V2O5-NiO composite nanowires:a novel and highly efficient carbon-free electrode for non-aqueous Li-air batteries operated in ambient air
会议名称：《中国化学会第三届中国能源材料化学研讨会》
会议日期：2018年
摘 要：Due to the ultra-high theoretical specific capacity and energy density,the non-aqueous Li-air battery has attracted a lot of attention over the past ***,the decomposition of electrode during discharge and charge processes has seriously limited the further development of this ***,we fabricate a novel carbonand binder-free electrode,VO-NiO composite nanowires,via a hydrothermal method associated with a sintering *** this novel electrode,the battery displays an over-potential of as low as 0.56 V and is operated stably for 250 cycles(1000 h) with an energy efficiency of as high as 70% at the current of 250 mA g with a fixed capacity of 500 mAh g in pure *** the current density further increases from 250 to 500 and 750 mA g,the electrode enables the battery to operate stably for 220 and 200 cycles,indicating the excellent cycling stability and rate capability of the VO-NiO composite nanowire in pure ***,in ambient air,the battery with this electrode can still be steadily cycled for as high as 200 times(800 h) at the current density of 250 mA g with a coulombic efficiency of 100% and an energy efficiency of as high as ～68%.Therefore,the VO-NiO composite nanowire offers great promise to replace the carbon electrode and further realize the operation of the truly nonaqueous Li-air battery in ambient air.