Exploring the Low Voltage Behavior of V₂O₅Aerogel as Intercalation Host for Sodium Ion Battery

Boosted by costs benefits, the development of room temperature Na-ion batteries is strongly desired for stationary applications. In this study we explore the possible use of V 2 O 5 aerogel as anode material for sodium ion batteries. The aerogel is able to reversibly insert more than 3 Eq. of sodium in the voltage range 0.1 V–4 V vs. Na/Na + demonstrating to possess additional capacity when cycled to lower voltage. The anode delivers about 200 mAh g −1 in the voltage range 0.01 V–1.5 V vs. Na/Na + . The preliminary characterization of a full Na-ion cell made coupling the V 2 O 5 aerogel anode with carbon-coated Na 3 V 2 (PO 4 ) 3 cathode is also reported. The cell, showing an average voltage of 2.5 V, performed 200 cycles with good efficiency and a maximum specific capacity of 113 mAh per gram of anode material.