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2D Raman-THz spectroscopy of imidazolium-based ionic liquids.
J Chem Phys
January 2025
Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.
An investigation of the low-frequency (i.e., less than 5 THz), inter-molecular dynamics of three imidazolium-based ionic liquids-1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C4mim][NTf2]), 1-butyl-3-methylimidazolium dicyanamide ([C4mim][DCA]), and 1-ethyl-3-methylimidazolium dicyanamide ([C2mim][DCA])-is presented using two-dimensional (2D) Raman-THz spectroscopy combined with molecular dynamics (MD) simulations.
View Article and Find Full Text PDFRecent Advances on Characterization Techniques for the Composition-Structure-Property Relationships of Solid Electrolyte Interphase.
Small Methods
January 2025
College of Physics and Energy, Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, Fujian Normal University, Fuzhou, 350117, China.
The Solid Electrolyte Interphase (SEI) is a nanoscale thickness passivation layer that forms as a product of electrolyte decomposition through a combination of chemical and electrochemical reactions in the cell and evolves over time with charge/discharge cycling. The formation and stability of SEI directly determine the fundamental properties of the battery such as first coulombic efficiency (FCE), energy/power density, storage life, cycle life, and safety. The dynamic nature of SEI along with the presence of spatially inhomogeneous organic and inorganic components in SEI encompassing crystalline, amorphous, and polymeric nature distributed across the electrolyte to the electrolyte-electrode interface, highlights the need for advanced in situ/operando techniques to understand the formation and structure of these materials in creating a stable interface in real-world operating conditions.
View Article and Find Full Text PDFElectronic confinement induced quantum dot behavior in magic-angle twisted bilayer graphene.
Nanoscale
January 2025
Transport at Nanoscale Interfaces Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.
Magic-angle twisted bilayer graphene (TBLG) has emerged as a versatile platform to explore correlated electron phases driven primarily by low-energy flat bands in moiré superlattices. While techniques for controlling the twist angle between graphene layers have spurred rapid experimental progress, understanding the effects of doping inhomogeneity on electronic transport in correlated electron systems remains challenging. In this work, we investigate the interplay of confinement and doping inhomogeneity on the electrical transport properties of TBLG by leveraging device dimensions and twist angles.
View Article and Find Full Text PDFPrecise Synthesis of 4.75 V-Tolerant LiCoO with Homogeneous Delithiation and Reduced Internal Strain.
J Am Chem Soc
January 2025
College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid State Microstructures, Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China.
The rapid advancements in 3C electronic devices necessitate an increase in the charge cutoff voltage of LiCoO to unlock a higher energy density that surpasses the currently available levels. However, the structural devastation and electrochemical decay of LiCoO are significantly exacerbated, particularly at ≥4.5 V, due to the stress concentration caused by more severe lattice expansion and shrinkage, coupled with heterogeneous Li intercalation/deintercalation reactions.
View Article and Find Full Text PDFSpectroscopic investigation of proton bonding at sub-kelvin temperatures.
Phys Chem Chem Phys
January 2025
Center for Nanoscience and Sustainable Technologies (CNATS), Universidad Pablo de Olavide, 41013 Seville, Spain.
Article Synopsis
- The research focuses on understanding proton bonds, which are important in various scientific fields, by examining them at very low temperatures (around 0.4 K) to minimize thermal fluctuations.
- A proton is placed within a molecular ring cavity created by a 12-crown-4 ether, and infrared laser spectroscopy reveals narrow vibrational bands that indicate a strong proton bond across the ether sites.
- Standard modeling techniques struggle to accurately describe the observed vibrational data due to the anharmonic nature of the proton bond, highlighting the need for advanced computational methods to analyze the dynamic behavior of the crown ether at different temperatures.
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