Room-temperature ionic liquids are promising candidates for applications ranging from electrolytes for energy storage devices to lubricants for food and cellulose processing to compounds for pharmaceutics, biotransformation, and biopreservation. Due to the ion complexity, many room-temperature ionic liquids readily form amorphous phases upon cooling, even at modest rates. Here, we investigate two commonly studied imidazolium-based room-temperature ionic liquids, 1-ethyl-3-methylimidazolium tetrafluoroborate and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, as well as their mixtures, to demonstrate how the complex interplay between the crystalline and amorphous phases is affected by the processing conditions, such as thermal history, liquid mixing, and applied pressure. We show that quantum tunneling in the cation methyl groups, measured by high-resolution inelastic neutron scattering, can be used to probe the order-disorder in room-temperature ionic liquids (crystalline vs amorphous state) that develops as a result of variable processing conditions.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8024031 | PMC |
| http://dx.doi.org/10.1063/4.0000094 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Unlocking Solid-State Sodium-Metal Batteries at -15 °C by Electrolyte Optimization and Interface Regulation.
ACS Appl Mater Interfaces
December 2024
Tianjin Key Laboratory for Photoelectric Materials and Devices, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, P.R. China.
Beta-AlO-based solid-state sodium metal batteries are some of the best options for large-scale energy storage systems because of their high energy density, high-level safety, and low cost. Nevertheless, their room-/low-temperature operation remains challenging due to low ionic conductivity of Beta-AlO electrolyte and weak solid-solid contact of the Na/Beta-AlO interface. Herein, an integrated strategy was developed via electrolyte optimization and interface regulation, in which Cu as a stabilizing agent was incorporated into Beta-AlO to improve density and ionic conductivity and the InS interface layer was introduced between the Na anode and solid electrolyte to induce the in situ formation of a mixed conductive layer (Na-In alloy and NaS).
View Article and Find Full Text PDFSingle Particle Dynamics at the Free Surface of Imidazolium-Based Ionic Liquids.
J Phys Chem B
December 2024
Department of Chemistry, Eszterházy Károly Catholic University, Leányka utca 12, H-3300 Eger, Hungary.
In this work, we carry out a systematic computer simulation investigation of the single particle dynamics at the free surface of imidazolium-based room temperature ionic liquids by applying intrinsic surface analysis. Besides assessing the effect of the potential model and temperature, we focus in particular on the effect of changing the anion type, and, hence, their shape and size. Further, we also address the role of the length of the cation alkyl chains, known to protrude into the vapor phase, on the surface dynamics of the ions.
View Article and Find Full Text PDFNon-Flammable fluorinated gel polymer electrolyte for safe lithium metal batteries in harsh environments.
J Colloid Interface Sci
December 2024
Jiangsu Key Laboratory of Materials and Technologies for Energy Storage, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Compared to liquid electrolytes, gel polymer electrolytes (GPEs) offer enhanced safety and represent an up-and-coming option for high-energy-density lithium metal batteries (LMBs). However, several challenges hindered the practical application of GPEs for LMBs, such as low ionic conductivity at room temperature, decomposition at high voltage, and poor interfacial compatibility with lithium anode. In this study, a non-flammable fluorinated GPE was synthesized using 2,2,2-trifluoroethyl acrylate (TFEA) and ethoxylated trimethylolpropane triacrylate (ETPTA) as precursor materials, with succinonitrile (SN) incorporated as a plasticizer and a dual-salt system of lithium bis(trifluoro-methane) sulfonimide and lithium difluoroxalate borate.
View Article and Find Full Text PDFCoherent-Precipitation-Stabilized Phase Formation in Over-Stoichiometric Rocksalt-Type Li Superionic Conductors.
Adv Mater
December 2024
Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.
Rationalizing synthetic pathways is crucial for material design and property optimization, especially for polymorphic and metastable phases. Over-stoichiometric rocksalt (ORX) compounds, characterized by their face-sharing configurations, are a promising group of materials with unique properties; however, their development is significantly hindered by challenges in synthesizability. Here, taking the recently identified Li superionic conductor, over-stoichiometric rocksalt Li-In-Sn-O (o-LISO) material as a prototypical ORX compound, the mechanisms of phase formation are systematically investigated.
View Article and Find Full Text PDFEfficient ion transport mode and stable Li-interface induced by the introduction of HA-SiO in PVDF-based electrolytes for solid-state lithium metal batteries.
J Colloid Interface Sci
December 2024
Department of Physics, Nanchang University, Nanchang 330031, China. Electronic address:
Polyvinylidene fluoride (PVDF) materials have been widely investigated as polymer matrix for solid polymer electrolytes (SPEs) due to their high dielectric constant, electroactive effect (piezo-, pyro-, and ferroelectricity), and excellent thermal stability. However, the poor interface compatibility caused by highly reactive residual solvents and unsatisfactory ionic conductivity owing to sluggish Li transport kinetics are principal bottlenecks impeding the further development of PVDF-based electrolytes. Herein, we design a PVDF-based electrolytes with the assistance of hydrophilic-amorphous silica (HA-SiO).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!