On-chip micro-supercapacitors for operation in a wide temperature range

Peihua Huang^a^,^b^,^c, David Pech^a^,^b, Rongying Lin^c^,^d, John K. McDonough^e^,^f, Magali Brunet^a^,^b, Pierre-Louis Taberna^c^,^d,

Yury Gogotsi^e^,^f, Patrice Simon^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

Abstract

Onion-like carbon (OLC) based micro-supercapacitor electrodes prepared by electrophoretic deposition (EPD) were combined with a eutectic mixture of ionic liquids (IL), a) Schematic picture of on-chip micro-supercapacitor with OLC as electrode material prepared by EPD and b) microscopic picture. 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.

Highlights

• 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.