Electrochemical Performance of Activated Carbon Electrode Added with LiCoO_2 for Hybrid Capacitor

摘要

In this study, mixed active material electrodes, composed of an activated carbon (MSP20) and LiCoO_2, were prepared as cathodes for a high-capacitive hybrid capacitor. The electrochemical properties of (MSP20+LiCoO_2)/Li cells were examined in terms of the weight composition and the particle size of LiCoO_2 powder in the electrodes. As adding more LiCoO_2 powders in the electrode, the volumetric capacity (m Ah/ml) of the electrode became higher. In order to examine the size effect on the electrochemical performance, the LiCoO_2 powders were modified by ball milling. The (MSP20+LiCoO_2)/Li cells using 10 and 20 wt.% of 30h-milled LiCoO_2 powder exhibited the lower internal resistivities and the better capacity retentions after 100 charge-discharge cycles than those using 10 or 20 wt.% of raw LiCoO_2 powders.