cite

“…Due to the excellent properties, ILs have been utilized as novel and promising materials in many research fields. For example, ILs can be utilized in energy conversion and energy storage, including solar cells [1][2][3][4][5][6][7], batteries [8][9][10][11][12][13][14][15][16], and supercapacitors [17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Measurements of ionic liquids thermal conductivity and thermal diffusivity

Zhao

Zhen

Jelle

et al. 2016

J Therm Anal Calorim

View full text Add to dashboard Cite

Thermal conductivity and thermal diffusivity of ionic liquids (ILs) are investigated in this work. A hot disk method for ILs thermal conductivity and thermal diffusivity measurement is utilized. Firstly, the thermal conductivity of water is measured to check the reliability of the hot disk method. In addition, the thermal conductivity of pure ILs, including BmimBF4, BmimPF6, OmimCl, BmimFeCl4, and OmimFeCl4, is measured. By comparison with thermal conductivity values of water, BmimBF4, and BmimPF6 in the literatures, it is found that the thermal conductivity values of ILs using hot disk method has high reliability. Therefore, the hot disk method is utilized for thermal conductivity measurement of ILs in this work. The experimental results also show that all the average thermal conductivity values of the 5 pure ILs are no more than 0.1898 Wm -1 K -1 , which is much lower than the average measured thermal conductivity of water, namely 0.6033 Wm -1 K -1 . Effect of nanoparticles (NPs) on thermal conductivity of ILs is also investigated.It is shown that the thermal conductivity of BmimBF4 does not change significantly in the presence of 2 diffusivity of water is 0.143 mm 2 s -1 in the literature. It illustrates that the ILs also have a better thermal property than water for energy storage. ILs may be utilized as novel materials for energy storage. Effect of NPs on thermal diffusivity of ILs is also investigated. The results are similar to how NPs influence thermal conductivity of BmimBF4 and BmimPF6. In the presence of Fe2O3 NPs, thermal diffusivity of BmimBF4 does not change significantly. However, in the presence of R711 NPs, thermal diffusivity of BmimPF6 decreases somewhat.

show abstract

Room temperature ionic liquid electrolytes for redox flow batteries

Abstract: ABSTRACT

Cited by 54 publications

References 27 publications

A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes

A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes

Communication: Nanoscale structure of tetradecyltrihexylphosphonium based ionic liquids

Measurements of ionic liquids thermal conductivity and thermal diffusivity

Contact Info

Product

Resources

About