High power density aqueous hybrid supercapacitor combining activated carbon and highly conductive spinel cobalt oxide

Gérôme Godillot (1) , Pierre-Louis Taberna (2, 3) , Barbara Daffos (2, 3) , Patrice Simon (2, 3) , Claude Delmas (1) , Liliane Guerlou-Demourgues (1, 3)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 RS2E - Réseau sur le stockage électrochimique de l'énergie

The remarkable electrochemical behavior of complete activated carbon/cobalt oxide cells is reported in the present work. Among the various weight ratios between the positive and negative electrodes evaluated, the best features are obtained with an overcapacitive cobalt oxide electrode. The energy densities obtained by this system (20 Wh kg−1 for a power density of 209 W kg−1) are twice higher than those measured for a activated carbon/activated carbon symmetric cell, in the same operating conditions. With discharge capacities around 62 F g−1, this system is among the best ones reported in the literature for this category.

Mots clés: Spinel; Cobalt oxide; Hybrid supercapacitor; Electrode

Domaines: Matériaux; Matériaux

Gérôme Godillot, Pierre-Louis Taberna, Barbara Daffos, Patrice Simon, Claude Delmas, et al.. High power density aqueous hybrid supercapacitor combining activated carbon and highly conductive spinel cobalt oxide. Journal of Power Sources, 2016, vol. 331, pp. 277-284. ⟨10.1016/j.jpowsour.2016.09.035⟩. ⟨hal-01466061⟩