Long-term thermal stability of five imidazolium ionic liquids

Salgado, Juan José; Villanueva, M.; Parajó, Juan José; Fernández, Josefa

doi:10.1016/j.jct.2013.05.049

Cited by 88 publications

(77 citation statements)

References 36 publications

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“…These methods make the assumption that the parameters of the model are identical for measurements at all heating rates. It allows for a direct fit of the model to the experimental data without any transformation [10]. An additional advantage lies in the fact that there are no limitations with respect to the complexity of the model; consequently, it is reliable for solving applied kinetic problems [68][69][70][71].…”

Section: Kinetic Parameters and Modellingmentioning

confidence: 99%

“…These properties mean that ILs are excellent candidates for various applications, including their use as environmentally friendly solvents for replacing traditional volatile organic ones [7,8]. Currently, growing interest is focused on the use of ILs for high temperature applications, such as thermal fluids and electrolytes for solar cells and fuel cells [9,10]. Significant research has been focused on the thermophysical properties of imidazolium-based ILs [11,12], but there are only a few studies focused on a novel class of ILs based on phosphorous quaternary cations [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…In these cases, some isothermal experiments were measured at low temperatures (below onset temperature) and kinetic parameters were determined assuming zero-order processes [10,27]. Therefore, a prediction of the longterm stability of ILs based on the modelling of non-isothermal TG measurements enables to reduce significantly the time required to carry out the experiment, resulting in a considerable cost reduction [23].…”

Section: Introductionmentioning

confidence: 99%

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Isoconversional kinetic analysis applied to five phosphonium cation-based ionic liquids

et al. 2017

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Thermal degradation of five phosphonium cation-based ionic liquids ([P 66614 outperforming the other ones in both pyrolytic and oxidising conditions. Although the thermal degradation mechanism is affected by atmospheric conditions, the degradation trend remains practically constant. As the dynamic methodology usually overestimates the long-term thermal stability, an isoconversional methodology is better for predicting the long-term thermal stability of these ionic liquids in order to be used as base oil or additive in lubricants formulation. Finally, the model-free methodology can predict at lower costs the ILs performance in isothermal conditions. Highlights• Weakly coordinating anions provoke good thermal stability of ILs.• • Isoconversional methods are better than dynamic ones for long-term thermal studies.• Activation energy behavior at low conversions is related to a single reaction.• Model-free methodology can predict the ILs performance in isothermal conditions.

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Section: Kinetic Parameters and Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Isoconversional kinetic analysis applied to five phosphonium cation-based ionic liquids

et al. 2017

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“…A thermogravimetric analyzer (TGA 7-Perkin Elmer) operating in dynamic and isothermal modes under nitrogen and air atmosphere was used to perform thermogravimetric analysis [7][8][9][10].…”

Section: Methodsmentioning

confidence: 99%

“…Each analysis was repeated three times. Determination procedures of onset and endset temperatures were described in previous papers [7][8][9][10][11][12]. Furthermore, isothermal TG analysis at temperatures lower than tonset, was used to determine the long-term thermal stability of ILs.…”

Section: Methodsmentioning

confidence: 99%

<strong>Thermophysical characterization of ionogels of ethylamonium nitrate as advanced electrolytes for electrochemical devices</strong>

Parajó

López

Rodríguez

et al. 2017

Proceedings of the 21st International Electronic Conference on Synthetic Organic Chemistry

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Abstract:Among the multiple applications of ionic liquids (ILs) and ionogels, electrolytes for electrochemical devices have a highlighted position. The interest in mixtures of ILs with alkaline metals salts has increased in the last years, since the presence of some electrochemically active species, is required for any electrochemical application of these designer solvents, e.g. in batteries.Although physical characterization of common ILs, as ethylammonium nitrate (EAN), is extensively performed and published, thermophysical characterization of its ionogels is not yet well developed.In this work, the liquid range and thermal stability of ionogels of EAN and its mixtures with lithium nitrate (LiNO3), an inorganic salt with a common anion, were measured. Differential Scanning Calorimetry was employed to determine the melting and freezing temperatures, observing that the pure IL and mixture melt at 12 ºC and 3 ºC, respectively, whereas no processes associated to the formation of a crystalline phase was observed for ionogels.Moreover, using a thermogravimetric analyzer operating in dynamic and isothermal modes under dry air and nitrogen atmospheres, thermal stability analysis was performed. Pure IL and ionogels showed similar thermogravimetric curves characterized by a loss mass in a single step starting at 200 ºC and finishing at 300 ºC, approximately.

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Hexagonal Boron Nitride‐Based Electrolyte Composite for Li‐Ion Battery Operation from Room Temperature to 150 °C

Rodrigues

Kalaga

Gullapalli

et al. 2016

Advanced Energy Materials

128

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Batteries for high temperature applications capable of withstanding over 60 °C are still dominated by primary cells. Conventional rechargeable energy storage technologies which have exceptional performance at ambient temperatures employ volatile electrolytes and soft separators, resulting in catastrophic failure under heat. A composite electrolyte/separator is reported that holds the key to extend the capability of Li‐ion batteries to high temperatures. A stoichiometric mixture of hexagonal boron nitride, piperidinium‐based ionic liquid, and a lithium salt is formulated, with ionic conductivity reaching 3 mS cm−1, electrochemical stability up to 5 V and extended thermal stability. The composite is used in combination with conventional electrodes and demonstrates to be stable for over 600 cycles at 120 °C, with a total capacity fade of less than 3%. The ease of formulation along with superior thermal and electrochemical stability of this system extends the use of Li‐ion chemistries to applications beyond consumer electronics and electric vehicles.

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Long-term thermal stability of five imidazolium ionic liquids

Cited by 88 publications

References 36 publications

Isoconversional kinetic analysis applied to five phosphonium cation-based ionic liquids

Isoconversional kinetic analysis applied to five phosphonium cation-based ionic liquids

<strong>Thermophysical characterization of ionogels of ethylamonium nitrate as advanced electrolytes for electrochemical devices</strong>

Hexagonal Boron Nitride‐Based Electrolyte Composite for Li‐Ion Battery Operation from Room Temperature to 150 °C

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