Long-term cycling behavior of asymmetric activated carbon/MnO2 aqueous electrochemical supercapacitor

Thierry Brousse (1) , Pierre-Louis. Taberna (2) , Olivier Crosnier (1) , Romain Dugas (1) , Philippe Guillemet (1) , Yves Scudeller (1) , Frédéric Favier (3) , Yingke K. Zhou (3) , Daniel Bélanger (4) , Patrice Simon (2)

1 LGMPA - Laboratoire de Génie des Matériaux et Procédés Associés
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
4 Département de Chimie [Montréal]

Activated carbon–MnO2 hybrid electrochemical supercapacitor cells have been assembled and characterized in K2SO4 aqueous media. A laboratory cell achieved 195,000 cycles with stable performance. The maximal cell voltage was 2V associated with 21±2Fg−1 of total composite electrode materials (including activated carbon andMnO2, binder and conductive additive) and an equivalent serie resistance (ESR) below1.3cm2. Long-life cycling was achieved by removing dissolved oxygen from the electrolyte, which limits the corrosion of current collectors. Scaling up has been realized by assembling several electrodes in parallel to build a prismatic cell. A stable capacity of 380 F and a cell voltage of 2V were maintained over 600 cycles. These encouraging results show the interest of developing such devices, including non-toxic and safer components as compared to the current organic-based devices.

Mots clés: Electrochemical capacitor; Electrochemical capacitor; Asymmetric device; MnO2; Activated carbon; Supercapacitor

Domaines: Matériaux

Thierry Brousse, Pierre-Louis. Taberna, Olivier Crosnier, Romain Dugas, Philippe Guillemet, et al.. Long-term cycling behavior of asymmetric activated carbon/MnO2 aqueous electrochemical supercapacitor. Journal of Power Sources, 2007, 173 (1), pp.633-641. ⟨10.1016/j.jpowsour.2007.04.074⟩. ⟨hal-00186697⟩