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

Sung, Youl-Moon

doi:10.4313/teem.2007.8.4.182

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

Transactions on electrical and electronic materials, v.8 no.4, 2007년, pp.182 - 187

Sung, Youl-Moon (Department of Electrical Electronic Engineering, Kyungsung University)

Abstract ▼ AI-Helper

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.

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대상 데이터

Each component had a sectional area of 314 mm². The active material consisted of nanoporous carbon, the mixture of the PTFE binder (Aldrich, 60 wt% dispersion in H₂O) and carbon black. The carbon black was added to decrease the ohmic resistance of the electroactive material.

이론/모형

The measured data are useful for quantitative analyses of the charge accumulation and the charge transport. In this work, we measured the spatio-temporal behavior of positive and negative charges in EDLCs using the PEA method. At the same time, we compared the electrostatic capacity obtained by the PEA method with those obtained by the energy conversion method.
The electrostatic capacity of EDLCs can be obtained by the energy conversion method. An example of oscilloscope trace of a discharge voltage of EDLCs is shown in Fig.
Table 1 indicates the properties of the carbonaceous electrode materials prepared under various conditions. The specific area and pore-size distribution of these carbonaceous materials were calculated from nitrogen adsorption isotherms at 77 K (Tristar 3000) using the Brunauer, Emmett and Teller (BET) method and Barrett, Joyner and Halenda (BJH) method.

참고문헌 (14)

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DOI : 10.4313/TEEM.2007.8.4.182
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