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

• 영문명: High-energy-density activated carbon electrode for organic electric-double-layer-capacitor using carbonized petroleum pitch
• 발행기관: 한국탄소학회
• 저자명: Poo Reum Choi,Sang-Gil Kim,Ji Chul Jung,Myung-Soo Kim
• 간행물 정보: 『Carbon Letters』제22권, 70~80쪽, 전체 11쪽
• 주제분류: 자연과학 > 자연과학일반
• 파일형태: PDF
• 발행일자: 2017.04.01

영문 초록

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) precarbonized at 500？1000°C in N2 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°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°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.

목차

1. Introduction

2. Experimental

3. Results and Discussion

4. Conclusions

References

키워드

activated carbon,petroleum pitch,EDLC,electrochemical activation,volumetric capacitance