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- W2289356210 abstract "In the presentation, the authors show supercapacitor performances for an asymmetric capacitor based on polyfluorene (PF)/carbon nanotube (CNT) composite materials as a cathode, which are excellent life performance as well as high energy density. We have been electrochemically investigating the PF and its derivatives for advanced capacitor materials because of their potential for high working voltage and high capacitance. Previously, the author reported high capacitance (over 300 F g) of the composite electrodes based on PF and an unique single walled carbon nanotube (SG-SWCNT) which was prepared by a highly efficient CVD process (Super growth process). In this study, we prepared the asymmetric capacitor based on PF/SGSWCNT composite cathode, and investigated its energy and power densities and retention of energy density during DC floating. The asymmetric capacitor test cell based on the PF/SGSWCNT cathode and the SG-SWCNT anode (PF/SGSWCNT capacitor) was fabricated and checked its energy and power densities (Fig. 1). The cell showed better performance in energy density (more than twice higher in mass of electrode) compared with that of pure EDLC test cell based on activated carbon as an anode and a cathode (AC_AC EDLC), and that based on SG-SWCNT (SG_SG EDLC). To verify a life performance of the PF/SGSWCNT capacitor, a DC floating test was carried out. More than 20 Wh kg was retained after the floating time of > 600 hours. Even after the DC floating time around 1000 hours, the PF/SG-SWCNT capacitor exhibited superiority in energy density (Fig. 2) though its capacitance retention was inferior to those for AC_AC and SG_SG EDLCs. Some approaches for further improvement in the capacitance retention and a DC floating test under higher temperature were ongoing and some of the results would be reported in the presentation." @default.
- W2289356210 created "2016-06-24" @default.
- W2289356210 date "2009-01-01" @default.
- W2289356210 modified "2023-09-25" @default.
- W2289356210 title "Excellent Life Performance of an Asymmetric Capacitor Based on Polyfluorene/Carbon Nanotube Composites" @default.
- W2289356210 doi "https://doi.org/10.1149/ma2009-02/5/253" @default.
- W2289356210 hasPublicationYear "2009" @default.
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