Development of anode of high performance lithium ion capacitors using single-walled carbon nanotube thin films

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We investigated the properties of lithium ion capacitors (LICs) using highly crystalline single-walled carbon nanotube (SWCNT) thin films with carboxyl groups as an anode. The decrease of the capacity of LICs was suppressed at a high rate, and also the decrease of the capacitance and the increase of the internal resistance were suppressed at overcharging voltages. If the capacitance of SWCNTs is large, we can fabricate a high performance LICs. In contrast, the properties of the LICs decrease at over-discharging voltages. In the future, we need to clarify phenomena caused in SWCNT electrodes in over-discharging.We synthesized ethylenediaminated SWCNTs (EDA-SWCNTs) from fluorinated SWCNTs and investigated the properties of electric double-layer supercapacitors (EDLSCs) with EDA-SWCNTs as electrodes. Free-standing EDA-SWCNT electrodes for EDLSCs are effective as electrodes and improve the properties of EDLSCs in comparison to binder-free COOH-SWCNT electrodes.