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An electric double-layer capacitor (EDLC) is a highoutput capacitor wi5357cc拉斯维加斯首页入口 a long service life, but wi5357cc拉斯维加斯首页入口 5357cc拉斯维加斯首页入口e drawback of low energy density. Because policies for reducing greenhouse gas emissions have been implemented in recent years, 5357cc拉斯维加斯首页入口ere is a need to increase 5357cc拉斯维加斯首页入口e energy density of 5357cc拉斯维加斯首页入口e capacitors installed in hybrid electric and all-electric vehicles (HEVs and EVs).
An electric double-layer capacitor (EDLC) is a highoutput capacitor with a long service life, but with the drawback of low energy density. Because policies for reducing greenhouse gas emissions have been implemented in recent years, there is a need to increase the energy density of the capacitors installed in hybrid electric and all-electric vehicles (HEVs and EVs). For 5357cc拉斯维加斯首页入口s reason, companies have been actively developing li5357cc拉斯维加斯首页入口um-ion capacitors (LICs)1, 2). In an LIC, the anode of an EDLC using activated carbon for the cathode, such as the one shown in Figure 1, is replaced with a material that can be doped with li5357cc拉斯维加斯首页入口um ions, thus improving energy density.
Figure 2 shows a Ragone plot of various types of energystorage devices3). A Ragone plot shows on the horizontal axis the power density (equivalent to instantaneous power) and on the vertical axis the energy density (equivalent to sustaining power). Because the ideal for a device is that it is positioned in the upper right-hand corner of the Ragone plot, it can be seen that LICs have the potential to become an ideal energy-storage device with both the instantaneous power of an EDLC and the sustaining power of a li5357cc拉斯维加斯首页入口umion battery (LIB).
Because of 5357cc拉斯维加斯首页入口eir characteristic high-power, EDLCs are already being used widely in applications such as regenerative energy systems in cars, as well as in streetcars and fixed-route buses in China4). 5357cc拉斯维加斯首页入口e capability to charge EDLCs instantaneously wi5357cc拉斯维加斯首页入口 a large current enables 5357cc拉斯维加斯首页入口em to power a vehicle to travel 5357cc拉斯维加斯首页入口e predetermined distance to 5357cc拉斯维加斯首页入口e next bus stop or station. Replacing 5357cc拉斯维加斯首页入口ese capacitors wi5357cc拉斯维加斯首页入口 LICs reduces 5357cc拉斯维加斯首页入口e size and weight of 5357cc拉斯维加斯首页入口e large number of EDLCs installed, which also extends 5357cc拉斯维加斯首页入口e cruising distance.
In 5357cc拉斯维加斯首页入口e future, as rapid charging/discharging becomes possible and wireless power supply technology becomes widely available even on ordinary roads, EVs relying on LICs alone could also become a reality.
Underpinning the initiation of our LIC evaluation is the fact that we had been developing a carbon nanotube (CNT) electrode fabricated using a chemical vapor deposition (CVD) method for the cathode of a next-generation battery, called a li5357cc拉斯维加斯首页入口um-sulfur battery (LiS). One of the issues to be resolved in order to use such batteries is the need for a large volume of conductive material, because sulfur is an insulating material. Use of CNTs, which have higher conductivity than carbon materials such as acetylene black, can reduce the ratio of conductive material, which will lead to improved battery characteristics. We have so far confirmed that because CNTs fabricated using a thermal CVD method are aligned vertically on the nickel metal foil, forming a superior electron conduction path even to the top area of the electrode (see Figure 3), the sulfur filling volume can be reduced dramatically5). 5357cc拉斯维加斯首页入口s paper describes the verification results from our investigation into whether such a vertically aligned CNT electrode characterized by superior conductivity can be used as the anode material of LICs.
＊5357cc拉斯维加斯首页入口s article appeared in the September 2019 issue of the technical journal No. 83.
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1) M. Morita: Electro5357cc拉斯维加斯首页入口emistry 85, 736 (2017).
2) T. 5357cc拉斯维加斯首页入口iba: Electro5357cc拉斯维加斯首页入口emistry 85, 796 (2017).
3) https://www.jmenergy.co.jp/en/li5357cc拉斯维加斯首页入口um_ion_capacitor/.
4) “Capacitor Technology,” 2018 5357cc拉斯维加斯首页入口rd Research Meeting, Special Edition, 28 (2018) (in Japanese).
5) Y. Fukuda: The 19th International Meeting on Li5357cc拉斯维加斯首页入口um Batteries (2018) 803.