1 research outputs found
Selective Charging Behavior in an Ionic Mixture Electrolyte-Supercapacitor System for Higher Energy and Power
Ion–ion interactions in supercapacitor
(SC) electrolytes
are considered to have significant influence over the charging process
and therefore the overall performance of the SC system. Current strategies
used to weaken ionic interactions can enhance the power of SCs, but
consequently, the energy density will decrease due to the increased
distance between adjacent electrolyte ions at the electrode surface.
Herein, we report on the simultaneous enhancement of the power and
energy densities of a SC using an ionic mixture electrolyte with different
types of ionic interactions. Two types of cations with stronger ionic
interactions can be packed in a denser arrangement in mesopores to
increase the capacitance, whereas only cations with weaker ionic interactions
are allowed to enter micropores without sacrificing the power density.
This unique selective charging behavior in different confined porous
structure was investigated by solid-state nuclear magnetic resonance
experiments and further confirmed theoretically by both density functional
theory and molecular dynamics simulations. Our results offer a distinct
insight into pairing ionic mixture electrolytes with materials with
confined porous characteristics and further propose that it is possible
to control the charging process resulting in comprehensive enhancements
in SC performance