The Roles of V₂O₅and Stainless Steel in Rechargeable Al–Ion Batteries

Electrochemical cells based on a V 2 O 5 composite cathode, aluminum anode, and AlCl 3 + 1-ethyl-3-methylimidazolium chloride ionic liquid electrolyte were prepared and characterized to ascertain the role of V 2 O 5 . The V 2 O 5 was found to be electrochemically inactive in a potential window of 5 mV to 1.5 V vs. Al/Al 3+ . The electrochemical behavior of the cells was found to be independent of the V 2 O 5 and depend entirely on the stainless steel used as a current collector, thus showing stainless steel and V 2 O 5 to be of limited use in this electrolyte.