Understanding the different (dis)charging steps of supercapacitors: influence of potential and solvation

Clarisse Péan (1, 2, 3) , Benjamin Rotenberg (1, 2) , Patrice Simon (1, 3) , Mathieu Salanne (1, 2, 4)

1 RS2E - Réseau sur le stockage électrochimique de l'énergie
2 PHENIX - PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
4 MDLS - Maison de la Simulation

Supercapacitors are an innovative and promising technology in the field of energy storage. In the present study, we use modeling via computer simulation as a technique to study the dynamic processes of charging and discharging. This methodology is complementary to experiments. Various model systems composed of different structures of carbon electrodes, in contact with either pure or solvated ionic liquid, polarized at positive or negative potentials were investigated. From the data obtained, we identify several characteristic times for the charging mechanism of supercapacitors. Furthermore, we determine the influence of the structure of the electrode material, and the effects of potential and solvation on dynamical processes.

Mots clés: Supercapacitors; Dynamic processes; Molecular dynamics; Porous materials; Solvation

Domaines: Matériaux

Clarisse Péan, Benjamin Rotenberg, Patrice Simon, Mathieu Salanne. Understanding the different (dis)charging steps of supercapacitors: influence of potential and solvation. Electrochimica Acta, 2016, vol. 206, pp. 504-512. ⟨10.1016/j.electacta.2016.02.106⟩. ⟨hal-01473671⟩