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Practical use of a large capacity electric double layer capacitor for altitude use of the energy

大容量双电层电容器在高原能源利用中的实际应用

基本信息

批准号：
18560280
负责人：
OTSUBO Masahisa
金额：
$ 2.37万
依托单位：
University of Miyazaki
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560280/
关键词：
Altitude use of the energy Energy storage Electric double laver capacitor New energy Ketien black Carbon nanotube

项目摘要

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 … More 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

在这项工作中，它是第一次测量的正负电荷的时空行为的EDLC使用PEA方法。同时，通过PEA方法获得的电容与通过能量转换方法获得的电容进行了比较。结果，在使用比表面积为2000 m^2/g、平均孔径为2.72 nm的活性炭作为EDLC的电极材料的情况下，负电荷密度为约-173 C/m^2，正电荷密度为约70.7 C/m^2。正、负电荷在电极上的空间分布不均匀，电荷聚集区集中在电极的中心部位。PEA法测量的正负电荷行为反映了EDLC中异质电荷的分布。此外，为了提高电容，使用科琴黑代替常规使用的乙炔黑作为极化电极 ...更多信息活性炭基双电层电容器通常，科琴黑比乙炔黑具有更高的导电性，因此科琴黑可以被认为是导电填料。通过放电特性评价了所制备的双电层电容器的电容。结果表明，与乙炔黑相比，含双电层电容器的科琴黑具有很高的电容。特别是，8wt%的科琴黑含有EDLC显示出最高的电容在所制备的样品。结果表明，最佳合成工艺的比电容为59.2F/g。从含EDLC的10wt%乙炔黑和含8wt%科琴黑的电容的温度依赖性还发现，含EDLC的8wt%科琴黑在升高的温度下表现出非常稳定的电容。此外，为了提高双电层电容器的电容和电荷密度，对碳质材料进行了改性。研究了活性炭等离子体表面处理的最佳条件，处理时间为10 min ~ 1 h，处理温度为150℃。等离子体源是在N2中的高频辉光放电。操作气体压力为13.3Pa。设置电极使得EDLC样品被辉光放电覆盖。结果表明，等离子体表面处理提高了碳材料的空间电荷密度。此外，还对活性炭片进行了改性，以提高双电层电容器的容量和能量密度。等离子体表面处理进行了1，5，10，20，和30分钟。等离子体源是在氩气中的直流辉光放电。压力为20 Pa，正负电极之间的距离为20 mm，DC功率为70 W。设置活性炭片以覆盖具有DC辉光放电的片。作为等离子体表面处理的结果，具有活性炭片的EDLC单电池在较高的放电速率下变得更加显著，因为活性炭片的BET表面积随着氩等离子体蚀刻而增加。此外，等离子体表面处理可以提高EDLC单电池的电容。在高放电速率下，与具有原始活性炭片的EDLC电池相比，具有活性炭片的EDLC电池在1分钟等离子体表面处理后的电容增加了2%。少