scholarly journals Polymerizable Ionic Liquids for Solid-State Polymer Electrolytes

Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 324 ◽  
Author(s):  
Robert Löwe ◽  
Thomas Hanemann ◽  
Andreas Hofmann
Keyword(s):  
Ionic Liquids ◽  
Ionic Conductivity ◽  
Polymer Electrolytes ◽  
High Yield ◽  
Dsc Analysis ◽  
Energy Storage Devices ◽  
Methyl Group ◽  
Storage Devices ◽  
Alkyl Groups ◽  
Phase Transition Temperatures

Eight new polymerizable ammonium-TFSI ionic liquids were synthesized and characterized with respect to an application in energy storage devices. The ionic liquids feature methacrylate or acrylate termination as polymerizable groups. The preparation was optimized to obtain the precursors and ionic liquids in high yield. All products were characterized by NMR and IR spectroscopy. Phase transition temperatures were obtained by DSC analysis. Density, viscosity and ionic conductivity of the ionic liquids were compared and discussed. The results reveal that the length of attached alkyl groups as well as the methyl group at the polymerizable function have significant influences on the ionic liquids physicochemical properties. Ionic conductivity values vary between 0.264 mS cm−1 for [C2NA,22]TFSI and 0.080 mS cm−1 for [C8NMA,22]TFSI at 25 °C. Viscosity values are within a range of 0.762 Pa s for [C2NA,22]TFSI and 1.522 Pa s for [C6NMA,22]TFSI at 25 °C.

scholarly journals Screening the Physical Properties of a Series of Water-in-Salt Electrolytes Using Computer Simulations

2020 ◽  
Author(s):  
Trinidad Mendez-Morales ◽  
Zhujie Li ◽  
Mathieu Salanne
Keyword(s):  
Ionic Liquids ◽  
Ionic Conductivity ◽  
Diffusion Coefficients ◽  
Free Water ◽  
Li Ion Batteries ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
New Family ◽  
Potential Applications ◽  
Li Ion

Water-in-salts form a new family of electrolytes with properties distinct from the ones of conventional aqueous systems and ionic liquids. They are currently investigated for Li-ion batteries and supercapacitors applications, but to date most of the focus was put on the system based on the LiTFSI salt. Here we study the structure and the dynamics of a series of water-in-salts with different anions. They have a similar parent structure but they vary systematically through their symmetric/asymmetric feature and the length of the fluorocarbonated chains. The simulations allow to determine their tendency to nanosegregate, as well as their transport properties (viscosity, ionic conductivity, diffusion coefficients) and the amount of free water, providing useful data for potential applications in energy storage devices.

Carboxylate-Functionalized Imidazolium-Based Binary Ionic Liquids as Electrolytes for Symmetric Carbon-Based Supercapacitors

2020 ◽  
Vol 998 ◽  
pp. 233-238
Author(s):  
Jonathan N. Patricio ◽  
Ser John Lynon P. Perez ◽  
Susan D. Arco
Keyword(s):  
Ionic Liquids ◽  
Ionic Conductivity ◽  
Porous Electrode ◽  
Electrospun Nanofibers ◽  
Ion Diffusion ◽  
Energy Storage Devices ◽  
Exchange Method ◽  
Storage Devices ◽  
Electrochemical Window ◽  
The Individual

Ionic liquids (ILs) containing 1-ethyl-3-methylimidazolium (EMIM) cations and carboxylate anions were prepared using solventless sonochemical synthesis followed by a facile halide-to-anion exchange method and were characterized for their structural and electrochemical properties. The structures of the synthesized ILs were found to significantly affect their electrochemical window (EW) and varied anions exhibited different reductive and oxidative limits. Ionic conductivity and cyclic voltammetry measurements revealed that [EMIM] hexanoate and [EMIM]2[oxalate] offered relatively high ionic conductivity values and wide EWs. A 1:1 binary IL mixture based on the synthesized ILs was prepared and its EW was found to significantly vary as compared with the EWs of the individual component ILs. Supercapacitor prototypes were then fabricated with edge-oxidized graphene sheets as conductive additives for the electrodes and electrospun nanofibers as separator membranes. An electric-double layer capacitive behaviour associated to the ion diffusion process of the electrolyte ions onto the porous electrode surface was shown and quasi-rectangular curves were observed having no redox peaks at any point in the generated repetitive voltammograms. These considerable results have shown valuable insights for further development of binary IL electrolytes for energy storage devices.

How Certain Are the Reported Ionic Conductivities of Thiophosphate-Based Solid Electrolytes? an Interlaboratory Study

2020 ◽  
Author(s):  
Saneyuki Ohno ◽  
Tim Bernges ◽  
Johannes Buchheim ◽  
Marc Duchardt ◽  
Anna-Katharina Hatz ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Ionic Conductivity ◽  
Relative Standard Deviation ◽  
Solid Electrolytes ◽  
Ionic Conductivities ◽  
Ionic Conductors ◽  
Energy Storage Devices ◽  
Activation Barriers ◽  
Storage Devices ◽  
Relative Standard

<p>Owing to highly conductive solid ionic conductors, all-solid-state batteries attract significant attention as promising next-generation energy storage devices. A lot of research is invested in the search and optimization of solid electrolytes with higher ionic conductivity. However, a systematic study of an <i>interlaboratory reproducibility</i> of measured ionic conductivities and activation energies is missing, making the comparison of absolute values in literature challenging. In this study, we perform an uncertainty evaluation via a Round Robin approach using different Li-argyrodites exhibiting orders of magnitude different ionic conductivities as reference materials. Identical samples are distributed to different research laboratories and the conductivities and activation barriers are measured by impedance spectroscopy. The results show large ranges of up to 4.5 mScm<sup>-1</sup> in the measured total ionic conductivity (1.3 – 5.8 mScm<sup>-1</sup> for the highest conducting sample, relative standard deviation 35 – 50% across all samples) and up to 128 meV for the activation barriers (198 – 326 meV, relative standard deviation 5 – 15%, across all samples), presenting the necessity of a more rigorous methodology including further collaborations within the community and multiplicate measurements.</p>

Gel Electrolyte Based Supercapacitors with Higher Capacitances and Lower Resistances than Devices with a Liquid Electrolyte

MRS Advances ◽  
2018 ◽  
Vol 3 (22) ◽  
pp. 1261-1267 ◽  
Author(s):  
Belqasem Aljafari ◽  
Arash Takshi
Keyword(s):  
Polymer Electrolytes ◽  
Room Temperature ◽  
Electrochemical Impedance ◽  
Liquid Electrolyte ◽  
Gel Electrolyte ◽  
Superior Performance ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Gel Electrolytes ◽  
Further Development

ABSTRACTRecently, gel polymer electrolytes (GPEs) have been drawn noteworthy attention for different applications, specifically, for supercapacitors. GPEs could become an excellent substitute to liquid electrolytes (LEs) for making flexible and more durable devices. The performance of two different electrolytes (GPEs and LEs) in multi-wall carbon nanotube based supercapacitors were investigated. In spite of significantly lower conductivity of GPEs than LEs, devices with the gel electrolyte presented a superior performance. More focused has been given in this work on demonstrating the performance of supercapacitors based on GPEs and LEs at different concentrations of the acids ranging from 1M to 3M. Both electrolytes have been characterized at room temperature by making supercapacitors and using cyclic voltammetry, charging-discharging, electrochemical impedance spectroscopy, and leakage tests. The experimental results showed that GPE devices had much better capacitances and resistances compare to the LE based devices. Moreover, the capacitances of all devices were increased proportionally with the increase in the concentration from 1M to 3M, and the resistances were increased inversely with the decreased of concentration. The promising results from the gel electrolytes is encouraging for further development of flexible and high capacitance energy storage devices.

Water in Protic Ionic Liquids: Properties and Use of a New Class of Electrolytes for Energy‐Storage Devices

ChemSusChem ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3827-3836 ◽  
Author(s):  
Timo Stettner ◽  
Sascha Gehrke ◽  
Promit Ray ◽  
Barbara Kirchner ◽  
Andrea Balducci
Keyword(s):  
Ionic Liquids ◽  
Energy Storage ◽  
Protic Ionic Liquids ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
New Class

Ionic Liquids in Surface Protection of Aluminum and Its Alloys

2019 ◽  
Author(s):  
Joaquin Arias-Pardilla ◽  
Tulia Espinosa ◽  
José Sanes ◽  
Ana Eva Jiménez ◽  
Ginés Martínez-Nicolás ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Industrial Applications ◽  
Energy Storage Devices ◽  
New Techniques ◽  
Surface Protection ◽  
Storage Devices ◽  
Potential Applications

Aluminum and its alloys are used in an increasing number of applications but the development of surface coatings and new techniques for corrosion resistance enhancement and for increasing wear resistance will be determinant for applications under aggressive environments. Ionic liquids have already found many industrial applications, including their use in surface protection. The present article will focus on the use of ionic liquids in aluminum and its alloys surface protection applications, including corrosion protection and inhibition, anodization and passivation processes, wear resistance, and potential applications of ionic liquid electrolytes in energy storage devices.

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