On-chip micro-supercapacitors for operation in a wide temperature range
a, b, c, a, b, c, d, e, f, a, b, c, d,
e, f, c, d
a CNRS, LAAS, 7 avenue du colonel Roche, F-31400 Toulouse, France
b Univ de Toulouse, LAAS, F-31400 Toulouse, France
c Univ Paul Sabatier, CIRIMAT UMR-CNRS 5085, F-31062 Toulouse Cedex 4, France
d Réseau sur le Stockage Electrochimique de l'Energie (RS2E), FR CNRS n°3459, France
e Department of Materials Science Engineering, Drexel University, Philadelphia, PA 19104, USA
f A.J. Drexel Nanotechnology Institute, Drexel University, Philadelphia, PA 19104, USA
Onion-like carbon (OLC) based micro-supercapacitor electrodes prepared by electrophoretic deposition (EPD) were combined with a eutectic mixture of ionic liquids (IL), producing a micro-supercapacitor which is able to function from − 50 °C to 80 °C. This device was electrochemically characterized by cyclic voltammetry and electrochemical impedance spectroscopy at different scan rates and different temperatures.
Picture (at left ) shows: a) Schematic picture of on-chip micro-supercapacitor with OLC as electrode material prepared by EPD and b) microscopic picture.
At 20 °C, a capacitance of 1.1 mF.cm− 2 per footprint area of device at 200 mV.s− 1 within 3.7 V was measured, hence a specific energy of 15 mJ.cm− 2 and a specific power of 240 mW.cm− 2. At − 50 °C, 76% of the capacitance was maintained at 10 mV.s− 1 within 3.7 V.By integrating with IL, this micro-supercapacitor can be potentially used in portable electronic devices that are required to work under temperature extremes.
- • Micro-supercapacitor fabrication using ionic liquid mixture as electrolyte
- • Micro-supercapacitor with large voltage window (3.7 V at room temperature)
- • Micro-supercapacitor with large operation temperature (− 50 °C to + 80 °C)
Keywords: Micro-supercapacitors; Ionic liquid electrolyte; Large voltage window; Large operation temperature
On-chip micro-supercapacitors for operation in a wide temperature range. Peihua Huang, David Pech, Rongying Lin, John K McDonough, Magali Brunet, Pierre-Louis Taberna, Yury Gogotsi, Patrice Simon. Electrochemistry Communications, Volume 36, November 2013, Pages 53–56.