Electrochemical characterization of Ti3C2T MXene prepared via a molten salt etching route in an acetonitrile-based electrolyte

Liyuan Liu (1, 2) , Encarnacion Raymundo-Piñero (3) , Pierre-Louis Taberna (1) , Patrice Simon (1, 2)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 RS2E - Réseau sur le stockage électrochimique de l'énergie
3 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation

Two-dimensional metal carbide and nitride materials (MXenes) with controlled Cl-and O-surface terminations (MS-Ti 3 C 2 T x) were prepared by a molten salt etching route and their electrochemical properties were investigated in nitrile-based electrolytes. The results show that the power performance of MS-Ti 3 C 2 T x was greatly improved in acetonitrile (ACN)-based non-aqueous organic electrolytes, which are conventional electrolytes for electrochemical capacitors. The addition of a lithium salt to produce 2 M LiTFSI in ACN results in an increase in the specific capacitance. Moreover, replacing LiTFSI by LiFSI drastically improves the power performance of MXenes at a high scan rate (95 mAh g − 1 at 900C). These results highlight the importance of properly matching the electrolyte composition to the electrode material and shed light on MXenes as high-rate electrode materials for energy storage applications.

Mots clés: Ti3C2Tx MXene; Molten salts approach; Acetonitrile; Surface termination; Li-ion battery

Domaines: Matériaux

Liyuan Liu, Encarnacion Raymundo-Piñero, Pierre-Louis Taberna, Patrice Simon. Electrochemical characterization of Ti3C2T MXene prepared via a molten salt etching route in an acetonitrile-based electrolyte. Electrochemistry Communications, 2023, 148, pp.107453. ⟨10.1016/j.elecom.2023.107453⟩. ⟨hal-04250910v2⟩