Related Experiment Video
Updated: Feb 21, 2026
05:33
Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
22.4K
Exceptionally High Electric Double Layer Capacitances of Oligomeric Ionic Liquids
Michio Matsumoto1, Sunao Shimizu2, Rina Sotoike3
1Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Journal of the American Chemical Society
|October 12, 2017
Summary
A novel oligomeric ionic liquid, IL4TFSI, significantly boosts electric double layer (EDL) capacitor performance. This material achieves high capacitance and a wide electrochemical window, advancing energy storage technology.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Electric double layer (EDL) capacitors require high capacitance and operating voltages for next-generation energy storage.
- Few electrolytes can simultaneously meet these demanding requirements.
Purpose of the Study:
- To investigate the potential of an oligomeric ionic liquid, IL4TFSI, as an advanced electrolyte for EDL capacitors.
- To evaluate its electrochemical window and EDL capacitance compared to monomeric ionic liquids.
Main Methods:
- Electrochemical impedance spectroscopy was used to measure EDL capacitance with gold (Au) working electrodes.
- Hall-effect measurements were employed to determine carrier accumulation capability in a field-effect transistor (FET) setup.
Main Results:
- IL4TFSI demonstrated a wide electrochemical window of approximately 5.0 V.
- An exceptionally high EDL capacitance of approximately 66 μF/cm2 was achieved, about six times higher than monomeric ionic liquids.
- An EDL-based FET utilizing IL4TFSI showed enhanced carrier accumulation of approximately 64 μF/cm2.
Conclusions:
- Oligomeric ionic liquids like IL4TFSI offer a promising pathway to high-performance EDL capacitors.
- IL4TFSI significantly enhances both capacitance and carrier accumulation, outperforming traditional monomeric ionic liquids.
More Related Videos
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
13.5K
12:00Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
14.9K
Related Concept Videos
01:31Dielectric Polarization in a Capacitor
6.1K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
6.1K
01:18Capacitor With A Dielectric
5.0K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
5.0K
03:13Intermolecular Forces
73.3K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
73.3K
01:26Susceptibility, Permittivity and Dielectric Constant
3.2K
When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
3.2K
01:25MOS Capacitor
1.6K
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
1.6K
03:08Electrolytes: van't Hoff Factor
37.3K
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
37.3K