Quantitative analysis of lithium compounds on the electrode surface and electrical conductivity with pure CNT effects for Li-ion capacitor application

초록

In the case of lithium-ion capacitors (LIC), power density or rate performance is greatly limited by conductive materials due to differences in ion and electron conduction mechanisms. Due to the surface modification, different functional groups are generated, which is confirmed that these lithium salts were formed by the reaction of lithium with the functional group present on the surface of the electrode material. The functional group of lithium compound was confirmed from the chemical analysis results, and possible structures were proposed for them through simulation. In addition, the correlation between the amounts of lithium compounds formed on the electrode and electrical conductivity was studied using four types of electrodes according to the content of CNT. We analyzed using powdered X-ray diffraction (XRD), Raman spectroscopy, XPS, FTIR, SEM, TEM, Cyclic voltammetry (CV), and various electrochemical experiments. According to the YPCNT 15 results, it has good adsorption pore width that strongly impacts the effectiveness of adsorption and kinetics. Increased amount of MWCNTs (YPCNT 15) to extensively impact on the current density range 0.45 (ma/cm2) and excellent rate of performance with the density of 29 (Wh/g) and capacitance 0.45 (F/g) that enhance as the insertion and deinsertion of Li-ions. Furthermore, it was proved that the characteristics are improved through evaluation of their characteristics. From the results of comparing the electrochemical properties of the manufactured half-cell, YPCNT15 showed improved results in all the measured result values depending on the content of the added CNT.

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