Magnetic field effect and controlling of Li amounts of cathode material for high performance in LIC

Li-doped high surface area of activated carbon (LHSAC) for Li ion capacitor (LIC) has been prepared by controlling the LiOH amounts for surface modification. The main purpose is the controlling of Li amounts by easy insertion-disinsertion reaction with magnetic field between cathode and anode. The physical properties of the sample were analyzed by the XRD, EIS, SEM, TEM, EDS, and Raman spectroscopy. The surface functional group analysis indicated the final sample had hydrophilic groups or the hydrophilicity that leads to improve the permeability of the electrolyte through the working electrode (WE). The electrochemical activity and the reusability of the xLHSAC were evaluated through a cyclic voltammetry (CV) test under different scan rates (mV/s) and magnetic core treatments (0.07 T and 0.14 T). The CV curves, the profile, and the redox current density of each sample were varied depending on the active sites, the surface, and the ion transfer way of the WE. The prepared working electrodes were stable during long-term recycling experiments, and the electrochemical properties of xLHSAC were significantly increased by magnetic core processing. In addition, the 3LYP80F sample performed better than other samples, which confirms that the material is a promising electrode material for high-performance LIC.