Thermal influence on the electrochemical behavior of a supercapacitor containing an ionic liquid electrolyte
Journal article, 2018

Emerging demands on heat-durable electronics have accelerated the need for high temperature supercapacitors as well as for understanding the influence of elevated temperatures on the capacitive behavior. In this work, we present a comprehensive study of the thermal influence on a supercapacitor containing 1-ethyl-3-methylimidazolium acetate (EMIM Ac) electrolyte and activated carbon (AC) electrodes. The performance variation as a function of temperature in a range from 21 °C to 150 °C reveals that a high specific capacitance of 142 F g−1 can be achieved at 150 °C at a current density of 2 A g−1 with a rate capability of 87% at 15 A g−1 (relative to 2 A g−1). At 150 °C, equivalent series resistance (ESR) is only 0.37 Ω cm2, which is a result of improved ionic conductivity of the electrolyte at elevated temperature. The ESR value of 2.5 Ω cm2 at room temperature reflects a good compatibility between EMIM Ac and AC. In addition, a capacitance retention of more than 95% (in the end of 1000 cycles) is maintained up to120 °C followed by 85% at 150 °C. These results confirm EMIM Ac as a suitable candidate for carbon-based high temperature supercapacitors, and the observations regarding the thermal influence on performance metrics e.g. usable operation voltage could be applicable to other energy storage devices.


Mohammad Mazharul Haque

Electronics Material and Systems

Qi Li

Chalmers, Microtechnology and Nanoscience (MC2)

Anderson David Smith

Electronics Material and Systems

Volodymyr Kuzmenko

Electronics Material and Systems

Elof Köhler

Electronics Material and Systems

Per Lundgren

Electronics Material and Systems

Peter Enoksson

Electronics Material and Systems

Electrochimica Acta

0013-4686 (ISSN)

Areas of Advance


Materials Science

Subject Categories

Chemical Sciences