Electrochemical impedance spectroscopy study of lithium–sulfur batteries: Useful technique to reveal the Li/S electrochemical mechanism

Sylwia Waluś (1, 2) , Céline Barchasz (1) , Renaud Bouchet (2) , F. Alloin (3, 2)

1 LITEN - Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux
2 MIEL - Matériaux Interfaces ELectrochimie
3 RS2E - Réseau sur le stockage électrochimique de l'énergie

Electrochemical impedance spectroscopy (EIS) study was done in order to go deeper into the electro- chemical processes of Li/S battery in a common CR2032 coin-type cell. In order to separate the con- tributions of each electrode (i. e. lithium negative electrode and sulfur composite positive electrode), impedance measurements on symmetrical cells consisting of two previously cycled electrodes was used. This methodology enables to propose an overall interpretation of the different electrochemical phenom- ena present during cycling. Low temperature tests were also applied, which brought fruitful information concerning the kinetics of the reactions and allowed to confirm the chemical-physical interpretations performed on the cell cycled at 25 °C.

Mots clés: Lithium-sulfur battery; Electrochemical impedance spectroscopy; Electrochemistry; Equivalent electrical circuit

Domaines: Chimie

Sylwia Waluś, Céline Barchasz, Renaud Bouchet, F. Alloin. Electrochemical impedance spectroscopy study of lithium–sulfur batteries: Useful technique to reveal the Li/S electrochemical mechanism. Electrochimica Acta, 2020, 359, pp.136944. ⟨10.1016/j.electacta.2020.136944⟩. ⟨hal-02925501⟩