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Acetonitrile‐Based Electrolytes for Rechargeable Zinc Batteries
Author(s) -
Etman Ahmed S.,
Carboni Marco,
Sun Junliang,
Younesi Reza
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000358
Subject(s) - tin , electrolyte , stripping (fiber) , foil method , plating (geology) , materials science , zinc , anode , inorganic chemistry , titanium , chemistry , analytical chemistry (journal) , metallurgy , electrode , composite material , chromatography , geophysics , geology
Herein, Zn plating–stripping onto metallic Zn using a couple of acetonitrile (AN)‐based electrolytes (0.5 m Zn(TFSI) 2 /AN and 0.5 m Zn(CF 3 SO 3 ) 2 /AN) is studied. Both electrolytes show a reversible Zn plating/stripping over 1000 cycles at different applied current densities varying from 1.25 to 10 mA cm −2 . The overpotentials of Zn plating–stripping over 500 cycles at constant current of 1.25 and 10 mA cm −2 are ±0.05 and ±0.2 V, respectively. X‐ray photoelectron spectroscopy analysis reveals that no decomposition product is formed on the Zn surface. The anodic stability of four different current collectors of aluminum foil (Al), carbon‐coated aluminum foil (C/Al), TiN‐coated titanium foil (TiN/Ti), and multiwalled carbon nanotube paper (MWCNT‐paper) is tested in both electrolytes. As a general trend, the current collectors have a higher anodic stability in Zn(TFSI) 2 /AN compared with Zn(CF 3 SO 3 ) 2 /AN. The Al foil displays the highest anodic stability of ≈2.25 V versus Zn 2+ /Zn in Zn(TFSI) 2 /AN electrolyte. The TiN/Ti shows a comparable anodic stability with that of Al foil, but its anodic current density is higher than Al. The promising reversibility of the Zn plating/stripping combined with the anodic stability of Al and TiN/Ti current collectors paves the way for establishing highly reversible Zn‐ion batteries.