Impact of the surface roughness on the electrical capacitance

Audrey Albina (1) , Pierre-Louis Taberna (2) , Jean-Pascal Cambronne (1) , Patrice Simon (2) , Emmanuel Flahaut (2) , Thierry Lebey (1)

1 LGET - Laboratoire de génie électrique de Toulouse
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

A new hybrid approach consists to use the advantages of both systems namely the high geometric aspects of the electrodes of the ultracapacitor and the high dielectric strength of polymer materials used in dielectric capacitors. The surface roughness of the electrodes of the ultracapacitor is manufactured with nano-porous materials; activated carbon and carbon nanotubes (CNTs). Many compositions of both carbonaceous materials are tested with different insulating materials (liquid and solid) to constitute the hybrid capacitor. It appears that the capacitance increases with the carbonaceous composition: An increasing from 15 to 40% is observed as compared to a plane capacitor, it can be twice with a 100 wt% of CNTs content. But, the impregnation of the insulating material in the surface roughness remains the key point of the realization of the hybrid capacitor. The roughness accessibility is a major property to optimize in order to improve the impregnation of the insulating material to increase the electrical capacitance.

Mots clés: Dielectric capacitor; Surface roughness; Activated carbon; Carbon nanotubes; Roughness accessibility; Dielectric capacitor

Domaines: Matériaux

Audrey Albina, Pierre-Louis Taberna, Jean-Pascal Cambronne, Patrice Simon, Emmanuel Flahaut, et al.. Impact of the surface roughness on the electrical capacitance. Microelectronics Journal, 2006, 37 (8), pp.752-758. ⟨10.1016/j.mejo.2005.10.008⟩. ⟨hal-03599346⟩