Doped vanadium oxides as host materials for lithium intercalation

Doped vanadium pentoxides with a doping ratio M/V (M = Ag and Cu) ranging from 0.01 to 0.5 were synthesized. With the successful doping, the electronic conductivity of V₂O₅ was increased by two to three orders of magnitude. The electrochemical performance of the doped materials is very high. Up to 4 moles of lithium per mole of doped V₂O₅ were found to be reversibly intercalated. The composite cathodes containing the doped materials also showed very high intercalation rate performance. In addition, copper-doped V₂O₅ cathodes showed excellent reversibility upon cycling with no capacity fading after more than 450 cycles.