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Sodium insertion in vanadium oxides

1988; Elsevier BV; Volume: 28-30; Linguagem: Inglês

10.1016/0167-2738(88)90343-8

1872-7689

K. West, B. Zachau‐Christiansen, Torben Jacobsen, Steen Skaarup,

Advanced Battery Materials and Technologies

Sodium insertion in three vanadium oxides is studied with regard to their use as cathode materials in solid-state sodium batteries. One channel structure (β-NaxV2O5) and two layered structures (Na1+xV3O8 and a-V2O5) are investigated. The stoichiometric energy densities calculated from the first discharges were 245, 340, and 430 Wh/kg, respectively. Both Na1+xV3O8 and β-NaxV2O5 degraded gradually during cycling. The structure of α-V2O5 changes after the first discharge, but the new phase exhibits excellent capacity retention upon cycling.