The electrochemical intercalation of lithium in Ag2V4O11 and Ag2V4O11-y has been performed. We found that 7 and 5.7 lithium ions can respectively be intercalated into these compounds through a multiphase intercalation process. Preliminary electrochemical evaluation of the performances of both vanadates as positive electrode materials for room temperature rechargeable lithium batteries indicates that among the two compounds, the oxygenated Ag2V4O11 phase, with a theoretical specific capacity of 300 Ah/g of vanadate, is the most attractive.