A supercapacitor constructed with a partially graphitized porous carbon and its performance over a wide working temperature range?

Journal of Materials Chemistry A Pub Date: 2015-07-14 DOI: 10.1039/C5TA04581A

Abstract

A supercapacitor that possesses excellent performance in a wide temperature range is constructed with a partially graphitized porous carbon (PGPC) as the electrode material and tetraethylammonium tetrafluoroborate/propylene carbonate (Et4NBF4/PC) as the electrolyte. The PGPC-based electrode shows a very consistent performance in a wide temperature range of ?20 to 50 °C. At working temperatures as high as 50 °C and as low as ?20 °C, it delivers specific capacitances of ～148 and ～135 F g?1, respectively, and the supercapacitors exhibit high energy densities of ～46 and ～43 W h kg?1. In particular, the low-temperature capacitive performance and rate capability of PGPC are much better than those of the normally used activated carbon and among the best ones ever-reported for carbon-based supercapacitors. More significantly, the PGPC-based supercapacitor shows excellent cycling performance at all tested working temperatures, with a capacitance retention of ～98% after 1000 cycles at 5 A g?1 even when the working temperature decreases to ?20 °C.

Graphical abstract: A supercapacitor constructed with a partially graphitized porous carbon and its performance over a wide working temperature range
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