Spatio-temporal Charge Distribution in Electric Double Layer Capacitors observed by pulsed Electro Acoustic Method

  • Sung, Youl-Moon (Department of Electrical Electronic Engineering, Kyungsung University)
  • Published : 2007.08.31


The use of the pulsed electro acoustic (PEA) method allowed us to perform the direct observations of spatio-temporal charge distributions in Electric double layer capacitors (EDLCs) based on polarizable nanoporous carbonaceous electrode. The negative charge density became the maximum, about $205C/m^3$ at the region where was near to collector layer in EDLCs for case $V_{DC}=2.5V$, while the positively charged density became the maximum, about $61.1C/m^3$ at the region where it was located around the cathode layer. The performance of the best sample was found to be better in terms of the charge density (Cs) and specific energy ($E_s$) with a maximum value of ${\sim}8.4F/g$ and 26 Wh/kg. The $C_s$ obtained from the PEA method agreed well with that from the energy conversion method. The PEA measurement used here is a very useful method to quantitively investigates the spatio-temporal charge distribution in EDLCs.


  1. Brian. E. Conway, 'Electrochemical Supercapacitors', NTS, p. 15,2001
  2. Y. Kibi, T. Saito, M. Kurata, J. Tabuchi, and A. Ochi, 'Fabrication of high-power electric doublelayer capacitors', Journal of Power Sources, Vol. 60, p. 219, 1996
  3. M. Takeuchi, T. Maruyama, K. Koike, A. Mogami, T. Oyama, and H. Kobayashi, 'Non-porous carbon for a high energy density electric double layer capacitor', Electrochemistry, Vol. 69, No.6, p. 487, 2001
  4. M. Okamura, H. Hasuike, M. Yamagishi, and S. Araki, 'A status report on the power storage system of capacitor-electronics', Electrochemistry, Vol. 69, No.6, p. 414, 2001
  5. Y.-M. Sung, 'Charging and discharging characteristics of electric double layer capacitors used for a storage battery of solar energy', Trans. EEM, Vol. 8, No.2, p. 97,2007
  6. K. H. An, K. K. Jeon, J. K. Heo, S. C. Lim, D. J. Bae, and Y. H. Lee, 'High-capacitance supercapacitor using a nanocomposite electrode of single-walled carbon nanotube and polypyrrole', Journal of The Electrochemical Society, Vol. 149, p. A1058, 2002
  7. M. Morita, S. Watanabe, M. Ishikawa, H. Tamai, and H. Yasuda, 'Utilization of activated carbon fiber with mesopore structure for electric double layer capacitors', Electrochemistry, Vol. 69, p. 462, 2001
  8. E. Lust, A. Janes, and M. Arulepp, 'Influence of electrolyte characteristics on the electrochemical parameters of electrical double layer capacitors', J. Solid State Electrochem., Vol. 8, p. 488, 2004
  9. D. Tashima, K. Kurosawatsu, M. Uota, T. Karashima, Y. M. Sung, M. Otsubo, C. Honda, and C. Honda, 'Space charge behaviors of electric double layer capacitors with nanocomposite electrode', Surface and Coatings Technology, Vol. 201, p. 5392,2007
  10. C. Zhang, T. Mizutani, K. Kaneko, T. Mori, and M. Ishioka, 'Space charge behaviors of low-density polyethylene blended with polypropylene copolymer', Polymer, Vol. 43, p. 2261, 2002
  11. Y. H. Kwon, S. Hwangbo, J. H. Lee, D. Y. Yi, and M. K. Han, 'The space charge effect on the discharge current in cross-linked polyethylene under high AC voltages', Jpn. J. Appl. Phys., Vol. 42,p.7576, 2003
  12. W. Du, W. Zhong, Y. Lin, L. Shen, and Q. Du, 'Space charge distribution and crystalline structure in polyethylene blended with EVOH', European Polymer Journal, Vol. 40, p. 1987, 2004
  13. D. Tashima, K. Kurosawatsu, M. Uota, T. Karashima, Y. M. Sung, M. Otsubo, and C. Honda, 'Plasma surface treatment of carbonaceous materials for application in electric double layer capacitors', Jpn. J. Appl. Phys., Vol. 45, p. 8521, 2006
  14. D. Tashima, K. Kurosawatsu, M. Uota, T. Karashima, M. Otsubo, C. Honda, and Y. M. Sung, 'Space charge distributions of an electric double layer capacitor with carbon nanotubes electrode', Thin Solid Films, Vol. 515, p. 4234, 2007