Dielectric-electrolyte supercapacitors

Electrolyte limitation of fast discharge in lithium batteries and supercapacitors

Interactions between Graphene and Ionic Liquid Electrolyte in Supercapacitors

The graphene material prepared by the chemical reduction method usually has oxygenic functional groups in it and such functional groups often result in interactions between the graphene electrode and the electrolyte in supercapacitors. We have examined the existential form of interactions between graphene as the electrode and three kinds of ionic liquid, 1-ethyl-3-methylimidazolium bis (trifluo...

Graphene quantum dots as the electrolyte for solid state supercapacitors

We propose that graphene quantum dots (GQDs) with a sufficient number of acidic oxygen-bearing functional groups such as -COOH and -OH can serve as solution- and solid- type electrolytes for supercapacitors. Moreover, we found that the ionic conductivity and ion-donating ability of the GQDs could be markedly improved by simply neutralizing their acidic functional groups by using KOH. These neut...

A zwitterionic gel electrolyte for efficient solid-state supercapacitors

Gel electrolytes have attracted increasing attention for solid-state supercapacitors. An ideal gel electrolyte usually requires a combination of advantages of high ion migration rate, reasonable mechanical strength and robust water retention ability at the solid state for ensuring excellent work durability. Here we report a zwitterionic gel electrolyte that successfully brings the synergic adva...

Dielectric relaxation of electrolyte solutions using terahertz transmission spectroscopy

We use terahertz ~THz! transmission spectroscopy to obtain the frequency dependent complex dielectric constants of water, methanol, and propylene carbonate, and solutions of lithium salts in these solvents. The behavior of the pure solvents is modeled with either two ~water! or three ~methanol and propylene carbonate! Debye relaxations. We discuss the effects of ionic solvation on the relaxatio...