Abstract
Ionic-liquids (IL) inside conductive porous media can be used to make electrical energy storage units. Many parameters such as the shape of the pores and the type of IL affect the storage performance. In this work, a simple IL model inside two geometrically different slit-pores is simulated and their capacitive properties are measured. The pores were of finite length, one of them was linear and the other had a convex extra space in the center. The molecular dynamics simulations are done for two, qualitatively, low and high molarities. The pores have been simulated for both initially filled or empty conditions. Differential capacitance, induced charge density, and IL dynamics are calculated for all of the systems.
Highlights
Ionic-liquids (IL) inside conductive porous media can be used to make electrical energy storage units
Since the electric storage in these devices is related to the attraction-repulsion of the ions to the electrode surfaces, the conductive nanoporous media, such as carbide-derived carbon[9], are a good candidate to be used as electrodes
The researches show that charging process in electrical double-layer capacitors (EDLC) have a lots of mechanisms and parameters affecting on their capacitive performance, such as self discharge due to redox reactions[11], overscreening and crowding in dense electrolytes[12], electrochemical potential windows (EPW) of IL13, and changes in volume for the electrodes[14]
Summary
Ionic-liquids (IL) inside conductive porous media can be used to make electrical energy storage units Many parameters such as the shape of the pores and the type of IL affect the storage performance. Supercapacitors are called electrical double-layer capacitors (EDLC) because of the layered configurations of electrolyte or IL near the electrode surfaces. They are expected to have great power performances, high capacitance and theoretically unlimited charge-discharge cycle[7]. If a charged particle or ion gets near to the electrode’s surface, there would be an increase of induced opposite charges on the surface This is the mechanism of electrical energy storage. There are numerous researches on the different electrodes geometries such as, planar electrodes[20,21], slit-pores[17,23,29], combining flat and porous electrodes[30], cylindrical pores[29,31], spherical electrodes[31], carbon nanotubes forest[32], mathematically flat electrodes vs atomic structured electrodes[33], atomic rough vs atomic non-rough electrode surfaces[10] and so on
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