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

Springer Science and Business Media LLC - Tập 26 - Trang 85-95 - 2020
Walter Giurlani1, Luca Sergi1, Eugenio Crestini1, Nicola Calisi1, Federico Poli2, Francesca Soavi2, Massimo Innocenti1
1Department of Chemistry “Ugo Schiff”, Università degli Studi di Firenze, Sesto Fiorentino, Italy
2Dipartimento di Chimica “Giacomo Ciamician”, Alma Mater Studiorum Università di Bologna, Bologna, Italy

Tóm tắt

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

Tài liệu tham khảo

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