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J. Electrochem. Sci. Technol > Volume 1(1); 2010 > Article
Journal of Electrochemical Science and Technology 2010;1(1):63-68.
DOI: https://doi.org/10.5229/JECST.2010.1.1.063   
Electrochemical Behavior of Lithium Titanium oxide/activated Carbon Composite for Electrochemical Capacitor
Jeong-Jin Yang, Hong-Il Kim, Young-Jae Yuk, Han-Joo Kim, Soo-Gil Park
Department of Industrial Engineering Chemistry, Chungbuk National University;Department of Industrial Engineering Chemistry, Chungbuk National University;PureEchem Co., Ltd.;PureEchem Co., Ltd.;Department of Industrial Engineering Chemistry, Chungbuk National University;
Abstract
The $Li_4Ti_5O_{12}$/AC composite was prepared by sol-gel process with ultrasonication. The prepared composite was characterized by SEM, XRD and TG analysis, and their electrochemical behaviors were investigated by cyclic voltammetry, electrochemical impedance spectroscopy and charge-discharge test in 1M $LiBF_4$/PC electrolyte. From the results, the $Li_4Ti_5O_{12}$ particles coated on AC surface had an average particle size of 100 nm and showed spinel-framework structure. When the potential range of the $Li_4Ti_5O_{12}$/AC composite was extended from 0.1 to 2.5 V, redox peaks and electric double layer property were revealed. The initial discharge capacity of $Li_4Ti_5O_{12}$/AC composite was 218 mAh $g^{-1}$ at 1 C. The enhancement of discharge capacity was attributed to electric double layer of added activated carbon.
Keywords: $Li_4Ti_5O_{12}$, activated carbon, electric double layer, electrochemical capacitor


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