Study on High Density Activated Carbons for Electrode Materials of Supercapacitor

초고용량 커패시터 전극활성물질용 고밀도 활성탄 제조 및 특성 연구

  • Roh, Kwang Chul (Department of Electric and Electronic Engineering, Yonsei University) ;
  • Park, Jin Bae (Department of Electric and Electronic Engineering, Yonsei University) ;
  • Lee, Chul-Tae (Department of Chemical Engineering, Dankook University) ;
  • Park, Chul Wan (Center for Advanced Batteries, Korea Electronics Technology Institute/Department of Bio-Nano, Kyungwon University)
  • 노광철 (연세대학교 전기전자공학과) ;
  • 박진배 (연세대학교 전기전자공학과) ;
  • 이철태 (단국대학교 공학부 화학공학전공) ;
  • 박철완 (전자부품연구원 차세대전지센터/경원대학교)
  • Received : 2007.06.21
  • Accepted : 2007.07.16
  • Published : 2007.08.10

Abstract

High density activated carbons electrode materials, for supercapacitor were prepared by chemical KOH activation of cokes as the starting material under Ar atmosphere. By controlling the synthesis conditions and reducing KOH quantity in the activation step, the specific surface area of the product was decreased. BET surface area was measured to be $500{\sim}1260m^2/g$, and the electrode density was in the range of $0.68{\sim}0.83g/cm^3$. Volumetric specific capacitance (unit cell test) was as high as 20 F/cc, which corresponds to gravimetric specific capacitance of about 95 F/cc on the basis of half cell test. It should be noted that the specific capacitance of the activated carbons prepared in this study is superior to that of commercial activated carbons.

Keywords

high density activated carbon;supercapacitor;EDLC;capacitance

References

  1. Cooper, www.bussmann.com
  2. J. P. Zheng and T. R. Jow, J. Electrochem. Soc., 142, L6 (1995)
  3. JEOL, www.jeol.co.jp
  4. A. W. Stienecker, T. Stuart, and C. Ashtiani, J. Power Sources., 156, 755 (2006) https://doi.org/10.1016/j.jpowsour.2005.06.014
  5. I. Tanahashi, A. Yoshida, and A. Nishino, Carbon, 28, 477 (1990) https://doi.org/10.1016/0008-6223(90)90041-V
  6. M. Sasaki, I. Notsu, and S. Ara, Proceedings of JSAE., No. 20005215 2-00 (2000)
  7. T. R. Jow and J. P. Zheng, J. Electrochem. Soc., 145, 49 (1998)
  8. Power Systems, www.powersystems.co.jp
  9. NESSCAP, www.nesscap.com
  10. M. Sasaki, S. Araki and I. No, Proceedings of JSAE., No. 20015569 102-01 (2001)
  11. J. P. Zheng, P. J. Cygan, and T. R. Jow, J. Electrochem. Soc., 142, 2699 (1995)
  12. B. E. Conway, J. Electrochem. Soc., 138, 1539 (1991) https://doi.org/10.1149/1.2085829
  13. B. E. Conway, Electrochemical Supercapacitors, Plenum Publishing, New York (1999)
  14. J. Takehara, N. Ohkubo, K. Miyaoka, and T. Hukuda, Electrochemical capacitors., II, 190 (1996)
  15. U.S. Patent 3,634,736 (1972)
  16. I. Tanahashi, A. Yoshida, and A. Nishino, J. Electrochem. Soc., 137, 3952 (1990)