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http://dx.doi.org/10.5714/CL.2017.22.070

High-energy-density activated carbon electrode for organic electric-double-layer-capacitor using carbonized petroleum pitch  

Choi, Poo Reum (Department of Chemical Engineering, Myongji University)
Kim, Sang-Gil (R&D Center, Vitzrocell Co. Ltd.)
Jung, Ji Chul (Department of Chemical Engineering, Myongji University)
Kim, Myung-Soo (Department of Chemical Engineering, Myongji University)
Publication Information
Carbon letters / v.22, no., 2017 , pp. 70-80 More about this Journal
Abstract
Activated carbons (ACs) have been used as electrode materials of electric double-layer capacitors (EDLC) due to their high specific surface areas (SSA), stability, and ecological advantages. In order to make high-energy-density ACs for EDLC, petroleum pitch (PP) pre-carbonized at $500-1000^{\circ}C$ in $N_2$ gas for 1 h was used as the electrode material of the EDLC after KOH activation. As the pre-carbonization temperature increased, the SSA, pore volume and gravimetric capacitance tended to decrease, but the crystallinity and electrode density tended to increase, showing a maximum volumetric capacitance at a medium carbonization temperature. Therefore, it was possible to control the crystalline structure, SSA, and pore structure of AC by changing the pre-carbonization temperature. Because the electrode density increased with increasing of the pre-carbonization temperature, the highest volumetric capacitance of 28.4 F/cc was obtained from the PP pre-carbonized at $700^{\circ}C$, exhibiting a value over 150% of that of a commercial AC (MSP-20) for EDLC. Electrochemical activation was observed from the electrodes of PP as they were pre-carbonized at high temperatures above $700^{\circ}C$ and then activated by KOH. This process was found to have a significant effect on the specific capacitance and it was demonstrated that the higher charging voltage of EDLC was, the greater the electrochemical activation effect was.
Keywords
activated carbon; petroleum pitch; EDLC; electrochemical activation; volumetric capacitance;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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