Active material for anode of lithium ion capacitor manufacturing method for the same and lithium ion capacitor comprising the same

摘要

As a negative electrode active material for a lithium ion capacitor, the active material is provided with a negative electrode active material for a lithium ion capacitor, characterized in that it comprises modified graphite with an edge surface exposed. According to the present invention, after the graphite is added to the hydrogen peroxide water, the graphite is heated and again subjected to ultrasonic treatment, so that the present invention induces etching of the graphite with the hydrogen peroxide water to modify the graphite. As a result, the movement of lithium ions through the edge of the modified graphite is facilitated, and by forming a chemically bonded SEI layer, anion of the electrolyte is prevented from being intercalated with graphite, thereby preventing graphite peeling. As a result, the lithium ion capacitor including the negative electrode diffusion material according to the present invention can obtain an energy density of about 55% higher than that of a conventional unmodified graphite lithium ion capacitor.