Abstract
ABSTRACT: The Li 4 Ti 5 O 12 /AC composite was prepared by sol-gel process with ultrasonication. The preparedcomposite was characterized by SEM, XRD and TG analysis, and their electrochemical behaviorswere investigated by cyclic voltammetry, electrochemical impedance spectroscopy and charge-dischargetest in 1 M LiBF 4 /PC electrolyte. From the results, the Li 4 Ti 5 O 12 particles coated on AC surface hadan average particle size of 100 nm and showed spinel-framework structure. When the potentialrange of the Li 4 Ti 5 O 12 /AC composite was extended from 0.1 to 2.5 V, redox peaks and electric doublelayer property were revealed. The initial discharge capacity of Li 4 Ti 5 O 12 /AC composite was218 mAh g −1 at 1 C. The enhancement of discharge capacity was attributed to electric double layerof added activated carbon.Keywords :Li 4 Ti 5 O 12 , activated carbon, electric double layer, electrochemical capacitor. Received August 23, 2010 : Accepted September 30, 2010 1. Introduction Electrochemical capacitors (ECs), also called super-capacitor, are electrochemical energy storage devices. Thefeatures of ECs are similar to those of electric double layercapacitor (EDLC) and rechargeable batteries. They maystore charge in a Faradaic reaction as pseudocapacitanceor may store charge in the double-layer of an electrode/electrolyte interphase.
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