1 research outputs found
LiFePO<sub>4</sub>/Mesoporous Carbon Hybrid Supercapacitor Based on LiTFSI/Imidazolium Ionic Liquid Electrolyte
A hybrid
SC prepared with mesoporous carbon as the negative electrode,
LiFePO<sub>4</sub> as the positive electrode, and a LiTFSI/imidazolium
ionic liquid solution as electrolyte is presented. The cell was conceived
on the basis that it offers all of the safety features of ionic liquids
(IL) and LiFePO<sub>4</sub>, in addition to the advantages of a high
energy density device. Most of the high performance hybrids so far
reported in the literature employ aqueous or organic electrolytes,
whereas studies of hybrid cells based on IL are still rare. Here,
a fundamental study was conducted to understand how the different
interfaces and mechanisms operate in a hybrid system based on IL electrolyte
and how this affects cell performance. This device was mainly characterized
using cyclic chronopotentiometry that allows cell voltage and electrode
potentials to be simultaneously recorded. By means of this technique,
it was possible to evaluate the overall behavior of the hybrid cell
and the faradaic and capacitive electrodes simultaneously and to compare
it with the performance of selected standard cells. The results show
that the cell is able to attain an energy density of 43.3 W h kg<sup>–1</sup> at 0.010 A g<sup>–1</sup> (C/5 in relation
to LiFePO<sub>4</sub>), while maintaining a good cycling performance