Impact of cell-voltage on energy and power performance of supercapacitors with single-walled carbon nanotube electrodes |
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| Authors: | Ali Izadi-Najafabadi Takeo Yamada Don N Futaba Hiroaki Hatori Sumio Iijima Kenji Hata |
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| Institution: | 1. Nanotube Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan 305-8565;2. Project Headquarters, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 2, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan 305-8565;3. Japan Science and Technology Agency (JST) Kawaguchi, Japan 332-0012 |
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| Abstract: | We report the energy and power voltage-dependencies of supercapacitors using single-walled carbon nanotube electrodes. The energy density was dependent on the cell-voltage cubed (up to 4 V: E = 1.43 × V3). The cubic relationship was attributed to the linear increase of the capacitance as a function of voltage, enabled by electrochemical doping. Furthermore, while up to 3.5 V, the maximum power rating of the nanotube electrodes increased as a function of the cell-voltage squared, beyond 3.5 V, a decline in power was observed as a result of depletion of the electrolyte's ions. |
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