High discharge capacity of VB2-Ni as anode for VB2/air battery

Abstract

Abstract. The compound powders of VB 2 with 25 wt% and 50 wt% Ni were mixed uniformly using a planetary ball miller, respectively. The discharge capacity of VB 2 /air battery with VB 2 -Ni as anode in KOH electrolyte was investigated at room temperature and ambient pressure. Meanwhile, the microstructure of VB 2 -Ni anode before and after discharge were analyzed by scanning electron microscope (SEM).The results indicate that the sintered anode material of VB 2 with 25 wt% Ni has the highest discharge capacity. Moreover, the discharge capacity of VB 2 /air battery reached 7574 mAh with sintered VB 2 -Ni25wt% anode, which was much higher than that with unsintered VB 2 -Ni25wt% anode. However, the discharge capacity of VB 2 /air battery with sintered VB 2 -Ni50wt% anode was much lower than that with unsintered VB 2 -Ni50wt% anode. The VB 2 -Ni25wt% anode sintered at 1050 o C for 30 min is an effective way to improve the discharge capacity of VB 2 /air battery.