Electrochemical stability of steel, Ti, and Cu current collectors in water-in-salt electrolyte for green batteries and supercapacitors

• DOI: 10.1007/s10008-020-04853-2
• Publication Date: 2020-11-09T21:06:13Z
• Authors: Walter Giurlani; Luca Sergi; Eugenio Crestini; Nicola Calisi; Federico Poli; Francesca Soavi; Massimo Innocenti
• Keywords: Chronoamperometry; Electrochemical window

Abstract The electrochemical behaviour of steel, copper, and titanium current collectors was studied in aqueous solutions lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) at various concentrations, from 0.5 up to 20 m. As the concentration electrolyte increases, window water stability widens according “water-in-salt” concept. metal grids have been electrochemically, both under anodic cathodic conditions, by means cyclic voltammetry chronoamperometry. Subsequently, a microscopic analysis with SEM compositional XPS carried out evaluate surface modifications following stress. We found that copper is not very suitable for this kind application, while steel showed interesting large window.