2007 Fiscal Year Final Research Report Summary
Practical use of a large capacity electric double layer capacitor for altitude use of the energy
| Project/Area Number |
18560280
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | University of Miyazaki |
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Principal Investigator |
OTSUBO Masahisa University of Miyazaki, Faculty of Engineering, Professor (90041011)
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| Co-Investigator(Kenkyū-buntansha) |
HONDA Chikahisa University of Miyazaki, Faculty of Engineering, Professor (20037881)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Altitude use of the energy / Energy storage / Electric double laver capacitor / New energy / Ketien black / Carbon nanotube |
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| Research Abstract |
In this work, it is first measured the spatio-temporal behavior of positive and negative charges in EDLC using the PEA method. At the same time, the capacitance obtained by the PEA method was compared with those obtained by the energy conversion method. As the results, in the case of using activated carbon which has 2000 m^2/g of specific surface area and 2.72 ran of average pore diameter as the materials of electrode for EDLC, negative charge density was about -173 C/m^2 and positive charge density was about 70.7 C/m^2. The result also showed that the distributions of positive/negative charges were spatially uneven and that the charge accumulation region concentrated on central part of the carbonaceous electrode of EDLC. The behavior of negative and positive charges measured by the PEA method reflected the hetero-charges distribution in EDLC. Additionally, ketjen black was used for polarized electrodes instead of conventionally used acetylene black in order to improve the capacitance
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of activated carbon-based EDLC. Usually, ketjen black exhibits higher conductivity compared with acetylene black, so that ketjen black could be considered as conducting filler. The capacitance of prepared EDLC was evaluated through discharge characteristics. It was found that the ketjen black containing EDLC showed very high capacitance compared to acetylene black one. Especially, 8 wt% ketjen black containing EDLC showed the highest capacitance among the prepared samples. The specific capacitance of the best one was evaluated as 59.2F/g. It was also found that the 8 wt% ketjen black containing EDLC exhibited very stable capacitance at elevated temperature from temperature dependence of capacitance for 10 wt% acetylene black containing EDLC and 8 wt% ketjen black one. Furthermore, carbonaceous materials were modified in order to improve capacitance and charge density in EDLC. Optimal conditions for plasma surface treatment of activated carbon have been examined for times from 10 min to 1 h at 150℃. The plasma source was a high-frequency glow discharge in N2. The operating gas pressure was 13.3 Pa. The electrode was set up so that the EDLC sample was covered with the glow discharge. As the results, space charge density was improved by the plasma surface treatment of carbon materials. Moreover, an activated carbon sheet was modified, to improve capacitance and energy density of EDLC. The plasma surface treatments were carried out for 1, 5, 10, 20, and 30 min. The plasma source was a DC glow discharge in argon gas. The pressure was 20 Pa and the distance between positive and negative electrodes was 20 mm. DC power was 70W. The activated carbon sheets were set up to cover the sheets with the DC glow discharge. As the results of plasma surface treatment, EDLC single cells with the activated carbon sheets became more marked at higher discharge rate because the BET surface area of activated carbon sheet increased with argon plasma etching. In addition, capacitance of EDLC single cells can be improved by the plasma surface treatment. Capacitance of the EDLC cells with the activated carbon sheets after 1 min plasma surface treatment was increased 2% compares to EDLC cells with the original activated carbon sheet at a high discharge rate. Less
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Research Products
(36 results)
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[Journal Article] Space charge behaviors of electric double layer capacitor with nanocomposite electrode2007
Author(s)
D., Tashima, K., Kurosawatsu, M., Uota, T., Karashima, Y. M., Sung, M., Otsubo, C., Honda
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Journal Title
Surface and Coatings Technology Vol.201 No.9-11
Pages: 5392-5395
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Space Charge Distributions of an Electric Double Layer Capacitor with Carbon Nanotube Electrode2007
Author(s)
D., Tashima, K., Kurosawatsu, M., Uota, T., Karashima, Y. M., Sung, M., Otsubo, C., Honda
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Journal Title
Thin Solid Film Vol.515 No.9
Pages: 4234-4239
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Plasma Surface Treatment of Carbonaceous Materials for Application in Electric Double Layer Capacitors2006
Author(s)
D., Tashima, K., Kurosawatsu, M., Uota, T., Karashima, Y. M., Sung, M., Otsubo, C., Honda
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Journal Title
Japanese Journal of Applied Physics Vol.45 No.10
Pages: 8521-8524
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Thickness Dependence of Carbon Electrode on Space Charge of Electric Double Layer Capacitor2007
Author(s)
D., Tashima, M., Taniguchi, M., Otsubo, A., Okazaki, S., Araki
Organizer
IEEE Conference on Electrical Insulation And Dielectric Phenomena
Place of Presentation
Vancouver, BC, Canada
Year and Date
2007-10-16
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Effect of Surface Modification of Carbon Electrode for Electric Double Layer Capacitor using Dielectric Barrier Discharge2007
Author(s)
M., Esaki, M., Taniguchi, T., Hamada, D., Tashima, T., Sakoda, M., Otsubo
Organizer
The Sixth Asian-European International Conference on Plasma Surface Engineering
Place of Presentation
Yasuragi-Ioujima Nagasaki
Year and Date
2007-09-27
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Thermal Dependence of Space Charge in Electric Double Layer Capacitor2007
Author(s)
D., Tashima, K., Kurosawatsu, M., Taniguchi, M., Otsubo, C., Honda
Organizer
15th International Symposium on High Voltage Engineering
Place of Presentation
L(jubljana, Slovenia)
Year and Date
2007-08-29
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Surface modification of Carbon Electrode using Argon Plasma2007
Author(s)
D., Tashima, A., Sakamoto, M., Taniguchi, T., Sakoda, M., Otsubo
Organizer
The 9th International Symposium on Sputtering and Plasma Process
Place of Presentation
Kanazawa international hotel, Kanazawa
Year and Date
2007-06-07
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Surface Modification of Carbon Electrode for Electric Double Layer Capacitors2006
Author(s)
D., Tashima, K., Kurosawatsu, Y. M., Sung, M., Otsubo, C., Honda
Organizer
Tenth International Conference on Plasma Surface Engineering
Place of Presentation
Garmisch- Partenkirchen, Germany
Year and Date
2006-09-12
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Surface Modification of Nano Porous Materials for Electric Double Layer Capacitors Application2006
Author(s)
D., Tashima, K., Kurosawatsu, Y. M., Sung, M., Otsubo, C., Honda
Organizer
8th Asia-Pacific Conference on Plasma Science and Technology and 19th Symposium on Plasma Science for Materials
Place of Presentation
Cairns, Australia
Year and Date
2006-07-04
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Effect of Nitrogen Atom Doping for Electric Double Layer Capacitors Application2006
Author(s)
D., Tashima, K., Kurosawatsu, Y. M., Sung, M., Otsubo, C., Honda
Organizer
8th International Conference on Properties and Application of Dielectric Materials
Place of Presentation
Bali, Indonesia
Year and Date
2006-06-27
Description
「研究成果報告書概要(欧文)」より
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